01473 820850 celotex.co.uk The Celotex Handy Guide · 76 Timber frame wall lining and dormer cheeks...

The CelotexHandy Guide

Celotex. Whatever the weather

celotex.co.uk01473 820850

Celotex. Help is always at hand

Whatever the project, whatever the size, Celotex’ technical consultants can provide all the help and advice you need to specify

Celotex products with confi dence.

You can also visit us online at celotex.co.uk where you can view our full suite of literature and use our popular U-value calculator, which,

with our award winning App can now be downloaded straight to your phone.

With industry leading products and the broadest range of PIR insulation available, Celotex ensures you can achieve better U-values

and thinner solutions.

To fi nd out more google ‘insulation specialists’


T: 01473 820850 | celotex.co.uk | 3

04 ▶ Carbon reduction programmes

06 ▶ Celotex

08 ▶ Product descriptions

17 ▶ New build insulation solutions

18 ▶ Insulation solutions for fl oors

20 Calculating the P/A ratio

22 Concrete slab fl oors

24 Beam and block fl oors

26 Underfl oor heating

28 Concrete soffi t fl oors

30 ▶ Insulation solutions for walls

32 Masonry cavity walls

34 Blockwork comparison list

36 Masonry cavity walls with plasterboard laminate

38 Timber frame wall lining

40 Timber frame wall sheathing

42 Steel stud framed walls

44 Rainscreen cladding

46 ▶ Insulation solutions for pitched roofs

48 Pitched roof sarking

50 Insulation between and over rafters

52 Insulation between rafters

54 Insulation between and under rafters

56 ▶ Insulation solutions for fl at roofs

58 Built-up fl at roofi ng applications

60 Single-ply membrane using Celotex EL3000

62 Single-ply membrane using Celotex TA4000

65 ▶ Refurbishment insulation solutions

66 Suspended timber fl oors

68 Upgrading concrete slab fl oors

70 Top up cavity walls

72 Upgrading internal solid walls

74 Upgrading external solid walls

76 Timber frame wall lining and dormer cheeks

78 Pitched roof upgrades

80 Insulating at ceiling level

82 Flat roof upgrades

84 Flat roof insulating deck

86 Basements

88 Loft conversions

90 Garage conversions

93 ▶ General information

Contents

4 | T: 01473 820850 | celotex.co.uk

The UK continue to lead the global drive towards

carbon emission reduction. The UK Climate Change

Act with a legally binding reduction target of 80% by

2050 is the key driver for today’s UK carbon reduction

programmes. Many schemes are now integrated into

the UK built environment calling for improved energy

effi cient homes and buildings.

UK Building Regulations

Part L and Section 6 2010 call for a carbon emission

reduction of 25% and 30% respectively. Whilst

compliance is calculated through a whole building

calculation and a variety of diff erent measures, it

is widely acknowledged that compliance will only

be achieved by delivering high levels of thermal

performance within the building fabric.

Celotex with lambda values as low as 0.021W/mK

achieve better U-values and thinner solutions

preventing heat loss and maximising thermal

performance. With a premium range including ‘best

in class’ product solutions for pitched and fl at roofs,

walls and fl oors Celotex will continue to help meet the

requirements of Building Regulations. Typically this will

be achieved with a thinner build up than many other

insulation options.

Please see page 5 for information regarding

Celotex’ recommended U-values to meet the fabric

requirements of Part L & Section 6.

Green Deal & Energy Company Obligation

2013 sees the launch of the Government’s fl agship

Green Deal programme. Green Deal off ers

homeowners as well as businesses the opportunity

to apply for up-front fi nance to install energy effi cient

measures.

Alongside this, the new Energy Company Obligation

(ECO) will provide extra fi nancial assistance for priority

groups and householders in older properties. ECO

fi nance will be provided by major energy suppliers.

With up to seven million solid wall properties requiring

insulation upgrades, ECO will see an increase in the

level of solid wall measures which have not benefi tted

as much from previous CERT and CESP schemes.

Celotex plasterboard thermal laminates including

Celotex PL4000 are accredited with BBA certifi cation

and Ofgem approval confi rming their use as an

allowable measure for Green Deal & ECO. These

industry leading approvals underline Celotex’ position

as a value added diff erentiator within the PIR

insulation category.

Carbon reduction programmes

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England and Wales Approved Document L1A (2010) – new dwellings. Elemental U-values – indicative only For regulation compliance, new dwellings must

achieve a CO2 Target Emissions Rate (TER). This is

unique to each dwelling design and is calculated

using Standard Assessment Procedure (SAP) 2009.

The TER is more easily achieved by specifying

high standards of fabric insulation, resulting in

low U-values.

The U-values shown indicate the standard of

insulation required to meet typical dwelling TERs

and are given for guidance purposes only.

England and Wales Approved Document L1B (2010) – existing dwellings. Elemental U-valuesUnder the new regulations existing dwellings do

not have to meet a TER. Instead, they have to meet

so called ‘elemental U-values’ which refer to target

fi gures for individual fl oor, wall and roof elements of

the building.

These values are shown in the illustration to the right.

Scotland Domestic Technical Handbook – Section 6: Energy.Elemental U-valuesUnder the Scottish regulations, dwellings do not

have to meet a target TER (unless requested by

local authority). Instead, they have to meet so called

‘elemental U-values’ which refer to target fi gures

for individual fl oor, wall and roof elements of

the building.

These values are shown in the illustration to the right.

0.13 - 0.15

0.13 - 0.15

0.13 - 0.15

0.15 - 0.20

0.20-

0.250.20

- 0.25

unheatedspace

loft

0.15 - 0.20

0.18

new extension

unheatedspace

existing dwelling

unheatedspace

0.16

0.18

0.16

0.25

loft

0.250.30

0.28

0.220.30

0.13

0.13

0.19

0.19 unheatedspace

loft

0.130.19

0.15

0.15

6 | T: 01473 820850 | celotex.co.uk

With over 80 years as the insulation specialists, Celotex

with its extensive product range, leading technical and

manufacturing expertise and high levels of customer

service, remain the brand leading provider of PIR

insulation.

We remain focused and committed to insulation

innovation as well as enhancing our products and

services to help meet the requirements of Part L 2010

and other carbon reduction programmes.

Why Celotex PIR?

As a leading investor within the insulation sector,

Celotex PIR has a considerable advantage over many

other insulation providers. This is refl ected through our

high performance insulation solutions.

Celotex PIR insulation off ers:

▶ Products with a thermal conductivity as low as

0.021W/mK off ering even better U-values and some

of the thinnest possible solutions

▶ Celotex IQ providing super low emissivity

values within cavity air spaces

▶ Better thermal effi ciency per mm than many

other insulation materials

▶ An A+ rating when compared to the BRE

Green Guide

▶ A lower environmental impact than other

typical PIR manufacturers

▶ Products with Class O fi re performance

▶ Solutions for both internal and external solid

wall upgrades with Celotex PL4000 and SW3000

▶ The broadest range of PIR thicknesses from

12mm to 200mm

▶ An expansive product range suitable for

pitched and fl at roofs, walls and fl oors

▶ Product solutions for both new build

and refurbishment projects

▶ Industry leading technical support via the

Celotex Technical Centre

Celotex product range

As part of our process for continuous product

improvement, we have yet again broken through the

technology barrier.

Celotex off ers a premium performance solution

through Celotex FR5000, which off ers a super low

lambda value of 0.021W/mK, an A+ rating when

compared to the BRE Green Guide and Class O

fi re performance throughout the entire product.

Featuring Celotex IQ providing super low emissivity

values, Celotex FR5000 delivers some of the highest

performing rigid board insulation solutions.

Celotex SW3000 also provides the perfect solution

for the upgrade of external solid walls, off ering an

innovative way of meeting regulation targets.

Celotex off ers the broadest range of product

thicknesses from 12mm to 200mm as well as specialist

product solutions for cavity wall, underfl oor heating,

dry lining, concrete soffi t fl oor and fl at roofi ng

applications. Our products provide new and innovative

solutions for new build and refurbishment projects.

Further information on all Celotex products can

be found from page 8. Or why not download the

information from the Celotex website? Product and

application literature is available free of charge. The

site contains the popular on-line U-value calculator

which you can now download straight to your phone

with our award winning mobile App. Whatever your

requirement, you’ll fi nd everything you need from

the insulation specialists.

The Celotex

Celotex

T: 01473 820850 | celotex.co.uk | 7

Technical Centre

With outstanding levels of technical expertise and

personal assistance, the Celotex Technical Centre will

provide you with all of the guidance and support you

need when specifying and installing Celotex products.

The Centre is on hand to provide assistance on any of

the following matters:

▶ Part L 2010 and Section 6

▶ Green Deal and ECO

▶ Code for Sustainable Homes and BREEAM

▶ U-value calculations

▶ Application and installation guidance

▶ Condensation risk analysis

▶ Technical approvals

▶ Environmental and sustainability credentials

To provide the maximum level of assistance, the

Celotex Technical Centre is open from 8am to 5.15pm.

For further information on any of the services contact

the Centre via celotex.co.uk or call 01473 820850

Third party approvals

Celotex recognises the importance of gaining third

party approvals, which off er customers independent

verifi cation that our products comply with the relevant

Building Regulations and product standards within the

construction industry. Celotex has gained the following

approvals:

▶ BBA

▶ ISO 14001

▶ ISO 9001

▶ BRE A+ rated

▶ Ofgem

▶ Energy Saving Trust Recommended

SAP calculations

SAP is the Government’s Standard Assessment

Procedure for calculating a dwelling’s energy rating.

SAP is a compulsory element of Part L 2010, meaning

that all new homes are required to have a SAP rating.

SAP is a whole house energy calculation and looks at

the size of the property, type and size of doors and

windows and the provision of heating, lighting and

hot water.

SAP is used to produce an Energy Performance

Certifi cate (EPC) for a new home. These are required by

law to be provided to owners or tenants of new homes.

Energy Performance Certifi cates (EPCs)

EPCs record how energy effi cient a property is as a

building and provide performance ratings from A-G.

EPCs are issued after the property is built, and are

produced using standard methods and assumptions

about energy usage so one building can be directly

compared with another of the same type. This allows

prospective occupiers to consider energy effi ciency

and fuel costs before committing to a property. EPCs

are legally required for all homes, whenever they are

built, rented or sold. As legal documents, EPCs can only

be produced by accredited energy assessors.

8 | T: 01473 820850 | celotex.co.uk

Product descriptions

Celotex FR5000

Celotex FR5000 is our best in class PIR solution. With

a super low lambda of 0.021 W/mK and Class O fi re

performance throughout the entire product, FR5000

provides an ideal option for achieving better U-values

and thinner solutions in pitched roof, wall and fl oor

applications.


values, Celotex FR5000 delivers high performance

insulation that is over 100% more thermally effi cient

than many mineral fi bre products. FR5000 achieves

an A+ rating when compared to the BRE Green Guide

delivering over 15% better environmental impact than

typical PIR.

Always install Celotex FR5000 in accordance with the

instructions supplied by Celotex.

Lambda0.021 W/mK

Board size1200 x 2400mm

Fire performanceClass O in accordance with BS 476 Parts 6 & 7

BBA certifi cates 95/3197 & 09/4667

BRE Green Guide ratingA+

Celotex CG5000

Celotex CG5000 is our best in class PIR solution

designed specifi cally for partial fi ll cavity wall

applications. CG5000 off ers a super low lambda of

0.021 W/mK delivering high performance insulation

that is over 100% more thermally effi cient than many

mineral fi bre products.


values, Celotex CG5000 off ers enhanced thermal

performance in cavity air spaces. As insulation

specialists pioneering thermal improvements in

PIR, CG5000 has been developed with Class O fi re

performance throughout the entire product and

achieves an A+ rating when compared to the BRE

Green Guide.

Always install Celotex CG5000 in accordance with the


Lambda0.021 W/mK


Fire performanceClass O in accordance with BS 476 Parts 6 & 7

BBA certifi cate94/3080


Product range Product code Thickness (mm) R-value (m2K/W)

CG5041 41 1.95

CG5047 47 2.20

CG5050 50 2.35

CG5060 60 2.85

CG5070 70 3.30

CG5075 75 3.55

CG5085 85 4.00

CG5100 100 4.75


FR5025 25 1.15

FR5040 40 1.90

FR5050 50 2.35

FR5060 60 2.85

FR5070 70 3.30

FR5075 75 3.55

FR5080 80 3.80

FR5090 90 4.25

FR5100 100 4.75

FR5120 120 5.70

FR5150 150 7.10

Look out for the playing card symbol for applications where Celotex FR5000 and CG5000 can be used.FR5000

Look out for the IQ symbol for applications where Celotex IQ is relevant.

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Celotex TB4000

With a breadth of thickness range unrivalled by any

other PIR manufacturer, Celotex TB4000 off ers high

performance insulation available from as thin as 12mm.

TB4000 can be used for overcoming thermal bridging

and for use in two layer build ups including between

and under rafters and over stud in timber frame wall

lining applications.

High performance insulation featuring low emissivity

foil facings and supported by BBA certifi cates, Celotex

TB4000 is suitable for a range of roof, wall and fl oor

applications. TB4000 also achieves an A+ rating when

compared to the BRE Green Guide.

Always install Celotex TB4000 in accordance with the


Lambda0.022 W/mK


Fire performanceClass 1 in accordance with BS 476 Part 7

BBA certifi cates95/3197 & 09/4667


Celotex GA4000

Celotex GA4000 has long been at the heart of Celotex’

product range. High performance insulation featuring

low emissivity foil facings and supported by BBA

certifi cation, GA4000 is suitable for a range of roof, wall

and fl oor applications.

Celotex GA4000 achieves an A+ rating when compared

to the BRE Green Guide and off ers enhanced thermal

performance in cavity air spaces such as timber

frame walls and in between and under pitched roof

applications.

Always install Celotex GA4000 in accordance with the



TB4012 12 0.50

TB4020 20 0.90

TB4025 25 1.10

TB4030 30 1.35

TB4035 35 1.55

TB4040 40 1.80

TB4045 45 2.00


GA4050 50 2.25

GA4055 55 2.50

GA4060 60 2.70

GA4065 65 2.95

GA4070 70 3.15

GA4075 75 3.40

GA4080 80 3.60

GA4085 85 3.85

GA4090 90 4.05

GA4100 100 4.50

Lambda0.022 W/mK


Fire performanceClass 1 in accordance with BS 476 Part 7 (50 to 90mm only)



10 | T: 01473 820850 | celotex.co.uk

Celotex XR4000

Celotex XR4000 is a multi purpose insulation board

enabling users to achieve lower U-values with a

single layer of insulation than has previously been

possible. Our 200mm thick product positions Celotex

as the manufacturer of the broadest range of product

thicknesses from 12mm-200mm.

Celotex XR4000 helps meet current and future building

regulations and carbon reduction programmes

including Part L and Section 6 and is supported by BBA

certifi cation.

Always install Celotex XR4000 in accordance with the


Lambda0.022 W/mK



Celotex CW4000

Celotex CW4000 provides a simple solution for partial

fi ll cavity walls. High performance insulation featuring

low emissivity foil facings, CW4000 off ers enhanced

thermal performance in cavity air spaces compared to

typical PIR solutions. These enhanced values deliver

thinner solutions to meet popular target U-values.

Celotex CW4000 is supported by BBA certifi cation,

achieves an A+ rating when compared to the BRE

Green Guide and is Energy Saving Trust recommended.

Always install Celotex CW4000 in accordance with the


Lambda0.022 W/mK

Board size1200 X 450mm

Fire performanceClass 1 in accordance with BS 476 Part 7

(25 to 90mm only)




XR4110 110 5.00

XR4120 120 5.45

XR4130 130 5.90

XR4140 140 6.35

XR4150 150 6.80

XR4165 165 7.50

XR4200 200 9.05


CW4025 25 1.10

CW4040 40 1.80

CW4050 50 2.25

CW4055 55 2.50

CW4060 60 2.70

CW4065 65 2.95

CW4070 70 3.15

CW4075 75 3.40

CW4080 80 3.60

CW4085 85 3.85

CW4090 90 4.05

CW4100 100 4.50


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Celotex PL4000

Celotex PL4000 comprises high performance PIR

insulation bonded to tapered edge plasterboard.

Available in a broad range of insulation thicknesses as

thin as 15mm, PL4000 allows the user to install both the

insulation and plasterboard in one operation thereby

reducing installation times.

Supported by BBA certifi cation and Ofgem approval,

Celotex PL4000 is the perfect solution for internal

solid wall upgrades and is certifi ed for the broadest

range of installation techniques including direct

bonding (‘dot & dab’). PL4000 can also be used as the

underneath layer of insulation in pitched and fl at roof

between and under applications in both new build and

refurbishment projects.

Always install Celotex PL4000 in accordance with the


Lambda0.022 W/mK


Fire performanceEuroclass B-s1,d0 in accordance with BS EN 13501-1


Celotex SW3000

Celotex SW3000 is the perfect solution for the thermal

upgrade of external solid walls. It provides a quick and

easy way to achieve high thermal performance in solid

wall constructions where no insulation currently exists

An innovative way of meeting the regulation targets

for your refurbishment project, Celotex SW3000 is

approved by a range of external wall render providers.

SW3000 with a mineral coated glass tissue facer acts

as a direct render insulation solution providing thinner

solutions than other insulation materials including

mineral fi bre and EPS.

Always install Celotex SW3000 in accordance with the


Lambda0.027 W/mK for thicknesses under 80mm

0.026 W/mK for thicknesses from 80 to 119mm


Product range Combined Product code Thickness (mm) R-value (m2K/W)

PL4015 15 + 9.5 0.70

PL4025 25 + 12.5 1.20

PL4040 40 + 12.5 1.85

PL4045 45 + 12.5 2.10 PL4050 50 + 12.5 2.30

PL4055 55 + 12.5 2.55

PL4060 60 + 12.5 2.75

PL4065 65 + 12.5 3.00


SW3050 50 1.85

SW3080 80 3.05

SW3100 100 3.80

12 | T: 01473 820850 | celotex.co.uk

Celotex TC3000

Celotex TC3000 is a purpose designed insulation

board for use within built-up fl at roofi ng applications

including hot applied bituminous, mastic asphalting

and torch-on systems. It provides a quick and easy way

to achieve high thermal performance in fl at roofi ng

structures.

Celotex TC3000 features bitumen polypropylene

fl eece facers on both sides and is available in an easy

to handle board size and a range of thicknesses from

50mm to 150mm delivering better U-values and

thinner solutions.

Always install Celotex TC3000 in accordance with the



0.026 W/mK for thicknesses from 80mm to 119mm

0.025 W/mK for thicknesses of 120mm and over


Celotex EL3000

Celotex EL3000 is a purpose designed insulation

board for use in built up fl at roofi ng applications,

including hot applied bituminous and mastic asphalt

waterproofi ng systems and fully adhered single ply

membranes.

Celotex EL3000 features a coated glass tissue facer,

perforated on one side for use in bitumen based built

up applications, whilst the reverse unperforated facer is

suitable for single ply membrane applications. EL3000

is available in a range of thicknesses from 50mm

to 150mm delivering better U-values and thinner

solutions.

Always install Celotex EL3000 in accordance with the



0.026 W/mK for thicknesses from 80 to 119mm

0.025 W/mK for thicknesses of 120mm and over


1200 x 2400mm (120mm only)


EL3050 50 1.85

EL3080 80 3.05

EL3090 90 3.45

EL3100 100 3.80

EL3120 120 4.80

EL3130 130 5.20

EL3140 140 5.60

EL3150 150 6.00



TC3050 50 1.85

TC3090 90 3.45

TC3100 100 3.80

TC3120 120 4.80

TC3130 130 5.20

TC3140 140 5.60

TC3150 150 6.00

T: 01473 820850 | celotex.co.uk | 13

Celotex TA4000

Celotex TA4000 is a purpose designed fl at roofi ng

insulation board for use with mechanically fi xed and

ballasted single ply weathering systems. It provides

a quick and easy way to achieve high thermal

performance in fl at roofi ng structures.

Celotex TA4000 performs to a compressive strength of

150 kPa giving improved resistance to site traffi c during

installation and is available in a range of thicknesses

from 50mm to 140mm delivering better U-values and

thinner solutions.

Always install Celotex TA4000 in accordance with the


Lambda0.022 W/mK


Celotex TD4000

Celotex TD4000 provides a quick and easy way to

achieve eff ective thermally insulated roof decks for

building structures such as small extensions or garage

roofs where there will be only occasional traffi cking.

Celotex TD4000 comprises high performance insulation

bonded to 5.5mm WBP ply. This allows the user to

install the roof structure in one operation since the

product provides the deck, insulation and vapour

control layer thereby considerably reducing installation

times ahead of weatherproofi ng.

Always install Celotex TD4000 in accordance with the


Lambda0.022 W/mK


Product range Combined Product code Thickness (mm) R-value (m2K/W)

TD4096 90 + 5.5 4.10

TD4106 100 + 5.5 4.55

TD4116 110 + 5.5 5.00

TD4126 120 + 5.5 5.45


TA4050 50 2.25

TA4070 70 3.15

TA4085 85 3.85

TA4090 90 4.05

TA4100 100 4.50

TA4110 110 5.00

TA4115 115 5.20

TA4120 120 5.45

TA4125 125 5.65

TA4130 130 5.90

TA4135 135 6.10

TA4140 140 6.35

14 | T: 01473 820850 | celotex.co.uk


FF4050 50 2.25

FF4070 70 3.15

FF4075 75 3.40

FF4085 85 3.85

FF4090 90 4.05

FF4100 100 4.50

FF4125 125 5.65


Celotex FF4000

Celotex FF4000 is our specialist fl ooring product

targeted at under screed applications including under

fl oor heating systems. Featuring a high compressive

strength, FF4000 provides excellent dimensional

stability and greater resistance to site traffi c.

Celotex FF4000’s lightweight properties and versatility

proves valuable to the installer who benefi ts from

board grid markings and a foam structure ensuring

better clip retention and ease of underfl oor pipe

installation. Supported by BBA certifi cation, FF4000

represents a premium fl ooring option for insulating

below screed.

Always install Celotex FF4000 in accordance with the


Lambda0.022 W/mK


BBA certifi cate

95/3197

Accessories

Celotex Insulation Tape

For the sealing of joints when installing foil-faced

Celotex PIR insulation boards. This three-in-one

product prevents air leakage, completes the vapour

control layer and maximises thermal performance.

Celotex Insulation Tape is suitable for a range of

applications, including walling systems and pitched

and fl at

roofi ng applications.

Roll size50mm x 55metres.

Celotex Insulation Saw

When cutting Celotex PIR insulation boards, use

the Celotex Insulation Saw. The saw is the only one

on the market specifi cally for cutting PIR insulation

boards. Featuring fi ne, hard point teeth, it is proven to

dramatically reduce the amount of dust created when

cutting Celotex insulation boards as well as reducing

cutting time.

Physical propertiesSaw length: 350mm

Saw weight: 225grams

Tooth Protector Clip included

Celotex Insulation Clips

The Celotex Insulation Clip has been designed to

enable insulation boards to be installed between

timber joists or rafters quickly and without the need

for nails, screws or battens. They provide a permanent

way of securing the Celotex insulation with as little

fuss as possible. Using the clip ensures that the

insulation will be held fi rmly in place once installed in

the correct manner.

For full installation guidelines please visit celotex.co.uk

T: 01473 820850 | celotex.co.uk | 15

Celotex. Whatever the weather

Whatever the project, whatever the size, new build or refurbishment, Celotex can provide you with the ultimate insulation solution.

Off ering premium performance and the broadest range of PIR insulation available, Celotex ensures you can achieve better U-values

and thinner solutions.

With outstanding levels of expertise, our technical consultants will provide all the help and advice you need to specify Celotex products

with confi dence.

To fi nd out more google ‘insulation specialists’


16 | T: 01473 820850 | celotex.co.uk16 | T: 01473 820850 | celotex.co.uk

T: 01473 820850 | celotex.co.uk | 17

▶ Floors

▶ Walls

▶ Pitched roofs

▶ Flat roofs

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New build insulation solutions

18 | T: 01473 820850 | celotex.co.uk

Insulation solutions for fl oors

18 | T: 01473 820850 | celotex.co.uk

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▶ Concrete slab fl oors

▶ Beam and block fl oors

▶ Underfl oor heating

▶ Concrete soffi t fl oors

T: 01473 820850 | celotex.co.uk | 19

20 | T: 01473 820850 | celotex.co.uk

Calculating the P/A ratio

U-value calculationsTo calculate the minimum thickness of insulation needed in

a fl oor you should divide the exposed internal perimeter by

the internal area which will give you the P/A ratio.

Example 1 – detached dwelling

The overall internal dimensions of the dwelling are 8.10m x

6.90m; these measurements ignore the internal walls.

The exposed perimeter is 8.10m + 6.90m +

8.10m + 6.90m = 30.0m

The area is 8.10m x 6.90m = 55.89m

The P/A ratio is 30 / 55.89 = 0.54

For this example, with a concrete slab fl oor,

you will require:

65mm of insulation to achieve 0.22 W/m2K




Example 2 – new extension

The overall internal dimensions of the dwelling are 3.10m x

2.40m; these measurements ignore the internal walls.

The exposed perimeter is 2.40m + 3.10m + 1.22m = 6.72m

The area is 3.10m x 2.40m = 7.44m

The P/A ratio is 6.72 / 7.44 = 0.90


you will require:





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Example 3 – dwelling with integral garage

The overall internal dimensions of the dwelling are

8.50m x 6.90m; these measurements ignore the

internal walls.

The exposed perimeter is 8.50m + 6.90m + 7.30m +

2.88m + 1.20m + 4.02m = 30.8m

The area is (8.50m x 6.90m) – (1.20m x 2.88m) = 55.19m

The P/A ratio is 30.8 / 55.19 = 0.55


you will require:





22 | T: 01473 820850 | celotex.co.uk

U-value calculation: ground fl oor – concrete slab

0.07

0.07

0.08

0.08

0.08

0.09

0.09

0.09

0.10

0.10

0.10

0.11

0.11

0.11

0.11

0.12

0.12

0.12

0.08

0.09

0.10

0.10

0.11

0.11

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.17

0.17

0.18

0.09

0.10

0.11

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.09

0.11

0.11

0.12

0.13

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.24

0.09

0.11

0.12

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.18

0.19

0.20

0.20

0.21

0.23

0.24

0.25

0.09

0.11

0.12

0.13

0.14

0.14

0.14

0.15

0.17

0.19

0.19

0.19

0.20

0.21

0.22

0.24

0.25

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.19

0.19

0.20

0.21

0.22

0.23

0.24

-

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.19

0.20

0.20

0.21

0.23

0.24

0.25

-

-

0.10

0.12

0.13

0.13

0.14

0.15

0.15

0.16

0.17

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-

0.10

0.12

0.13

0.13

0.14

0.15

0.15

0.16

0.18

0.19

0.20

0.21

0.22

0.23

0.25

-

-

-

Perimeter / Area ratio

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Based on 65mm screed & 20mm insulation as perimeter upstand

Celotex Product

XR4200

XR4165

XR4150

XR4140

XR4130

FF4125

XR4120

XR4110

GA4100/FF4100

GA4090/FF4090

GA4085/FF4085

GA4080

GA4075/FF4075

GA4070/FF4070

GA4065

GA4060

GA4055

GA4050/FF4050

Concrete slab fl oors

Use Celotex GA4000, Celotex XR4000 or Celotex

FF4000 high performance insulation in concrete slab

fl oor applications to minimise insulation thickness and

give the following benefi ts:

▶ Easy-to-cut boards to fi t in most spaces

▶ Provides reliable long term energy savings

for buildings

▶ Excellent dimensional stability

▶ No thermal bridging at fl oor edges

▶ Tightly butted joints for insulation continuity

T: 01473 820850 | celotex.co.uk | 23

Over slab installation guidelines

▶ Install a damp proof membrane below the Celotex.

This can either be over the top of or below the

slab. The damp proof membrane must provide

continuity with the damp proof course in the

surrounding walls.

▶ Level the surface of the slab; it should be smooth

and free of projections.

▶ If required, use a thin layer of sand blinding on a

rough, tamped slab to ensure that the insulation

boards are continuously supported.

▶ Use the Celotex Insulation Saw to cut and fi t

insulation upstand to fl oor perimeter, to meet a

minimum R-value of 0.75m²K/W i.e. Celotex TB4020.

The upstand depth should be equal to the sum of

the slab insulation and the screed thickness. The

upstand thickness should not exceed the combined

thickness of the wall plaster and the skirting.

▶ Lay the insulation boards directly onto the prepared

slab with all joints tightly butted.

▶ A minimum 500 gauge separating layer must be

laid over the Celotex boards to prevent a reaction

between the wet screed and foil facer, act as a VCL

and prevent liquid screed migration between the

board joints.

▶ Apply a sand/cement or self-levelling screed

over the VCL and Celotex insulation boards to a

minimum thickness of 65mm.

Use scaff old boards or other protection to prevent

wheelbarrows and other traffi c damaging the

insulation.

These recommendations are suitable for normal

domestic fl oor loadings. If higher loadings are

required, it may be necessary to increase the screed

thickness and provide reinforcement within the

screed. Consult a structural engineer or a specialist

fl ooring contractor.

Under slab installation guidelines

▶ Level hardcore and blind with sand.

▶ Install damp proof membrane and lap into damp

proof course.


insulation, thickness to achieve required U-value.


insulation upstand to fl oor perimeter, to meet a

minimum R-value of 0.75m²K/W i.e. Celotex TB4020.

Height of insulation to coincide with required

fi nished fl oor level.

▶ Lay a polythene vapour control layer (VCL) over

the insulation to minimise the risk of condensation

forming at the insulation/slab interface.

▶ Lay concrete to required fi nished fl oor level and

smooth over with fl oat fi nish.

Chipboard fl oor fi nish

A VCL should be laid over the Celotex insulation boards

and turned up 100mm at room perimeters, behind the

skirting. It is recommended good practice that all joints

should be lapped 150mm and sealed.

The chipboard must be minimum 18mm tongued

and grooved fl ooring grade type C4 to BS 5669. Lay

the chipboard with staggered joints, glued with a

woodworking adhesive.

Provide a 10mm to 12mm gap at all perimeters and

abutments to allow for expansion. This can be achieved

by the use of temporary wedges.

Where chipboard is butted together without a tongued

and grooved joint and all external doorways (for the

width of the threshold), a treated timber batten must

be used in lieu of the insulation boards.

Installation guidelines

also suitable for

this applicationFR5000

24 | T: 01473 820850 | celotex.co.uk


U-value calculation: ground fl oor – beam & block


0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0Celotex Product

XR4200

XR4165

XR4150

XR4140

XR4130

FF4125

XR4120

XR4110

GA4100/FF4100

GA4090/FF4090

GA4085/FF4085

GA4080

GA4075/FF4075

GA4070/FF4070

GA4065

GA4060

GA4055

GA4050/FF4050


FF4000 high performance insulation in beam and block

fl oor applications to minimise insulation thickness and

give the following benefi ts:


▶ Provide reliable long term energy savings for

buildings


▶ Optimised continuity with wall insulation


Beam and block fl oors

0.08

0.09

0.09

0.10

0.10

0.11

0.11

0.11

0.12

0.13

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.16

0.09

0.10

0.11

0.11

0.12

0.12

0.13

0.14

0.14

0.16

0.16

0.17

0.17

0.18

0.19

0.20

0.21

0.22

0.09

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.24

0.09

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.16

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.25

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.19

0.19

0.20

0.21

0.22

0.24

0.25

-

-

0.10

0.11

0.12

0.13

0.14

0.15

0.15

0.16

0.17

0.19

0.20

0.21

0.22

0.23

0.24

0.25

-

-

0.10

0.12

0.13

0.13

0.14

0.15

0.15

0.16

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-

0.10

0.12

0.13

0.13

0.14

0.15

0.15

0.16

0.18

0.19

0.20

0.21

0.22

0.23

0.25

-

-

-

0.10

0.12

0.13

0.14

0.14

0.15

0.15

0.17

0.18

0.19

0.20

0.21

0.22

0.24

0.25

-

-

-


T: 01473 820850 | celotex.co.uk | 25

▶ If appropriate, install a damp proof membrane to

the top surface of the beam and block fl oor.

▶ Level the surface of the fl oor; it should be smooth

and free of projections. Use a thin layer of sand

blinding to ensure that the insulation boards are

continuously supported.


insulation upstand to fl oor perimeter, to meet

a minimum R-value of 0.75m2K/W i.e. Celotex

TB4020. The upstand depth should be equal to the

sum of the slab insulation and the screed thickness.

The upstand thickness should not exceed the

combined thickness of the wall plaster and the

skirting.


beam and block fl oor with all joints tightly butted.





board joints.

▶ Apply a sand/cement or self-levelling screed

over the Celotex insulation boards to a minimum

thickness of 65mm.



insulation.

Chipboard fl oor fi nish

A VCL should be laid over the Celotex insulation boards

and turned up 100mm at room perimeters, behind the

skirting. It is recommended good practice that all joints

should be lapped 150mm and sealed.

The chipboard must be minimum 18mm tongued




Provide a 10mm to 12mm gap at all perimeters and

abutments to allow for expansion. This can be achieved

by the use of temporary wedges.

Where chipboard is butted together without a tongued

and grooved joint and all external doorways (for the

width of the threshold), a treated timber batten must

be used in lieu of the insulation boards.


also suitable for


26 | T: 01473 820850 | celotex.co.uk

Use Celotex FF4000 high performance insulation

with underfl oor heating applications to minimise

insulation thickness and give the following benefi ts:

▶ Minimal downward heat loss into the structure


▶ Pipe retaining clips may be inserted directly into

the Celotex insulation

▶ Provides reliable long-term energy savings for

building structures


U-value calculation: ground fl oor – underfl oor heating

CelotexProduct

FF4125FF4100FF4090FF4085FF4075FF4070FF4050

FF4125FF4100FF4090FF4085FF4075FF4070FF4050

FF4125FF4100FF4090FF4080FF4075FF4070FF4050

0.090.100.100.100.110.110.12

0.110.120.130.130.140.140.16

0.130.140.150.150.160.170.18

0.110.130.130.140.150.150.18

0.120.140.160.160.170.180.22

0.160.180.190.200.210.220.25

0.120.140.150.160.170.180.22

0.130.160.170.180.190.200.24

0.180.200.210.220.240.25

-

0.130.150.160.170.180.190.24

0.140.160.180.180.200.21

-

0.180.210.230.240.25

--

0.140.160.170.180.200.200.25

0.140.170.180.190.210.22

-

0.190.220.240.25

---

0.140.170.180.190.200.21

-

0.140.170.190.190.210.22

-

0.190.230.240.25

---

0.140.170.180.190.210.22

-

0.150.170.190.200.220.23

-

0.200.230.25

----

0.140.170.190.200.210.23

-

0.150.180.190.200.220.23

-

0.200.240.25

----

0.150.170.190.200.220.23

-

0.150.180.190.200.220.23

-

0.200.24

-----

0.150.180.190.200.220.23

-

0.150.180.190.200.220.24

-

0.200.24

-----


0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Su

spe

nd

ed

Tim

be

r F

loo

rB

ase

d o

n t

imb

ers

@

40

0 c

trs

Be

am

& B

lock

Bas

ed

on

65

mm

scr

ee

d &

20

mm

insu

lati

on

as

pe

rim

ete

r u

pst

and

Co

ncr

ete

Sla

bB

ase

d o

n 6

5m

m s

cre

ed

& 2

0 m

min

sula

tio

n a

s p

eri

me

ter

up

stan

dUnderfl oor heating

T: 01473 820850 | celotex.co.uk | 27

Installation guidelinesPre-installation guidelines for concrete slab fl oor applications only

▶ Install a damp proof membrane below the Celotex.

This can either be over the top of or below the slab.

The damp proof membrane must provide continuity

with the damp proof course in the surrounding walls.




rough, tampered slab to ensure that the insulation



wheelbarrows and other traffi c damaging the insulation.

Installation guidelines for concrete slab and beam & block fl oor applications

▶ Use the Celotex Insulation Saw to cut and fi t insulation

upstand to fl oor perimeter, to meet a minimum

R-value of 0.75m2K/W i.e. Celotex TB4020. The upstand

depth should be equal to the sum of the slab insulation

and the screed thickness. The upstand thickness should

not exceed the combined thickness of the wall plaster

and the skirting.

▶ Lay the insulation boards directly into the prepared

slab/beam and block with all joints tightly butted.





board joints.

▶ Lay a proprietary underfl oor heating system, generally

comprising pipework in coils. Pipe retaining clips may

be inserted directly into the Celotex insulation.

▶ Apply the screed over the Celotex insulation boards

to a thickness recommended by the manufacturer of

the underfl oor heating system (normally 75mm).

▶ Compact the screed solidly when laid.

▶ Allow the screed to dry thoroughly before an

impermeable surface, such as a vinyl fl oor fi nish, is

applied. (Consult a specialist fl ooring contractor.)

These recommendations are suitable for normal

domestic fl oor loadings. If higher loadings are required

it may be necessary to increase the screed thickness

and provide reinforcement within the screed. Consult a

structural engineer or specialist fl ooring contractor.

Installation guidelines for suspended timber fl oor applications

▶ Install joists in the conventional manner, with solid

or diagonal strut bracing as necessary. (NB: diagonal

bracing may lead to thermal bridging).

▶ Fix battens to the sides of

the joists to support the

insulation and to form a

cavity for the underfl oor

heating, between

the insulation and

fl oor boards.

▶ Use the Celotex

Insulation

Saw to cut

the Celotex

FF4000 insulation

to achieve a tight fi t, then

push the boards fi rmly down

between the joists.

▶ Insulate the gaps

between the joists

and wall to

prevent thermal

bridging.

▶ Lay a

proprietary

underfl oor

heating system

within the cavity, generally comprising pipework in

coils, to the manufacturer’s guidelines.

▶ Install either chipboard or soft wood fl oor

boarding directly onto the joists.

28 | T: 01473 820850 | celotex.co.uk

Concrete soffi t fl oors

Use Celotex FR5000 premium performance insulation

in concrete soffi t fl oor applications to minimise


▶ A thermal conductivity value of 0.021W/mK

off ering enhanced thermal performance and

even better U-values

▶ An A+ rating when compared to the BRE Green

Guide

▶ Class O fi re performance throughout the entire

product

▶ Is a lighter weight solution than other insulation

options

▶ Tightly butted joints for installation continuity

▶ Provides long term energy savings for buildings

Construction Exposed Insulation Protected Insulation Thickness (mm) Thickness (mm)Inside surface resistance - - Concrete dense 150 150Variable layer See below See belowCavity (low emissivty) 25 x 50mm timber battens@ 600 ctrs n/a 25 Cementitous board n/a 6Outside surface resistance - -

Variable Layer Celotex Product Thickness U-value U-value (mm) W/m²K W/m²KCelotex FR5000 150 0.14 0.13Celotex FR5000 120 0.18 0.16Celotex FR5000 100 0.21 0.18Celotex FR5000 90 0.23 0.20Celotex FR5000 80 - 0.22Celotex FR5000 75 - 0.23Celotex FR5000 70 - 0.24

U-value calculation: concrete soffi t fl oors

T: 01473 820850 | celotex.co.uk | 29

Installation guidelines for direct fi xing to concrete soffi t

▶ It is recommended that the Celotex insulation

boards are installed with joints break-bonded.

▶ Directly fi x Celotex insulation to concrete soffi t.

Fixings should be evenly laid out with a minimum

of 12 fi xings per 1200mm x 2400mm board.

▶ Fixings should be installed between 50mm-150mm

from the edge and corners of the board. Suitable

fi xings should comprise a screw type suitable for

the concrete deck into which it is being driven,

combined with a circular or rectangular plate

washer having a surface area of not less than 45cm².

Advice on suitable fi xings should be sought directly

from the fi xing manufacturer.

Please note that the foil facer of the Celotex insulation

is not intended to provide a decorative fi nish. Where

additional protection is required please follow the

installation guidelines shown right.

Installation guidelines using cementitious board for additional protection

To calculate the minimum thickness of insulation

needed in a fl oor you should divide the exposed

internal perimeter by the internal area which will give

you the P/A ratio.

▶ It is recommended that the Celotex insulation

boards are laid with joints break-bonded.

▶ For optimum thermal performance, the unprinted

foil surface should face the air cavity.

▶ Directly fi x Celotex insulation and 25mm x 50mm

timber fi xing battens to concrete soffi t. The timber

battens should be fi xed underneath the layer of

Celotex insulation. Ensure that the timber fi xing

battens are secured at 600mm centres and that the

fi xings through into the concrete soffi t are also at

600mm centres.

▶ Fixings should be installed between 50mm-150mm

from the edge and corners of the board. Suitable

fi xings should comprise a screw type suitable for

the concrete deck into which it is being driven.



▶ To provide additional protection, fi x a layer of

cementitious board to the timber battens using

suitable screws or nails.

Insulated soffi t liner solutions

incorporating FR5000 are available

through our Assured Partners. Please

visit www.celotex.co.uk/soffi tliner

for further details.Super low

emissivity

also suitable for

this applicationXR4000GA4000


Insulation solutions for walls

T: 01473 820850 | celotex.co.uk | 31


▶ Masonry cavity walls

▶ Timber framed walls

▶ Steel stud framed walls

▶ Rainscreen cladding

▶ Masonry cavity walls

▶ Timber framed walls

▶ Steel stud framed walls

▶ Rainscreen cladding

T: 01473 820850 | celotex.co.uk | 31

32 | T: 01473 820850 | celotex.co.uk

Use Celotex CW4000 high performance insulation in

partial fi ll cavity wall applications to minimise insulation

thickness and give the following benefi ts:

▶ Easy to fi t between wall ties using cavity tie

clips for retention


for buildings

▶ Low emissivity foil facers give improved

thermal insulation within cavity air spaces


▶ Conveniently sized boards for installation

between cavity wall ties

Fig. 4

Fig. 1

Fig. 2

Fig. 3

Masonry cavity walls

T: 01473 820850 | celotex.co.uk | 33

▶ The wall ties used must be suitable for the structural

requirements and incorporate a retaining clip to

ensure that the insulation is held permanently in

place. The insulation is fi tted against the inner

leaf of the wall.

▶ BBA-approved wall ties and clips should be used

wherever possible. The advice of the wall tie

manufacturers should be followed, but Celotex does

not consider butterfl y ties to be suitable for use with

partial-fi ll cavity insulation.

▶ The fi rst row of board-retaining wall ties should be

installed at least one course below the damp proof

course (DPC) and positioned at maximum 600mm

centres horizontally, to provide a minimum support

of two ties per 1200mm board.

▶ The second and subsequent rows of ties should be

installed at 450mm centres vertically and maximum

900mm centres horizontally. Where required for

structural purposes, it may be necessary to install ties

at closer centres.

▶ Always ensure that each full or cut board is retained

by no fewer than three ties around its perimeter.



▶ Fit the boards between the wall ties, and secure in

place with a retaining clip on each tie. Ensure that

horizontal and vertical joints are tightly butted to

minimise heat loss.

▶ At openings such as doors and windows, use a

proprietary insulated cavity closer.

▶ Where necessary, cut the boards to size using the

Celotex Insulation Saw and straight edge.

▶ Where the cavity is closed at or below DPC level by a

methane barrier membrane, use mechanical fi xings

to secure the board to the brickwork above the DPC.

Avoid puncturing the gas barrier membrane.

▶ At internal (see Fig. 2) and external (see Fig. 3) angles,

ensure that the thickness of the board continues

around the angle and that suffi cient wall ties are used.

Gable walls

At gable walls (see Fig. 4) it is recommended that

Celotex CW4000 is taken up to the underside of the

roof verges. In cold roof constructions, the product

should extend at least 250mm above the ceiling

insulation. The top edge of the insulation should be

protected with a cavity tray.

Cavity fi re barriers

The requirements of the Building Regulations relating

to fi re spread in cavity walls can be met in buildings of

all purpose groups without the need for cavity barriers,

provided the construction complies with the provisions

detailed in: Approved Document B, Volume 1, Diagram

13; and Volume 2, Diagram 34. For further information

please refer to Celotex BBA certifi cate 94/3080.

Cavity obstructions

Unavoidable projections into the cavity, such as fl oor

edge beams and steel columns, need careful detailing

and may require a horizontal cavity tray.

To comply with the requirement of the National

House Building Council (NHBC) or Housing Association

Property Mutual (HAPM), a minimum 50mm clear

residual cavity should be provided in any exposed

zone.

For buildings up to 12m high, a minimum clear

cavity width of 25mm may be acceptable, subject to

exposure. The 25mm minimum constructed residual

cavity width must be clear of all obstructions.


also suitable for

this applicationCG5000

34 | T: 01473 820850 | celotex.co.uk

Blockwork comparison list

This table lists known lambda values

of major blockwork manufacturers’

products. Check with your supplier

for the latest information.

Thermal bridgingIn the past, buildings failed to

achieve their U-values. This was due

to thermal bridging that had not

previously been taken into account.

Mortar joints between insulating

concrete blocks are a signifi cant

example, but timber in stud framing

is another less well known form.

Lambda explained This Greek symbol is used to

represent the Thermal

Conductivity of a material, measured

in Watts per metre Kelvin (W/mK).

The block values quoted are taken

from the manufacturers’ literature

or by direct consultation with their

technical departments. The lambda

value for the Celotex CW4000 range

is 0.022 W/mK, as confi rmed on the

product’s CE marked labels.

Reading the tableAll of the following recommendations

are based on a wall construction of

103mm brickwork, a 50mm clear

cavity, Celotex cavity wall insulation to

the thickness specifi ed, a block inner

leaf thickness of 100mm, fi nished on

the inside with a lightweight plaster.

Simply select the type of block that

you wish to use and read across to the

minimum thickness of Celotex CW4000

needed for the desired U-value.

NB. Always install with the unprinted

foil surface facing the air cavity.

λ

Block Block Block U-value (W/m2K) manufacturer name lambda λ λ λ 0.28 0.25 0.20

Armstrong Lightweight 0.42 CW4050 CW4060 CW4080 Dense 1.13 CW4055 CW4065 CW4085Besblock Insulite Solid 0.34 CW4050 CW4060 CW4080Celcon Solar 0.11 CW4040 CW4050 CW4070 Standard 0.15 CW4050 CW4055 CW4075 Hi-Seven 0.19 CW4050 CW4055 CW4075Forticrete Lightweight 0.42 - 0.59 CW4055 CW4065 CW4085 Dense 0.93 - 1.13 CW4055 CW4065 CW4085Hanson Ultralite 0.29 CW4050 CW4060 CW4080 Superlite 0.40 CW4050 CW4060 CW4080 Fenlite 0.48 CW4055 CW4060 CW4085 Evalast 1.32 CW4055 CW4065 CW4085Interfuse Optilyte 0.20 CW4050 CW4055 CW4080 Interlyte 0.47 CW4055 CW4060 CW4085 Intercrete 1.13 CW4055 CW4065 CW4085Lignacite SP 0.79 CW4055 CW4065 CW4085 Standard 0.90 CW4055 CW4065 CW4085Masterblock Pumalite 0.44 CW4050 CW4060 CW4085 Lightweight 0.59 CW4055 CW4065 CW4085 Dense 1.06 CW4055 CW4065 CW4085Mona Precast Fibotherm 0.25 CW4050 CW4060 CW4080 Monalight 100S 0.50 CW4055 CW4060 CW4085 Monacrete 100 0.59 CW4055 CW4065 CW4085 GPI 0.41 CW4050 CW4060 CW4080 Monacrete 100S 1.13 CW4055 CW4065 CW4085Plasmor Fibolite 0.27 CW4050 CW4060 CW4080 Aglite 0.32 CW4050 CW4060 CW4080 Stranlite 0.46 CW4055 CW4060 CW4085 Plascon 1.06 CW4055 CW4065 CW4085RMC Readyblock 1100 0.34 CW4050 CW4060 CW4080 Readyblock 1400 0.59 CW4055 CW4065 CW4085 Readyblock Dense 1.13 CW4055 CW4065 CW4085Stock Blocks Ultralite 0.25 CW4050 CW4060 CW4080 Insulite 0.40 CW4050 CW4060 CW4080 Lyta 0.56 CW4055 CW4060 CW4085 Dense Concrete 0.99 - 1.25 CW4055 CW4065 CW4085Thermalite Turbo 0.11 CW4040 CW4050 CW4070 Shield 0.15 CW4050 CW4055 CW4075 Hi-Strength 7 0.19 CW4050 CW4055 CW4075 Hi-Strength 10 0.20 CW4050 CW4055 CW4080Topblock Supabloc 0.11 CW4040 CW4050 CW4070 Supabloc 4 0.16 CW4050 CW4055 CW4075 Supabloc 7 0.19 CW4050 CW4055 CW4075 Toplite GTI 0.11 CW4040 CW4050 CW4070 Toplite Standard 0.15 CW4050 CW4055 CW4075 Toplite 7 0.19 CW4050 CW4055 CW4075 Topcrete Fair Face 0.99 CW4055 CW4065 CW4085 Topcrete Dense 1.28 CW4055 CW4065 CW4085 Hemelite 3-5 0.45 CW4055 CW4060 CW4085 Hemelite 7 0.47 CW4055 CW4060 CW4085 Hemelite 10 0.49 CW4055 CW4060 CW4085

T: 01473 820850 | celotex.co.uk | 35

Construction 103mm brick or 100mm block | cavity | Celotex insulation | 103mm brick or 100mm block |

internal fi nish

Internal fi nish Blue = Lightweight plaster Pink = Plasterboard on plaster dabs

Example For a U-value of 0.20 W/m2K using a block outer leaf lambda value of 0.59 with block inner value

of 0.19. You will need Celotex CW4075 with lightweight plaster fi nish or Celotex CW4075 with

plasterboard on dabs.

λ 0.56 1.13 0.59 0.19 0.15 0.110.77 55 50 55 50 55 50 50 50 50 40 40 40

1.13 55 50 55 55 55 50 50 50 50 40 40 40

0.59 50 50 55 50 50 50 50 50 50 40 40 40

0.19 50 50 50 50 50 50 40 40 40 40 40 40

0.15 50 40 50 40 50 40 40 40 40 40 40 40

0.11 40 40 40 40 40 40 40 40 40 40 40 25

BrickBlock

BrickBlock

Inner leaf

Ou

ter

lea

f

Brick Block

Thickness of Celotex insulation for a U-value of 0.28 W/m2K



λ 0.56 1.13 0.59 0.19 0.15 0.110.77 65 60 65 60 65 60 55 55 55 50 50 50

1.13 65 60 65 60 65 60 55 55 55 50 50 50

0.59 60 60 65 60 60 60 55 50 55 50 50 50

0.19 55 50 55 55 55 50 50 50 50 50 50 40

0.15 50 50 55 50 55 50 50 50 50 40 40 40

0.11 50 50 50 50 50 50 50 40 40 40 40 40

Inner leaf

Ou

ter

lea

f

Brick Block

λ 0.56 1.13 0.59 0.19 0.15 0.110.77 75 70 75 75 75 70 70 65 65 65 60 60

1.13 75 70 75 75 75 70 70 65 65 65 60 60

0.59 75 70 75 70 75 70 65 65 65 60 60 60

0.19 65 65 70 65 65 65 60 55 60 55 55 50

0.15 65 60 65 65 65 60 60 55 55 55 50 50

0.11 60 60 60 60 60 60 55 50 50 50 50 50

Inner leaf

Ou

ter

lea

f

Brick Block


λ 0.56 1.13 0.59 0.19 0.15 0.110.77 85 80 85 85 85 80 75 75 75 70 70 70

1.13 85 80 85 85 85 80 80 75 75 75 70 70

0.59 80 80 85 80 80 80 75 75 75 70 70 65

0.19 75 75 80 75 75 75 70 65 65 65 65 60

0.15 75 70 75 75 75 70 65 65 65 60 60 60

0.11 70 65 70 70 70 65 65 60 60 60 60 55

Inner leaf

Ou

ter

lea

f

Brick Block

BrickBlock

BrickBlock

36 | T: 01473 820850 | celotex.co.uk

Masonry cavity walls with plasterboard laminate

Celotex off ers an alternative solution for partial fi ll

cavity wall applications enabling traditional sized cavity

wall widths to be maintained.

Celotex CW4000 provides the partial fi ll cavity wall

solution utilising the product’s low lambda value of

0.022W/mK along with low emissivity aluminium foil

facers which provide enhanced thermal performance

within a cavity air space.

As a secondary insulation measure, Celotex’

plasterboard thermal laminate PL4000 can be installed

on the warm side of the inner leaf, providing additional

thermal performance and plasterboard as one product.

This combined solution minimises insulation thickness

and off ers the following benefi ts:

▶ Products with a lambda value of 0.022W/mK

providing some of the thinnest insulation solutions

available today

▶ Allows for the traditional cavity space of 100mm

to be maintained without changing construction

methods and risking the loss of plot space

▶ Provides an alternative solution for meeting the

improved U-values required for Part L 2010

▶ CW4000 includes low emissivity foil facers giving

improved thermal insulation within cavity air spaces

▶ PL4000 provides insulation and plasterboard as

one product helping reduce installation time and

off ering maximum fl exibility to the installer

▶ PL4000 is suitable for both direct bonding

(dot and dab) and mechanical fi xing installations

▶ PL4000 provides a vapour control layer (VCL) when

board joints are taped and jointed

▶ Provides reliable long term energy savings for

buildings


Partial fi ll cavity wallsGuidelines for the installation of partial fi ll cavity wall

insulation can be found on page 32 and 33 of this

Handy Guide.

Internal walls using PL4000Guidelines for the installation of Celotex PL4000

plasterboard thermal laminate can be found on

page 72 and 73 of this Handy Guide.

T: 01473 820850 | celotex.co.uk | 37

Construction 103mm brick or 100mm block | cavity | 50mm Celotex CW4000 | 103mm brick or 100mm block |

Celotex PL4000

All U-values shown below assume 50mm CW4000 as the partial fi ll cavity wall solution with a brick outer leaf

(lambda 0.77W/mK) and a 3mm plaster skim. Installing alternative thicknesses of CW4000 within the cavity wall

will have an impact on achieved U-value. This solution is also possible using Celotex PL4000 mechanically fi xed

using battens. For further information and U-values, please visit our online U-value calculator or contact the

Celotex Technical Centre.

U-value calculation: Partial fi ll cavity wall with internal layer of Celotex PL4000

Block lambda (W/mK)

Variable Layer ThicknessCelotex PL4000 65 + 12.5Celotex PL4000 60 + 12.5Celotex PL4000 55 + 12.5Celotex PL4000 50 + 12.5Celotex PL4000 45 + 12.5Celotex PL4000 40 + 12.5Celotex PL4000 25 + 12.5Celotex PL4000 15 + 9.5

1.13U-value(W/m²K)

0.150.160.170.170.180.190.210.24

0.59U-value(W/m²K)

0.150.160.160.170.180.180.210.23

0.15U-value(W/m²K)

0.140.150.150.160.170.170.190.21

1.13U-value(W/m²K)

0.160.160.170.180.180.190.220.25

0.59U-value(W/m²K)

0.160.160.170.170.180.190.220.24

0.15U-value(W/m²K)

0.150.150.160.160.170.180.200.22

Dot & Dab Mechanically fi xed direct to wall

also suitable for

this applicationCG5000FR5000

38 | T: 01473 820850 | celotex.co.uk

Use Celotex XR4000 high performance insulation

in timber frame wall lining applications to minimise


▶ Off ers the thinnest solution available


for buildings

▶ Low emissivity foil facers give improved thermal

insulation within cavity air spaces

▶ Reduces thermal bridging through studs and

rails, when used in a two-layer system

▶ Provides cavity for services

Construction

Outside surface resistanceBrickCavityPlywoodVariable layerCavity (low emissivity) between studs (15% brg)Polythene 1000 gauge, VCLPlasterboardInside surface resistance

Variable Layer

Celotex XR4000 between 175 stud (15% brg)Celotex XR4000 between 175 stud (15% brg)Celotex XR4000 between 150 stud (15% brg)Celotex XR4000 between 150 stud (15% brg)Celotex XR4000 between 125 stud (15% brg)Celotex XR4000 between 125 stud (15% brg)

Thickness(mm)

-103509

See below5.0/10.0/15.0/20.0/25.0

-12.5

-

U-value calculation: timber frame wall lining

Thickness(mm)165150140130120110

U-value(W/m2K)

0.190.200.220.220.250.25

U-value: For U-values see variable layer list

Timber frame wall lining

T: 01473 820850 | celotex.co.uk | 39

▶ Make sure all studs and rails are fl ush, with no

projections, and that services are correctly installed.

▶ Use the Celotex Insulation Saw to cut the boards to

fi t tightly between all studs and rails.

▶ Insert insulation into framing and push back

to plywood sheathing. Fit services into cavity if

required.



▶ Use the Celotex Insulation Saw to cut the boards for

infi ll panels, using off -cuts where possible, making

sure there are no gaps at wall abutments.

▶ Ensure that the wall insulation is continuous with

the fl oor perimeter insulation.

▶ A vapour control layer (VCL) should be installed

over the warm side of the studwork.

▶ Fix plasterboard lining over the VCL using

plasterboard nails or screws.

NB: Some building insurance companies may

require additional third party approval when using

insulation in timber frame applications. Advice

should be sought from the relevant parties prior

to specifying the insulation required. Celotex

insulation is covered by BBA certifi cate number

09/4667.


also suitable for


40 | T: 01473 820850 | celotex.co.uk

Use Celotex GA4000 high performance insulation in

timber frame wall sheathing applications to minimise


▶ Eliminates thermal bridging of timber


for buildings

▶ Low emissivity foil facers give improved

thermal insulation performance within cavity

air spaces

▶ Sheathing encapsulates the timber frame

▶ No threat of interstitial condensation

▶ Voids between studs free for services

Construction

Outside surface resistanceBrickCavity (low emissivity)Variable layerPlywoodCavity between studsPolythene 1000 gauge, VCLPlasterboardInside surface resistance

Variable Layer

Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000 Celotex GA4000Celotex GA4000Celotex GA4000

Thickness(mm)

-10350

See below9

89-

12.5-

U-value calculation: timber frame wall sheathing

Thickness(mm)100908580757065605550

U-value(W/m2K)

0.170.190.190.200.210.220.230.250.260.28


Timber frame wall sheathing

T: 01473 820850 | celotex.co.uk | 41


projections.

▶ Fix sheet of Celotex GA4000 to the external

sheathing using galvanised clout nails at 400mm

centres in the centre of the board and at 300mm

centres around the perimeter.



▶ Care must be taken to align the fi xings with

underlying studs, sole plates and head rails.

▶ Tightly butt boards together and use off -cuts to fi ll

in around waist rails.

▶ Brickwork should be tied back to the timber

framing using helical stainless steel wall ties, driven

through the Celotex insulation into the studs.

▶ Insert ties approximately 10mm to 20mm above

the brick course so that a slight ‘crank’ can be

applied. This ensures that the tie slopes downward

from the sheathing to the outer brickwork.

▶ Where cavity fi re barriers are required by national

building regulations, they should be installed in line

with the manufacturer’s instructions.







09/4667.

Gable walls

At gable walls, it is recommended that the insulation

be taken up to the underside of the roof verges.

However, if a cold roof construction is intended, the

cavity insulation should extend at least 250mm above

the ceiling. The top edge of the insulation should be

protected with a cavity tray.

Other cladding

Tile hanging, render fi nish, weather boarding and other

cladding types are all suitable for this application. In

this situation, Celotex boards can be protected with a

breather membrane. However, advice and information

on the installation of these cladding systems should

be sought from the manufacturer or provider of the

cladding system.


also suitable for


42 | T: 01473 820850 | celotex.co.uk

Use Celotex TB4000 or Celotex GA4000 high

performance insulation in steel stud framed wall

applications to minimise insulation thickness and give

the following benefi ts:

▶ Ideal for lightweight, steel framed commercial and

industrial buildings


for buildings

▶ Low emissivity foil facer gives improved thermal

insulation performance within cavity air spaces

▶ Rapid, accurate construction on-site

▶ Facilitates off -site fabrication of framed panels

▶ Warm frame construction eliminates thermal

bridging through studs

▶ Thin overall construction depth

U-value calculation: steel stud framed wall

Construction

Outside surface resistanceBrickCavity (low emissivity)Variable layer (over studs)Cavity (low emissivity)Polythene 1000 gauge, VCLPlasterboardPlasterboardInside surface resistance

Variable Layer

Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex GA4000Celotex TB4000Celotex TB4000Celotex TB4000Celotex TB4000

Thickness(mm)

-10350

See below100

-12.512.5

-

Thickness(mm)10090858075706560555045403530

U-value(W/m2K)

0.170.180.180.190.200.210.220.230.250.260.280.300.320.34


Steel stud framed walls

T: 01473 820850 | celotex.co.uk | 43

▶ Install the steel stud framework in accordance with

the manufacturer’s instructions.



▶ If necessary, trim the Celotex insulation boards to a

width and height to ensure that the edges are fully

supported by the frame studs or horizontal runners.

▶ Trim boards to fi t around window and door

openings.

▶ Place the boards directly against the external face

of the steel frame and temporarily fi x with suitable

self-tapping screws and washers.

▶ Adjacent boards must be tightly butted to minimise

heat loss.

▶ Where the frame is to be faced with brickwork,

place wall tie retaining channels over the boards at

stud positions and fi x through the insulation into

the studs with fasteners as recommended by the

channel manufacturer.

▶ Construct the brickwork facing incorporating

twist-in ties at recommended intervals.

▶ Where cavity fi re barriers are required by national

building regulations, they should be installed in line

with the manufacturer’s instructions.

Other cladding

Tile hanging, render fi nish, weather boarding and other

cladding types are all suitable for this application. In

this situation, Celotex boards must always be protected

with a breather membrane. However, advice and

information on the installation of these cladding

systems should be sought from the manufacturer or

provider of the cladding system.


also suitable for


44 | T: 01473 820850 | celotex.co.uk

Use Celotex FR5000 premium performance insulation

in rainscreen cladding applications up to 18m in height

to minimise insulation thickness and give the following

benefi ts:

▶ A thermal conductivity value of 0.021 W/m2K

off ering enhanced thermal performance and even

better U-values

▶ Ideal for use with masonry, steel or timber frame

systems

▶ Provides reliable long term energy savings for

buildings

▶ Super low emissivity foil facers give improved

thermal insulation values within cavity air spaces

▶ Warm frame construction elimates thermal

bridging through studs

Rainscreen cladding

Construction With rails or brackets With rails or brackets bridging insulation over insulation

Thickness (mm) Thickness (mm)Outside surface resistance - -Cladding - -Ventilated cavity between rails/brackets - -Breather membrane - -Variable layer See below See belowCelotex IQ cavity between steel frame 100 100Polythene 1000 gauge, VCL & air leakage barrier - -Plasterboard 12.5 12.5Plasterboard 12.5 12.5Inside surface resistance - -

Variable Layer Thickness U-value U-value (mm) W/m²K W/m²KCelotex FR5000 150 0.18 0.13Celotex FR5000 120 0.21 0.16Celotex FR5000 100 0.23 0.18Celotex FR5000 90 0.25 0.20Celotex FR5000 80 0.27 0.22Celotex FR5000 75 0.28 0.23Celotex FR5000 70 0.29 0.24Celotex FR5000 60 0.32 0.27Celotex FR5000 50 - 0.31Celotex FR5000 40 - 0.35

VCL = Vapour control layer

U-value calculation: rainscreen cladding (up to 18 metres)

T: 01473 820850 | celotex.co.uk | 45

▶ Please note that Celotex FR5000 can only be used

in rainscreen cladding applications up to 18m in

height.

▶ Tile hanging, weather boarding and other cladding

types are all suitable for this application. Celotex

boards must always be protected with a breather

membrane.

▶ In all instances, advice and information on the

installation and fi xings of cladding systems should

be sought directly from the manufacturer or

provider of the cladding system.

▶ When cutting Celotex insulation boards on site, use

the Celotex Insulation Saw.


TB4000also suitable for

this applicationGA5000GA4000Super low

emissivity

46 | T: 01473 820850 | celotex.co.uk

Insulation solutions for pitched roofs

46 | T: 01473 820850 | celotex.co.uk

T: 01473 820850 | celotex.co.uk | 47


▶ Pitched roof sarking

▶ Insulation between and over rafters

▶ Insulation between rafters

▶ Insulation between and under rafters

T: 01473 820850 | celotex.co.uk | 47

48 | T: 01473 820850 | celotex.co.uk

Thickness(mm)

---

2225

See below150

-12.5

-

Construction

Outside surface resistanceTiling including batten spaceBreather membraneCavity / counter battenCelotex TB4000 between 47 x 47 counter battens @ 400 ctrsVariable layerCavity (low emissivity) rafter space (11.7% brg)Polythene 1000 gauge, VCLPlasterboardInside surface resistance

Variable Layer

Celotex XR4000 over rafterCelotex XR4000 over rafterCelotex XR4000 over rafterCelotex XR4000 over rafterCelotex XR4000 over rafterCelotex XR4000 over rafterCelotex XR4000 over rafterCelotex GA4000 over rafterCelotex GA4000 over rafterCelotex GA4000 over rafterCelotex GA4000 over rafterCelotex GA4000 over rafterCelotex GA4000 over rafterCelotex GA4000 over rafter

Thickness(mm)200165150140130120110100908580757065

U-value(W/m2K)

0.090.100.110.120.120.130.140.150.160.170.170.180.190.20

U-value calculation: pitched roof sarking


Pitched roof sarking

Use Celotex GA4000 or Celotex XR4000 high performance

insulation in pitched roof sarking applications to minimise insulation


▶ Provides reliable long term energy savings for buildings

▶ Low emissivity foil facers give improved thermal

insulation performance within cavity air spaces

▶ Eliminates thermal bridging

▶ Optional single layer system

▶ Ideal for new build or major refurbishment projects

▶ Air-tight construction method

T: 01473 820850 | celotex.co.uk | 49

▶ Note that specifi c fi xing requirements should be

determined for each roof, taking into account roof

design and location.

▶ Fix a treated timber stop batten equal in thickness

to the Celotex insulation across the rafters at the

eaves. Butt boards directly against this batten.

▶ Install Celotex insulation boards with the long

sides parallel to the rafter lines with both edges

supported by rafters.


foil surface should face the rafter air cavity.

▶ Cut the boards using the Celotex Insulation Saw to

rake and splay at ridge and verges to ensure close

butted joints.

▶ Use large headed nails to fi x boards in place

temporarily until permanently secured by counter

battens.

▶ Position a preservative-treated timber counter

batten (minimum 38mm x 50mm) over the

insulation on the line of each rafter. Nail the lower

end of each counter batten directly into the stop

batten.

▶ Calculate the length of the stainless steel helical

spike fi xings required by adding together the

counter batten depth, the insulation thickness and

depth of penetration required to the rafter (usually

minimum 38mm).

▶ Stainless steel helical spikes have been specifi cally

developed for ‘warm’ pitched roofs and are

especially appropriate for use with pre-trussed

rafter constructions, allowing a much thinner gauge

of fastener to be used, thus reducing the risk of

splitting timber battens or rafters.

▶ Fix at maximum 400mm centres along the counter

batten. Pre-drill pilot holes in the counter battens

to ensure ease of nailing and to reduce the possible

splitting of the timber.

▶ If using a two layer system, cut a second layer

of board with the Celotex Insulation Saw (the

board should be at least 13mm less than the

counter batten thickness allowing for the breather

membrane to sag) to fi t between the counter

battens.

▶ Drape a breather membrane over the counter

battens and secure with tile battens.

▶ Fix the tile battens to the counter batten at an

appropriate gauge to suit the slates or tiles selected.

▶ A variety of eaves and verge details may be

achieved with this system. Eaves and soffi t

ventilators are not generally required.

▶ A vapour control layer (VCL) should be installed to

the underside of the rafters.

▶ Finish with plasterboard or other suitable sheet

material fi xed to the rafters.

▶ Where exposed rafters are required, plasterboard

(or any other suitable decorative board) may be

laid over the rafters before fi xing the insulation.

Select longer fasteners to suit. Plasterboard should

be protected from rain during the installation.

A polythene vapour control layer (VCL) must be

installed directly over the plasterboard.


also suitable for


50 | T: 01473 820850 | celotex.co.uk

Construction

Outside surface resistanceTiling including batten spaceCounter battenBreather membraneVariable layerCelotex TB4000 between rafters @ 400 ctrs (11.7% brg)Cavity (low emissivity) rafter spacePolythene 1000 gauge, VCLPlasterboardInside surface resistance

Variable Layer

Thickness(mm)

--

38-

See below40

110-

12.5-

Celotex XR4000 over rafter







Celotex GA4000 over rafter







Thickness(mm)200

165

150

140

130

120

110

100

90

85

80

75

70

65

U-value(W/m2K)

0.09

0.10

0.11

0.12

0.12

0.13

0.14

0.15

0.16

0.17

0.17

0.18

0.19

0.20


Use Celotex GA4000 or Celotex XR4000 high

performance insulation in pitched roof between and over

rafter applications to minimise insulation thickness and give


▶ Ideal for use where headroom is limited


▶ Creates a warm, habitable roof space

▶ No need to insulate water pipes and tanks

▶ Suitable for new build and major refurbishment projects

▶ Minimised additional loading to the structure

U-value calculation: between and over rafters

Insulation between and over rafters

T: 01473 820850 | celotex.co.uk | 51

Insulation over the rafters

▶ Note that specifi c fi xing requirements should be

determined for each roof, taking into account roof

design and location.

▶ Fix a treated timber stop batten equal in thickness

to the Celotex insulation across the rafters at the

eaves. Butt boards directly against this batten.

▶ Install Celotex insulation boards with both edges

supported by the rafters.

▶ Cut the boards using the Celotex Insulation Saw to

rake and splay at ridge and verges to ensure close

butted joints.

▶ !Use large headed nails to temporarily fi x board

in place, until permanently secured by counter

battens.

▶ !Install a breather membrane over the insulation.

▶ Position a preservative-treated timber counter

batten (minimum 38mm x 50mm) over the breather

membrane and insulation on the line of each rafter.

Nail the lower end of each counter batten directly

into the stop batten.

▶ Calculate the length of the suitable fi xings required

by adding together the counter batten depth,

the insulation thickness and depth of penetration

required to the rafter (usually minimum 38mm).

▶ Fix at maximum 400mm centres along the counter

batten. Pre-drill pilot holes in the counter battens

to ensure ease of nailing and to reduce the possible

splitting of the timber.

▶ Fix the tile battens to the counter battens at an

appropriate gauge to suit the slates or tiles selected.

Insulation between the rafters

▶ For optimum thermal performance the unprinted

foil surface should face the rafter air cavity.

▶ Accurately measure the width to be fi lled between

the inside face of the rafters, prior to cutting the

board.

▶ Use the Celotex Insulation Saw to cut the Celotex

board at a slight angle, making the board width

slightly oversized on one surface to achieve a

‘friction fi t’.

▶ Push the board into the void between the rafters

until it is tight against the underside of the fi rst layer

of insulation.

▶ To hold the boards in place, use battens along the

side of the rafters.

▶ Tightly fi t the insulation to the ridge plate and carry

over and tightly butt the wall plate at eaves.


the underside of the rafters. A polythene sheet of

higher vapour resistance is recommended for high

humidity areas such as kitchens or bathrooms.

▶ Finish with plasterboard or other suitable sheet

material, fi xed to the rafters.

NB: This solution is not suitable for exposed rafters.

Where exposed rafters are required, please refer to

the pitched roof sarking application on pages

48 and 49.


also suitable for


52 | T: 01473 820850 | celotex.co.uk

Insulation between rafters

Construction

Outside surface resistanceTiling including batten spaceBreather membraneLow E cavity, remainder of rafter depthVariable layer (for between rafters)Polythene, 1000 gauge VCLPlasterboardInside surface resistance

Variable Layer

Celotex XR4000 @ 400 ctrsCelotex XR4000 @ 400 ctrsCelotex XR4000 @ 400 ctrsCelotex XR4000 @ 400 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrs

200 mm deep rafters 175 mm deep rafters 150 mm deep rafters Thickness (mm) Thickness (mm) Thickness (mm) - - - - - - - - - Various Various Various See below See below See below - - -

12.5 12.5 12.5 - - - Thickness U-value U-value U-value (mm) (W/m²K) (W/m²K) (W/m²K) 200 0.17* - - 165 0.18 0.19* - 150 0.19 0.20 - 140 0.20 - - 200 0.15* - - 165 0.17 0.17* - 150 0.18 0.18 0.20* 140 0.19 0.19 0.20* 130 0.20 0.20 0.20

U-value calculation: unventilated between rafters

* = Counter batten over membrane - see installation guidelines

Use Celotex XR4000 high performance insulation in between



▶ Optional single-layer insulation reduces cutting


▶ Easy to dry line with plasterboard once installed

▶ Dimensionally stable

▶ No loss of internal headroom

▶ Ideal for loft conversions / room in roof applications

T: 01473 820850 | celotex.co.uk | 53


▶ Make sure there is enough rafter depth to

accommodate not only the thickness of the Celotex

insulation, but also a minimum 20mm drape space

for the breathable membrane.



▶ Fix battens to the inside face of the rafters, to ensure

that the drape space is maintained.

▶ Alternatively, counter battens can be fi xed over

the breathable membrane to provide a channel for

moisture run off . The whole depth of the rafter can

then be fi lled with insulation.

▶ All details are to be in accordance with the

membrane manufacturer’s details.

▶ Measure the space to be fi lled between the inside

face of the rafter prior to cutting the board.

▶ Use the Celotex Insulation Saw to cut the boards

at a slight angle, making the board width slightly

oversized on one surface to achieve a ‘friction fi t’.

▶ Push the boards into the void between the rafters until

they are tight up to the battens or the membrane,

ensuring that lateral joints are closely butted.

▶ Tightly fi t the insulation to the ridge plate and carry

over and tightly butt the wall plate at eaves.


the underside of the rafters. A polythene sheet of

higher vapour resistance is recommended for high

humidity areas such as kitchens or bathrooms.

▶ Complete the internal fi nish with plasterboard or

other suitable sheet material.

also suitable for


54 | T: 01473 820850 | celotex.co.uk

Use a combination of Celotex GA4000 or Celotex XR4000

with Celotex PL4000 high performance plasterboard

thermal laminate in pitched roof between and under rafter

applications to minimise insulation thickness and give the

following benefi ts:

▶ Provides both the below rafter insulation and

plasterboard in one product, helping reduce

installation time

▶ Off ers the installer maximum fl exibility and installation

speed due to the tapered edge plasterboard

▶ Ideal for use with shallow rafters


buildings




▶ Upgrade existing ceilings to current standards

U-value calculation: unventilated between and under rafters

Construction

Outside surface resistance

Tiling including batten space

Breather membrane

Low E cavity between rafters (11.7% brg)

Celotex between rafters @ 400 ctrs (11.7% brg)

Variable layer (for below rafters)

Inside surface resistance

Variable Layer

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

GA = GA4000 XR = XR4000

100mm 125mm 150mm 175mm deep rafters deep rafters deep rafters deep rafters Thickness Thickness Thickness Thickness (mm) (mm) (mm) (mm)

- - - -

- - - -

- - - -

20 25 30 25

GA4080 GA4100 XR4120 XR4150

See below See below See below See below

- - - -

Thickness U-value U-value U-value U-value (mm) (W/m²K) (W/m²K) (W/m²K) (W/m²K)

65 + 12.5 0.16 0.14 0.13 0.12

60 + 12.5 0.16 0.15 0.13 0.12

55 + 12.5 0.17 0.15 0.14 0.12

50 + 12.5 0.18 0.16 0.14 0.13

45 + 12.5 0.18 0.16 0.15 0.13

40 + 12.5 0.19 0.17 0.15 0.14

25 + 12.5 - 0.20 0.17 0.15

15 + 9.5 - - 0.19 0.17

Insulation between and under rafters

T: 01473 820850 | celotex.co.uk | 55


Construction

Outside surface resistanceTiling including batten spaceSarking feltVentilated cavityCelotex between rafters @ 400 ctrs (11.7% brg)Variable layer (for below rafters)Inside surface resistance

Variable Layer

Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000

GA = GA4000 XR = XR4000

100mm 125mm 150mm 175mm deep rafters deep rafters deep rafters deep rafters Thickness Thickness Thickness Thickness (mm) (mm) (mm) (mm) - - - - - - - - - - - - 50 50 50 55 GA4050 GA4075 GA4100 XR4120 See below See below See below See below - - - -

Thickness U-value U-value U-value U-value (mm) (W/m²K) (W/m²K) (W/m²K) (W/m²K) 65 + 12.5 0.20 0.17 0.15 0.14 60 + 12.5 - 0.18 0.16 0.14 55 + 12.5 - 0.19 0.16 0.15 50 + 12.5 - 0.20 0.17 0.15 45 + 12.5 - - 0.18 0.16 40 + 12.5 - - 0.19 0.17 25 + 12.5 - - - 0.19

U-value calculation: ventilated between and under rafters

Installation guidelines: ventilated

▶ Make sure there is enough rafter depth to


insulation but also a 50mm ventilated airspace

above the boards.

▶ Fix battens to the inside face of the rafter so that the

bottom of the batten is 50mm below the sarking felt.

Installation guidelines: unventilated



▶ Install the breather membrane over the rafters.

Fix battens to the side of the rafters to allow the

membrane to sag between the rafters. Alternatively,

fi x counter battens over the membrane, leaving the

entire rafter depth to be fi lled with insulation. All

details are to be in accordance with the membrane

manufacturer’s recommendations.

Installation guidelines: ventilated & unventilated


face of the rafter prior to cutting the board.


at a slight angle, making the board width slightly

oversized on one surface to achieve a ‘friction fi t’.

▶ Push the boards into the void between the rafters

until they are tight up to the battens or the

membrane, ensuring that lateral joints are closely

butted. Secure PL4000 with suitable mechanical

fi xings. Fixing details should be in accordance with

the fi xing manufacturer’s instructions.

▶ Joints between boards must be tightly butted,

taped and jointed using appropriate tape and

jointing material to create the vapour control layer.




Insulation solutions for fl at roofs

T: 01473 820850 | celotex.co.uk | 57


▶ Built-up fl at roofi ng applications

▶ Single-ply fl at roofi ng applications

T: 01473 820850 | celotex.co.uk | 57

58 | T: 01473 820850 | celotex.co.uk

Construction Concrete Concrete Steel Steel Timber Timber Deck Deck Deck Deck Deck Deck Fully Mechanically Fully Mechanically Fully Mechanically Bonded Fixed Bonded Fixed Bonded Fixed Thickness Thickness Thickness Thickness Thickness Thickness

(mm) (mm) (mm) (mm) (mm) (mm)Outside surface resistance - - - - - - Built-up roofi ng 12 12 12 12 12 12 Variable layer See below See below See below See below See below See belowVCL as BS6229:2003 - - - - - - Concrete deck 250 250 n/a n/a n/a n/a Steel deck n/a n/a 1.5 1.5 n/a n/aTimber deck plywood n/a n/a n/a n/a 19 19 Cavity between joist at 11.7% bridging n/a n/a n/a n/a 150 150 Plasterboard n/a n/a n/a n/a 12.5 12.5Inside surface resistance - - - - - -

Variable Layer Thickness U-value U-value U-value U-value U-value U-value (mm) W/m2K W/m2K W/m2K W/m2K W/m2K W/m2K

Celotex EL3000/TC3000 150 0.16 0.18 0.16 0.19 0.15 0.17 Celotex EL3000/TC3000 140 0.17 0.19 0.17 0.20 0.16 0.18 Celotex EL3000/TC3000 130 0.18 0.21 0.18 0.21 0.17 0.20 Celotex EL3000/TC3000 120 0.19 0.22 0.20 0.23 0.18 0.21

Celotex EL3000/TC3000 100 0.24 - 0.25 - 0.22 -

U-value calculation: warm fl at roof - built-up roofi ng

Use Celotex EL3000 or Celotex TC3000 high

performance insulation in built-up fl at roofi ng

applications. Celotex EL3000 and Celotex TC3000 are

both suitable for use in hot applied bituminous and

mastic asphalt waterproofi ng systems. Celotex TC3000 is

also suitable for use in torch-on fl at roofi ng applications.

When designing a fl at roof using Celotex EL3000 or

TC3000 boards, three basic principles apply:

1. Design to a fall of 1:80, 1:60 or 1:40 as appropriate

to the weathering system, type of deck and

construction tolerances.

2. Have due regard for the use and design of the

building and the need to ensure that the design

will not allow for a build up of moisture below the

waterproofi ng membrane.

3. Provide adequate protection for both insulation

and waterproofi ng if signifi cant foot traffi c is

expected either during or after the completion of

the roof.

Installation guidelinesHot-applied systems

The felt vapour control layer (VCL) in accordance

with BS 6229 should be fully sealed at all laps prior to

applying the insulation. At perimeters and abutments

the VCL should be turned up around the insulation

board edges and a fl ap of approximately 300mm

should be bonded to top surface of the insulation. The

VCL should be fully bonded to concrete decks using

hot bitumen adhesive, strip-bonded to the ribs of metal

decks and partially bonded to timber decks. On timber

decks, the VCL may be nailed to the deck but laps

should be sealed with the appropriate adhesive.

When used on metal decks Celotex EL3000 boards

should be laid with the perforated facer uppermost

and the long sides at right angles to corrugations and

bonded in a full mop of hot bitumen to the VCL. The

torch-on technique is not suitable with EL3000 and

should only be carried out on Celotex TC3000 boards.

Built-up fl at roofi ng applications

T: 01473 820850 | celotex.co.uk | 59

Three layer felt system using torch-on technique

▶ The felt vapour control layer (VCL) in accordance

with BS 6229 should be fully bonded to the deck

prior to the installation of the insulation.

▶ Bond the boards to the VCL and lay the insulation

with joints break-bonded. Alternatively the boards

can be mechanically fi xed to the deck.

▶ Loose-lay the venting layer directly over the

insulation boards.

▶ Torch-on the underlay sheet over the venting layer

and to fi nish torch the mineral surface cap sheet to

the underlay.

▶ To ensure the best possible bond, the torch-on

technique should apply 60% of the fl ame to the

board with 40% to the felt.

Celotex TC3000 is also compatible with pour and roll

and mastic asphalting installation techniques. Please

contact the Celotex Technical Centre for installation

guidance using these techniques.

Mechanical fastening

Guidance on fi xings and patterns can be sought from

fi xing manufacturers and in the BRUFMA information

document on mechanical fi xings for rigid PIR roofboards.

Installation of weathering systems

Diff erent types of weathering systems require diff erent

installation instructions and guidelines. Advice on the

installation of these weathering systems should be

sought directly from the manufacturer or provider of

the weathering system type.

Laying pattern

It is recommended that the boards are laid with joints

break-bonded.

Supporting deck

The supporting deck must provide adequate support

for the VCL and insulation board with joints being

supported by the ridges of the deck. It must be capable

of supporting the static and dynamic design loads

and the loads associated with the construction activity

without defl ection in excess of the limits defi ned in BS

6399: Part 1. The deck must be structurally sound, dry,

clean and where necessary primed before application

of the weathering and insulating system.

Traffi cking

Boards are capable of withstanding the traffi cking

associated with normal roof laying work. However,

roofs are generally designed for occasional lightweight

foot traffi c or maintenance access. Where more

frequent or heavier access is required, protective

walkways should be provided. Under no circumstances

should the roof be used as a working platform, either

during or after the construction programme. Extra

care should be taken to protect the insulation and

weathering when ballasting.

Loose-laid roof boards under ballasted systems

When the ballasting system is not installed

immediately following the application of loose-laid

roof boards, additional attachment is required. Please

refer to BRUFMA Information Document “Securing PIR

& PUR Roof Boards Beneath Single-Ply Waterproofi ng

Membranes” for further information.

Use of adhesives

When using adhesives, the installer should take care

not to use products that contain chemicals likely to

attack the insulating foam such as ketonic solvents.

Celotex EL3000 and Celotex TC3000 contain no

chemicals or solvents likely to damage the PVC

membrane. When using adhesives, the installer should

check the compatibility of the adhesive with the

adhesive manufacturer.

60 | T: 01473 820850 | celotex.co.uk

Single-ply membrane fl at roofi ng applications

Use Celotex EL3000 high performance insulation in

either mechanically fi xed or fully adhered single-ply fl at

roofi ng applications. The unperforated facer is suitable

for single-ply fully adhered roof systems and self-

adhesive membranes.

When designing a fl at roof using Celotex EL3000

boards, three basic principles apply:






will not allow a build up of moisture below the





the roof.

Celotex EL3000 with single-ply membrane

over concrete deck

Construction Concrete Concrete Steel Steel Timber Timber Deck Deck Deck Deck Deck Deck Fully Mechanically Fully Mechanically Fully Mechanically Bonded Fixed Bonded Fixed Bonded Fixed Thickness Thickness Thickness Thickness Thickness Thicknes

(mm) (mm) (mm) (mm) (mm) (mm)

Outside surface resistance - - - - - -

Single-ply membrane 1.5 1.5 1.5 1.5 1.5 1.5

Variable layer See below See below See below See below See below See below

VCL as BS6229:2003 - - - - - -

Concrete deck 250 250 n/a n/a n/a n/a

Steel deck n/a n/a 1.5 1.5 n/a n/a

Timber deck plywood n/a n/a n/a n/a 19 19

Cavity between joist at 11.7% bridging n/a n/a n/a n/a 150 150

Plasterboard n/a n/a n/a n/a 12.5 12.5

Inside surface resistance - - - - - -

Variable Layer Thickness U-value U-value U-value U-value U-value U-value

(mm) W/m2K W/m2K W/m2K W/m2K W/m2K W/m2K

Celotex EL3000 150 0.16 0.18 0.16 0.19 0.15 0.18

Celotex EL3000 140 0.17 0.20 0.17 0.20 0.16 0.19

Celotex EL3000 130 0.18 0.21 0.19 0.22 0.17 0.20

Celotex EL3000 120 0.20 0.23 0.20 0.23 0.19 0.22

Celotex EL3000 100 0.24 - 0.25 - 0.23 -

U-value calculation: EL3000 - single-ply membrane

T: 01473 820850 | celotex.co.uk | 61


Cold applied systems

For single-ply membranes, the VCL should be either

polythene or reinforced aluminium foil. The VCL should

be loose-laid immediately prior to installation of the

roof board and detailed at edges and abutments. The

VCL should be sealed and taped to the top surface of

the board.


The boards should be laid with all joints tightly butted

over the VCL and then mechanically secured through to

the deck. When used on metal decks, these roof boards

should be laid with the long edges at right angles to the

corrugations. When mechanical fasteners are utilised,

they should be selected to suit the type of deck used.

Celotex recommends the use of thermally broken

fi xings. Fixings must have a minimum 50mm head

or plate washer diameter. Fixings should be installed

between 50mm and 150mm from the edges and corners

of the board.

The exact number of fi xings required for each zone on a

fl at roof must be calculated by the use of either BS 6399:

Part 2: 1997 Code of Practice for Wind Loads, or EN1991-

1-4 used with the UK National Annex. A minimum of

six fi xings per board must be used. Where more than

six fi xings per board are required by the wind uplift

calculation, the higher fi gure must be adopted.

Guidance on fi xings and patterns can be sought from

fi xing manufacturers and in the BRUFMA information

document on mechanical fi xings for rigid PIR roofboards.

Installation of weathering systems

Diff erent types of weathering systems require diff erent

installation instructions and guidelines. Advice on

the installation of these weathering systems should


weathering system type.

Laying pattern

It is recommended that boards are laid with joints

break-bonded.

Supporting deck


for the VCL and insulation board with joints being

supported by the ridges of the deck. It must be capable

of supporting the static and dynamic design loads

and the loads associated with the construction activity

without defl ection in excess of the limits defi ned in BS

6399:Part1. The deck must be structurally sound, dry,

clean and, where necessary, primed before application

of the weathering and insulating system.

Traffi cking


associated with normal roof laying work. However, roofs

are generally designed for only occasional lightweight

foot traffi c or maintenance access. Where more frequent

or heavier access is required, protected walkways should

be provided. Under no circumstances should the roof

be used as a working platform, either during or after the

construction programme. Extra care should be taken to

protect the insulation and weathering when ballasting.


When the ballasting system is not installed immediately

following the application of loose-laid roof boards,

additional attachment is required. Please refer to

BRUFMA Information Document “Securing PIR &

PUR Roof Boards Beneath Single-Ply Waterproofi ng


Use of adhesives

When using adhesives, the installer should take care not

to use products that contain chemicals likely to attack

the insulating foam such as ketonic solvents. Celotex

EL3000 contains no chemicals or solvents likely to

damage the PVC membrane. When using adhesives, the

installer should check the compatibility of the adhesive

with the adhesive manufacturer.

Liquid applied membranes

If liquid applied membrane systems are being considered

for use with Celotex EL3000, advice on compatibility and

application procedures should be sought directly from

the manufacturer of the liquid applied system.

62 | T: 01473 820850 | celotex.co.uk

Celotex TA4000 with single-ply membrane

over concrete deck

Construction Concrete Concrete Steel Steel Timber Timber Deck Deck Deck Deck Deck Deck

Mechanically Thermally Mechanically Thermally Mechanically Thermally Fixed broken Fixed broken Fixed broken Thickness Thickness Thickness Thickness Thickness Thickness (mm) (mm) (mm) (mm) (mm) (mm)Outside surface resistance - - - - - - Single-ply membrane 1.5 1.5 1.5 1.5 1.5 1.5 Variable layer See below See below See below See below See below See belowPolythene 1000 gauge, VCL - - - - - - Concrete deck 250 250 n/a n/a n/a n/aSteel deck n/a n/a 1.5 1.5 n/a n/aTimber deck plywood n/a n/a n/a n/a 19 19Cavity between joist @ 11.7% Bridging n/a n/a n/a n/a 150 150 Plasterboard n/a n/a n/a n/a 12.5 12.5Inside surface resistance - - - - - -

Variable Layer Thickness U-value U-value U-value U-value U-value U-value (mm) W/m²K W/m²K W/m²K W/m²K W/m²K W/m²KCelotex TA4000 140 0.16 0.15 0.16 0.15 0.15 0.14Celotex TA4000 135 0.17 0.16 0.17 0.16 0.16 0.15Celotex TA4000 130 0.17 0.16 0.18 0.17 0.17 0.16Celotex TA4000 125 0.18 0.17 0.18 0.17 0.17 0.16Celotex TA4000 120 0.19 0.17 0.19 0.18 0.18 0.17Celotex TA4000 115 0.19 0.18 0.20 0.19 0.18 0.17Celotex TA4000 110 0.20 0.19 0.21 0.19 0.19 0.18Celotex TA4000 100 0.22 0.21 0.23 0.21 0.21 0.20Celotex TA4000 90 0.24 0.23 0.25 0.24 0.23 0.22Celotex TA4000 85 - 0.24 - 0.25 0.24 0.23

U-value calculation: TA4000 - single-ply membrane

Use Celotex TA4000 high performance insulation

in mechanically fi xed, single-ply fl at roofi ng systems

where the higher compressive strength of the board

gives improved resistance to site traffi c during

installation.

When designing a fl at roof using Celotex TA4000

boards, three basic principles apply:






will not allow a build up of moisture below the





the roof.

Single-ply membrane fl at roofi ng applications

T: 01473 820850 | celotex.co.uk | 63

Installation guidelinesLaying pattern

It is recommended that Celotex TA4000 boards are

laid with joints break-bonded. When used on metal

decks, the Celotex TA4000 boards should be laid with

the long sides at right angles to the corrugations.

Single-ply systems

Diff erent types of weathering system require diff erent

installation instructions and guidelines. Advice on

the installation of these weathering systems should


weathering system type.


The boards should be laid with all joints tightly butted

over the VCL and then mechanically secured through to

the deck. When mechanical fasteners are utilised, they

should be selected to suit the type of deck used. Celotex

recommends the use of thermally broken fi xings. Fixings

must have a minimum 50mm head or plate washer

diameter. Fixings should be installed between 50mm and

150mm from the edges and corners of the board.

The exact number of fi xings required for each zone on a

fl at roof must be calculated by the use of either BS 6399:

Part 2: 1997 Code of Practice for Wind Loads, or

EN1991-1-4 used with the UK National Annex. A

minimum of six fi xings per board must be used. Where

more than six fi xings per board are required by the wind

uplift calculation, the higher fi gure must be adopted.

Further guidance on fixings and patterns can be sought

from fi xing manufacturers and in the BRUFMA

information document on mechanical fi xings for rigid PIR

roofboards.

Traffi cking


associated with normal roof-laying work. However,

fl at roofs are generally only designed for occasional

lightweight foot traffi c for maintenance access. Where

more frequent or heavier access is required, protected

walkways should be provided. Under no circumstances

should the roof be used as a working platform, either

during or after the construction programme. Extra

care should be taken to protect the insulation and

weathering when ballasting.


When the ballasting system is not installed immediately

following the application of loose-laid roof boards,

additional attachment is required. Please refer to

BRUFMA Information Document “Securing PIR &

PUR Roof Boards Beneath Single-Ply Waterproofi ng


Vapour control layer (VCL)

The VCL should be minimum 1000 gauge polythene or

reinforced aluminium foil. This should be fully sealed

at all laps, prior to applying the insulation, using self-

adhesive tape appropriate to the type of VCL used.

At perimeters and abutments, the VCL should be

turned up around the insulation board edges and a fl ap

of approximately 300mm should be sealed and taped

to the top face of the board. The VCL should be loose-

laid immediately prior to the installation of the roof

insulation board.

Upstands

Where an insulated upstand is needed, Celotex TB4000,

GA4000 and XR4000 are suitable to meet this requirement.

Supporting deck


for the VCL and insulation board, with joints supported

by the ridges of the deck. The deck must be structurally

sound, dry, clean and, where necessary, primed before

application of the weathering and insulating system.

64 | T: 01473 820850 | celotex.co.uk64 | T: 0901 996 0100* | celotex.co.uk64 | T: 01473 820850 | celotex.co.uk64 | T: 01473 820850 | celotex.co.uk

T: 01473 820850 | celotex.co.uk | 65 T: 0901 996 0100* | celotex.co.uk | 65T: 01473 820850 | celotex.co.uk | 65

▶ Suspended timber fl oors

▶ Upgrading concrete slab fl oors

▶ Top up cavity walls

▶ Upgrading internal solid walls

▶ Upgrading external solid walls

▶ Timber frame wall lining and

dormer cheeks

▶ Pitched roof upgrades

▶ Insulating at ceiling level

▶ Flat roof upgrades

▶ Basements

▶ Loft conversions

▶ Garage conversions

T: 01473 820850 | celotex.co.uk | 65

Refurbishment insulation solutions

66 | T: 01473 820850 | celotex.co.uk


performance insulation in suspended timber fl oors to

minimise insulation thickness and give the following

benefi ts:

▶ Quick and easy to install insulation between

joists in one layer

▶ Boards permanently retained by Celotex

insulation clip

▶ Minimise air leakage by friction fi tting the insulation


buildings

▶ Minimal load added to structure due to

light weight boards

U-value calculation: ground fl oor – suspended timber

0.10

0.11

0.12

0.12

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.16

0.17

0.17

0.17

0.18

0.18

0.12

0.14

0.14

0.15

0.16

0.16

0.17

0.18

0.19

0.20

0.20

0.21

0.22

0.22

0.23

0.24

0.25

0.13

0.15

0.16

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.24

0.25

0.25

-

-

-

0.13

0.15

0.16

0.17

0.18

0.19

0.20

0.21

0.23

0.24

0.24

0.25

-

-

-

-

-

0.13

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.24

0.25

0.25

-

-

-

-

-

-

0.14

0.16

0.17

0.18

0.19

0.20

0.21

0.23

0.24

0.25

-

-

-

-

-

-

-

0.14

0.16

0.17

0.18

0.19

0.20

0.22

0.23

0.25

-

-

-

-

-

-

-

-

0.14

0.16

0.18

0.18

0.20

0.21

0.22

0.24

0.25

-

-

-

-

-

-

-

-

0.14

0.16

0.18

0.19

0.20

0.21

0.22

0.24

-

-

-

-

-

-

-

-

-

0.14

0.17

0.18

0.19

0.20

0.21

0.23

0.24

-

-

-

-

-

-

-

-

-

Celotex

Product

XR4200

XR4165

XR4150

XR4140

XR4130

XR4120

XR4110

GA4100

GA4090

GA4085

GA4080

GA4075

GA4070

GA4065

GA4060

GA4055

GA4050

Based on timbers joists @ 400 ctrs


0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Suspended timber fl oors

T: 01473 820850 | celotex.co.uk | 67

▶ Install joists in the conventional manner, with solid

or diagonal strut bracing as necessary. (NB: diagonal

bracing may lead to thermal bridging).

▶ The Celotex Insulation Clip is designed to allow

insulation boards to be installed between timber

joists quickly and without nails or screws.

▶ Either fi t the clips at one metre maximum centres

along the edge of the insulation or fi x battens to

the sides of the joists to support the insulation.


to achieve a tight fi t, then push the boards fi rmly

down between the joists. The insulation clip will

ensure a friction fi t.

▶ Insulate gaps between the joists and walls to

prevent thermal bridging.

▶ Install either chipboard or softwood fl oor boarding

directly onto the joists.

▶ Ensure that the void below the insulation is

ventilated.

Exposed fl oors (other than ground)

▶ For exposed or semi-exposed fl oors, e.g. garage or

car port ceilings, it may be easier to insulate from

below.

▶ Fix Celotex insulation boards directly to the

underside of the joists with galvanised clout

nails at 400mm maximum centres. Finish with an

appropriate fi re protection board fi xed to the soffi t.

▶ An additional layer of 100mm mineral wool

insulation can be installed between the joists,

supported by the soffi t lining, to provide acoustic

insulation.


also suitable for


68 | T: 01473 820850 | celotex.co.uk

U-value calculation: ground fl oor – concrete slab

0.07

0.07

0.08

0.08

0.08

0.09

0.09

0.09

0.09

0.10

0.10

0.10

0.11

0.11

0.11

0.12

0.12

0.12

0.08

0.09

0.10

0.10

0.11

0.11

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.17

0.17

0.18

0.09

0.10

0.11

0.11

0.12

0.12

0.12

0.13

0.14

0.15

0.16

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.09

0.10

0.11

0.12

0.13

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.09

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.19

0.19

0.20

0.21

0.22

0.24

0.25

0.09

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.16

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.25

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.19

0.19

0.20

0.21

0.22

0.24

0.25

-

-

0.10

0.11

0.12

0.13

0.14

0.15

0.15

0.16

0.17

0.19

0.20

0.21

0.22

0.23

0.24

0.25

-

-

0.10

0.12

0.13

0.13

0.14

0.15

0.15

0.16

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-


0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0Celotex Product

XR4200

XR4165

XR4150

XR4140

XR4130

FF4125

XR4120

XR4110

GA4100/FF4100

GA4090/FF4090

GA4085/FF4085

GA4080

GA4075/FF4075

GA4070/FF4070

GA4065

GA4060

GA4055

GA4050/FF4050

Upgrading concrete slab fl oors


FF4000 high performance insulation in concrete slab

fl oor upgrades to deliver the following benefi ts:


▶ Achieve compliance to Building Regulations whilst

ensuring thin solutions

▶ Quick and easy installation in one single layer of

insulation


▶ Provide reliable long term energy and cost savings

T: 01473 820850 | celotex.co.uk | 69

▶ Install a damp proof membrane over the top of

the slab. The damp proof membrane must provide

continuity with the damp proof course in the

surrounding walls.




rough, tamped slab to ensure that the insulation



slab with all joints tightly butted.

▶ Lay a polythene vapour control layer (VCL) over

the insulation to minimise the risk of condensation

forming at the insulation/slab interface.

▶ The chipboard must be minimum 18mm tongued




▶ Provide a 10mm–12mm gap at all perimeters and

abutments to allow for expansion. This can be

achieved by the use of temporary wedges.

▶ Where chipboard is butted together without

a tongued and grooved joint and all external

doorways (for the width of the threshold), a treated

timber batten must be used in lieu of the insulation

boards.



insulation.


also suitable for


70 | T: 01473 820850 | celotex.co.uk

Use Celotex PL4000 high performance insulation as a top

up upgrade to existing cavity walls to deliver the following

benefi ts:

▶ Upgrade existing walls to current Building Regulation

compliance levels

▶ Suitable for multiple installation techniques

▶ Provides a vapour control layer when board joints are

taped and jointed

▶ Provides reliable long term energy and cost savings

▶ Tapered edge plasterboard off ers the installer

maximum installation fl exibility and installation speed

U-value calculation: top up cavity walls using plasterboard thermal laminate

Construction


Brickwork

Cavity

Blockwork dense

Plaster dabs cavity

Variable layer

Board joints sealed to form VCL

Variable Layer

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

50mm 50mm Existing Existing clear cavity cavity fi lled with cavity wall cavity wall mineral wool insulated to insulated to

insulated to 0.45 (W/m²K) 0.35 (W/m²K)

0.60 (W/m2K) (1995 regulations) (2002 regulations)

- - - -

103 103 103 103

50 50 - -

100 100 100 100

15 15 15 15


- - - -

Thickness U-value U-value U-value U-value (mm) (W/m²K) (W/m²K) (W/m²K) (W/m²K)

65 + 12.5 0.27 0.21 0.18 0.17

60 + 12.5 0.29 0.22 0.19 0.17

55 + 12.5 - 0.23 0.20 0.18

50 + 12.5 - 0.24 0.21 0.19

45 + 12.5 - 0.26 0.22 0.19

40 + 12.5 - 0.27 0.23 0.20

25 + 12.5 - - 0.28 0.24

15 + 9.5 - - - 0.27

also suitable for


Top up cavity walls

T: 01473 820850 | celotex.co.uk | 71

Installation guidelinesInstallation guidelines for internal lining systems using direct bonding

▶ Ensure that existing walls are permeable. Strip any

gloss paint or vinyl wallpaper.

▶ Use the Celotex Insulation Saw to cut the 1200mm

x 2400mm Celotex PL4000 boards to fi t the fl oor-to-

ceiling height of the room.

▶ Ensure a continuous seal at skirting, ceiling level

and at openings by applying a continuous band of

gypsum adhesive. Gypsum adhesive at perimeter

edges can be replaced with thin timber battens.

▶ Apply further dabs of gypsum adhesive. This should

be in accordance with the adhesive manufacturer’s

instructions.

▶ Align sheets against the dabs and secure into correct

position.

▶ Once the dabs are set, it is recommended that

additional secondary fi xings be applied to the

Celotex PL4000. Exact fi xing details should be in

accordance with the recommendations of the fi xing

manufacturer.

▶ Joints between the boards must be tightly butted,

taped and jointed using appropriate tape and jointing

material to create the vapour control layer (VCL).

▶ Line window and door reveals with thinner Celotex

PL4000 boards.

▶ Please note that to avoid the load being directly

applied to the Celotex PL4000, suitable mechanical

fi xings should be used for other internal fi ttings.



▶ Please note that where existing walls are subject to the

ingress of excessive moisture, it is recommended that

Celotex PL4000 should be installed using mechanical

fi xings rather than a direct bonding technique.

Installation guidelines for internal lining systems using mechanical fi xings






▶ Secure Celotex PL4000 with suitable mechanical





jointing material to create the VCL.

▶ Line window and door reveals as for direct bonding

technique in adjacent column.

Installation guidelines for internal lining systems using mechanical fi xings to timber battens



▶ Fix treated softwood timber battens to the masonry.

They should be set out a maximum of 600mm

vertical centres to coincide with the edges of the

boards. As a minimum requirement, horizontal

battens should be used to support the top and

bottom of the board edges.




▶ Joints between the boards should be tightly butted

and fi nished by taping and jointing using appropriate

tape and jointing material to create the VCL.

Installation guidelines for internal lining systems using mechanical fi xings to metal lining systems

▶ Celotex PL4000 boards can be fi xed to a number

of proprietary metal frame lining systems. The

system should be fi xed in accordance with the

manufacturer’s instructions.

72 | T: 01473 820850 | celotex.co.uk

Upgrading internal solid walls

Internal insulation solutions

Use Celotex PL4000 high performance insulation in

solid masonry internal wall upgrades to deliver the


▶ Deliver better U-values and thinner solutions

compared to many other insulation materials

▶ Suitable for multiple installation techniques

▶ Provides a vapour control layer when board joints

are taped and jointed

▶ Certifi ed under BBA certifi cate number 12/4926

▶ Ofgem approved



maximum installation fl exibility and installation

speed

U-value calculation: internal solid walls


Brick

Cavity

Variable layer

Board joints sealed to VCL


Variable Layer

Celotex PL4000

Celotex PL4000

Dot and dab Direct fi x Timber Metal battens lining system

- - - -

215 215 215 215

15 - 25 25


- - - -

- - - - Thickness U-value U-value U-value U-value

(mm) (W/m²K) (W/m²K) (W/m²K) (W/m²K)

65 0.28 0.29 0.27 0.28

60 0.30 - 0.29 0.30

T: 01473 820850 | celotex.co.uk | 73

Installation guidelinesInstallation guidelines for internal lining systems using direct bonding



▶ Use the Celotex Insulation Saw to cut the

1200mm x 2400mm Celotex PL4000 boards to

fi t the fl oor-to-ceiling height of the room.

▶ Ensure a continuous seal at skirting, ceiling level

and at openings by applying a continuous band of

gypsum adhesive. Gypsum adhesive at perimeter

edges can be replaced with thin timber battens.

▶ Apply further dabs of gypsum adhesive. This should

be in accordance with the adhesive manufacturer’s

instructions.

▶ Align sheets against the dabs and secure into correct

position.

▶ Once the dabs are set, it is recommended that

additional secondary fi xings be applied to the

Celotex PL4000. Exact fi xing details should be in

accordance with the recommendations of the fi xing

manufacturer.


taped and jointed using appropriate tape and jointing

material to create the vapour control layer (VCL).

▶ Line window and door reveals with thinner Celotex

PL4000 boards to reduce the risk of thermal bridging.

Fix a batten around the edge of the opening and

scribe the board to fi t the reveal. Cut the dry lining

to suit and mechanically fi x into the masonry reveal

using proprietary fi xings. Finish using an angle fi llet

at the frame and an angle bead or scrim tape at

external corners.

▶ Please note that to avoid the load being directly

applied to the Celotex PL4000, suitable mechanical

fi xings should be used for other internal fi ttings.



▶ Please note that where existing walls are subject to the

ingress of excessive moisture, it is recommended that

Celotex PL4000 should be installed using mechanical

fi xings rather than a direct bonding technique.

Installation guidelines for internal lining systems using mechanical fi xings











jointing material to create the VCL.

▶ Line window and door reveals as for direct bonding

technique in adjacent column.

Installation guidelines for internal lining systems using mechanical fi xings to timber battens



▶ Fix treated softwood timber battens to the masonry.

They should be set out a maximum of 600mm

vertical centres to coincide with the edges of the

boards. As a minimum requirement, horizontal

battens should be used to support the top and

bottom of the board edges.




▶ Joints between the boards should be tightly butted

and fi nished by taping and jointing using appropriate

tape and jointing material to create the VCL.

Installation guidelines for internal lining systems using mechanical fi xings to metal lining systems

▶ Celotex PL4000 boards can be fi xed to a number

of proprietary metal frame lining systems. The

system should be fi xed in accordance with the

manufacturer’s instructions.

74 | T: 01473 820850 | celotex.co.uk

U-value calculation: external solid masonry wall

Construction Thickness (mm) Outside surface resistance - Render 20

Variable layer See below Brickwork 215 Plaster, lightweight 13 Inside surface resistance -

Variable Layer Thickness U-value (mm) W/m²KCelotex SW3000 100 0.23*Celotex SW3000 80 0.28**Assumes thermally broken fi xings

Use Celotex SW3000 in solid masonry external wall

upgrades to deliver the following benefi ts:


▶ Directly render to insulation with no requirement

for separate render boards or batten systems

▶ Particularly suited to refurbishment projects

▶ Provides a highly effi cient insulation solution

without impacting on internal living space


Upgrading external solid walls

T: 01473 820850 | celotex.co.uk | 75

▶ Prior to installation of the Celotex insulation boards,

the substrate must be checked for soundness.

▶ Large, uneven projections should be removed and

all holes fi lled and levelled. Loose materials should

be cleaned off to leave a sound, dry surface.

▶ Downpipes should be temporarily removed and, if

necessary, relocated after completion of installation.

Lengthening of overfl ow pipes should be allowed

for, together with extension to sills.

▶ Celotex SW3000 should be installed with the

perforated facer facing outwards to accept the

render system.

▶ SW3000 should be fi xed to the substrate using

proprietary fasteners, which are driven into

pre-drilled holes.

▶ SW3000 should be fi tted with a minimum of 5

fi xings per board. One fi xing should be located

towards each corner of the board with one fi xing in

the centre of each board. Fixings should be installed

between 50mm – 150mm from the corners and

edges of the board. Fixings must not be installed

through board joints.

▶ All insulation board joints should be tightly butted

and end joints staggered.

▶ The render systems should then be applied in

accordance with manufacturer’s guidelines.


76 | T: 01473 820850 | celotex.co.uk

Single timber frame wall lining anddormer cheeks

Construction

Outside surface resistanceWeatherboard - Tiles - Rendered - Code 4 leadVentilated cavity batten air spaceBreather membranePlywoodCelotex between 100mm studs @ 400 ctrs (11.7% brg)Low E cavity between studs @ 400 ctrs (15% brg)Variable layer (for over studs)Inside surface resistance

Variable Layer

Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000Celotex PL4000

Weatherboarding Tile Hung Rendered Lead Clad Thickness Thickness Thickness Thickness (mm) (mm) (mm) (mm) - - - - any any 20 1.8 25 n/a 25 25 - - - - 12 12 12 12† GA4060 GA4060 GA4060 GA4060 40 40 40 40 See below See below See below See below - - - -

Thickness U-value U-value U-value U-value (mm) (W/m²K) (W/m²K) (W/m²K) (W/m²K) 65 + 12.5 0.17 0.17 0.17 0.17 60 + 12.5 0.18 0.18 0.18 0.18 55 + 12.5 0.19 0.19 0.19 0.19 50 + 12.5 0.19 0.19 0.19 0.20 45 + 12.5 0.20 0.20 0.20 0.21 40 + 12.5 0.21 0.21 0.21 0.22 25 + 12.5 0.25 0.25 0.25 0.26 15 + 9.5 0.29 0.29 0.29 0.30

GA = Celotex GA4000Low E = Low emissivity† When using lead clad, the plywood layer is moved to outside the ventilated batten airspace

U-value calculation: single timber frame wall

Rendered

Use a combination of Celotex GA4000 with Celotex

PL4000 high performance insulation in single timber

frame wall lining applications to minimise insulation


▶ Provides both the over stud insulation and

plasterboard in one product, helping reduce

installation time

▶ Off ers the installer maximum fl exibility and

installation speed due to the tapered edge

plasterboard


compared to many other insulation materials

▶ Provides reliable long-term energy savings

for buildings

T: 01473 820850 | celotex.co.uk | 77


projections, and that services are correctly installed.

▶ Fit Celotex insulation tightly in-between all studs

and push up to plywood sheathing.


foil surface should face the air cavity within the

studwork.

▶ Use the Celotex Insulation Saw to cut the boards for

infi ll panels, using off -cuts where possible, making

sure there are no air gaps at wall abutments.

▶ Install Celotex PL4000 insulation over the studs.

Secure Celotex PL4000 with suitable mechanical



▶ Tightly butt edges of boards together, making sure

there are no gaps and fi x back to solid timber, both

at stud lines and at top and bottom rails.



jointing material to create the vapour control layer

(VCL).

▶ Vapour seal all perimeter abutments using sealant.

▶ Seal around all penetrations for electrical outlets

and switch boxes.







09/4667.


Weatherboarding



78 | T: 01473 820850 | celotex.co.uk

Pitched roof upgrades

Between and under raftersUse a combination of Celotex GA4000 or Celotex XR4000

with Celotex PL4000 high performance insulation in

pitched roof between and under rafter applications to

minimise insulation thickness and give the following

benefi ts:

▶ Celotex PL4000 provides both the below rafter

insulation and plasterboard in one product, helping

reduce installation time



▶ Ideal for use with shallow rafters


buildings



▶ Upgrade existing ceilings to current standards

For installation guidelines please see pages 54 and 55.

Construction

Outside surface resistanceTiling including batten spaceSarking feltVentilated cavityCelotex between rafters @ 400 ctrs (11.7% brg)Variable layer (for below rafters)Inside surface resistance

Variable Layer


GA = GA4000 XR = XR4000

100mm 125mm 150mm 175mm deep rafters deep rafters deep rafters deep rafters Thickness Thickness Thickness Thickness (mm) (mm) (mm) (mm) - - - - - - - - - - - - 50 50 50 55 GA4050 GA4075 GA4100 XR4120 See below See below See below See below - - - -


U-value calculation: ventilated between and under rafters

Insulation between and under rafters can also be used without a ventilated cavity. Please see page 54 and 55 of the Handy Guide.

also suitable for


T: 01473 820850 | celotex.co.uk | 79

Construction

Outside surface resistanceTiling including batten spaceBreather membraneLow E cavity, remainder of rafter depthVariable layer (for between rafters)Polythene, 1000 gauge VCLPlasterboardInside surface resistance

Variable Layer

Celotex XR4000 @ 400 ctrsCelotex XR4000 @ 400 ctrsCelotex XR4000 @ 400 ctrsCelotex XR4000 @ 400 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrsCelotex XR4000 @ 600 ctrs

200 mm deep rafters 175 mm deep rafters 150 mm deep rafters Thickness (mm) Thickness (mm) Thickness (mm) - - - - - - - - - Various Various Various See below See below See below - - -

12.5 12.5 12.5 - - - Thickness U-value U-value U-value (mm) (W/m²K) (W/m²K) (W/m²K) 200 0.17* - - 165 0.18 0.19* - 150 0.19 0.20 - 140 0.20 - - 200 0.15* - - 165 0.17 0.17* - 150 0.18 0.18 0.20* 140 0.19 0.19 0.20* 130 0.20 0.20 0.20

U-value calculation: unventilated between rafters

* = Counter batten over membrane - see installation guidelines

Between raftersUse Celotex XR4000 high performance insulation in between



▶ Optional single-layer insulation reduces cutting


▶ Easy to dry line with plasterboard once installed


▶ No loss of internal headroom



also suitable for


80 | T: 01473 820850 | celotex.co.uk


performance insulation in top up joist upgrades to

deliver the following benefi ts:

▶ Upgrade existing roof spaces to current Building

Regulation compliance levels

▶ Provide energy effi cient insulation measures

without impacting on internal space

▶ Insulating over joists provides a lightweight storage

solution when insulation fi xed into joists

▶ Minimal load added to the structure due to

lightweight boards

Construction 100mm deep joists 150mm deep joists Thickness (mm) Thickness (mm)Outside surface resistance - - Tiling including batten space - - Loft space - - Variable layer over joists - - Mineral wool between joists @ 400 ctrs 100 150 Polythene VCL - -Plasterboard 12.5 12.5 Inside surface resistance - -

Variable Layer Thickness U-value U-value (mm) W/m²K W/m²KCelotex XR4000 130 0.12 0.11Celotex XR4000 120 0.13 0.11Celotex XR4000 110 0.14 0.12Celotex GA4000 100 0.14 0.13Celotex GA4000 90 0.15 0.13Celotex GA4000 85 0.16 0.14Celotex GA4000 80 - 0.14Celotex GA4000 75 - 0.15Celotex GA4000 70 - 0.15Celotex GA4000 65 - 0.16Celotex GA4000 60 - 0.16

VCL = Vapour control layer

U-value calculation: insulating at ceiling level

Insulating at ceiling level

T: 01473 820850 | celotex.co.uk | 81

▶ Celotex can be used to top up insulation levels

in a horizontal ceiling when mineral wool exists

between the joists.

▶ Ensure the loft void is ventilated and eave vents are

left clear.

▶ Ensure ceilings are strong enough to withstand

loadings associated with installation.

▶ To minimise air leakage and heat loss around the

loft hatch, seal the edges with draught seals and

mechanically fi x Celotex TB4020 to the inside of the

hatch.

▶ Ensure existing insulation between joists is in good

condition, with no signs of sagging.

▶ Celotex is laid directly over the joists as a

continuous layer.

▶ For maximum strength Celotex should be laid in

the opposite direction to that of the ceiling joists.

Ensure boards are laid across a minimum of two

joists.

▶ Board joints are tightly butted together correctly

supported by the joists.

▶ Celotex is then mechanically fi xed to the joists with

suitable fi xings.

For light storage only

▶ Lay 18mm of plywood over the Celotex and secure

into the ceiling joists with suitable fi xings.


also suitable for


82 | T: 01473 820850 | celotex.co.uk

U-value calculation: cold fl at roof - between and under joists

Construction

Outside surface resistanceWeatherproofi ng systemPlywoodVentilated cavityCelotex between joists @ 400 ctrs (11.7% brg)Variable layer (for below joists)Inside surface resistance

Variable Layer


GA = GA4000 XR = XR4000

100mm 125mm 150mm 175mm deep joists deep joists deep joists deep joists Thickness Thickness Thickness Thickness (mm) (mm) (mm) (mm) - - - - n/a n/a n/a n/a 19 19 19 19 50 50 50 55 GA4050 GA4075 GA4100 XR4120 See below See below See below See below - - - -


Insulation between and under joistsUse a combination of Celotex GA4000 or Celotex XR4000

with Celotex PL4000 high performance insulation in fl at

roof between and under joist applications to minimise


▶ Celotex PL4000 provides both the below joist insulation

and plasterboard in one product helping reduce

installation time



▶ A perfect solution to upgrade older buildings


for buildings

▶ No need to remove existing weatherproofi ng covering

▶ Ventilated cold roof construction

▶ The ideal renovation/conversion solution

▶ Helps to minimise any loss of internal headroom

Flat roof upgrades

T: 01473 820850 | celotex.co.uk | 83


▶ Make sure that there is enough joist depth to


insulation, but also a 50mm ventilated airspace

above the boards.

▶ Fix battens to the inside face of the joists so that the

bottom of the batten is 50mm below the decking.


face of the joists prior to cutting the board.

▶ The Celotex Insulation Clip is designed to allow

insulation boards to be installed between timber

joists quickly and without nails or screws.

▶ Fit the clips at one metre maximum centres along

the insulation.

▶ Push the boards into the void between the joists

until they are tight up to the underside of stop

battens, ensuring that the lateral joints are tightly

butted.






jointing material to create the vapour control layer.

Composite systems can be used to combine Celotex

insulation under joist lining with quilt type insulant

between the joists which will provide acoustic, as

well as thermal, insulation. This option is particularly

useful when upgrading to modern acoustic insulation

standards.

When updating an existing ceiling, Celotex PL4000

can be fi tted directly underneath the ceiling, providing

there is no vapour check layer such as gloss paint or

foil backed plasterboard. Always ensure that there is

a 50mm minimum ventilation gap above any original

insulation.

Ventilation must be provided above an insulated

ceiling directly through the cold void. Failure to do so

could result in serious condensation problems that may

lead to decay and possible failure.



84 | T: 01473 820850 | celotex.co.uk

Flat roof insulating deck

U-value calculation: warm fl at roof – insulating deck

Construction Celotex TD4000 - BUR Celotex TD4000 - SPM Thickness (mm) Thickness (mm) Outside surface resistance - - Built-up roofi ng or single-ply membrane 12 1.5 [see note] Plywood n/a 12

Variable layer See below See below Cavity between joist @ 400 ctrs -11.7% 150 150 Plasterboard 12.5 12.5 Inside surface resistance - -

Variable Layer Thickness U-value U-value (mm) W/m²K W/m²KCelotex TD4000 126 0.18 0.18Celotex TD4000 116 0.19 0.19Celotex TD4000 106 0.21 0.21Celotex TD4000 96 0.22 0.23

BUR = Built-up roofi ngSPM = Single-ply membraneNote: Prior to weatherproofi ng the roof, check with the single-ply membrane manufacturer that the proposed weathering system is suitable for use with this type of construction.

Use Celotex TD4000 to combine high performance

insulation in fl at roof deck applications to minimise


▶ Three-in-one product to provide deck, vapour

control layer (VCL) and insulation


for buildings

▶ Ideal for use in occasionally traffi cked applications

▶ Warm roof construction due to over joist installation

▶ Rapidly installed and weatherproofed

▶ Accepts a wide variety of weathering systems

Please note that if the existing weatherproof cover is

being replaced, Celotex TA4000, EL3000 or TC3000 is

also suitable for this application. For further details of

these installations, please refer to pages 58-61 of this

Handy Guide or contact the Celotex Technical Centre.

T: 01473 820850 | celotex.co.uk | 85

▶ Ensure that joist spacing is at no more than 600mm

centres and that the dimension of the joist is

suffi cient to span and accept additional loads. If

asphalt weathering is to be used, joists should be at

no more than 400mm centres.

▶ Install the insulation boards, ensuring that the long

edges are parallel to the line of the joists. 50mm x

50mm cross noggings should be inserted between

joists to support the short edges of the boards.

▶ Where boards butt together, bed onto twin beads

of vapour sealant wide enough to accommodate

this arrangement. This completes the vapour

control layer (VCL) when combined with each

board’s foil facings.

▶ Lay the boards with the plywood side uppermost

and stagger board joints. Leave a gap of

approximately 2mm between boards and ensure a

minimum 20mm bearing on joists and noggins.

▶ Fix Celotex TD4000 with corrosion-proof Suretwist

Composite Panel helical fasteners at a frequency

to suit the design wind load. Refer to BS 6399-2

Code of Practice for Wind Loads. A minimum of

16 fasteners per board will resist a wind load of

2.22 KN/m2 based on a design load of 0.4KN per

fastener.

▶ Ensure that fi xings are no less than 10mm in from

the board edge or 50mm from each corner. They

should be equally spaced along the supporting

joists. Fixings should be long enough to penetrate

at least 38mm into the supporting timber.

▶ Stagger opposing fi xings where two board edges

share the same joist or noggin.

▶ Provide a complete insulation envelope by

extending the wall insulation board up to the

underside of the roof deck.

▶ Provide a soffi t or ceiling below the joists, as the

surface of the product is not designed to be used as

a decorative internal fi nish.

▶ Ensure that the plywood is completely dry before

any weathering system is applied.

▶ Always use a Type 3G felt to BS 747 as a vapour

diff usion fi rst layer when using BUR weathering

systems. When using a single-ply membrane,

additional 12mm plywood has to be applied on top

of the Celotex TD4000.

▶ Temporary protection must be provided for both

the insulation and the waterproofi ng, if signifi cant

foot traffi c is anticipated either during or after

installation.

Falls

The structure should be designed so that the fi nished

roof has a continuous, smooth and even slope towards

the rainwater outlet or gutter. The minimum fall

should be 1:80 to avoid ponding water.

Deck stability

Celotex TD4000 incorporates exterior grade WBP

plywood to BS 1203, laminated to the surface. This

gives the product excellent strength. Boards can

span up to 600mm joist centres to provide a suitable

substrate for a variety of weathering systems.

Vapour control layer

Celotex TD4000 has a built-in VCL due to the board’s

foil facer, but this is discontinuous at the board joints.

Therefore, a twin bead of vapour sealant should be

applied to the top of the supporting joists and noggins

at all board joints. This completes the VCL when

combined with each board’s foil facers.

86 | T: 01473 820850 | celotex.co.uk


Use Celotex TB4000, Celotex GA4000, Celotex

XR4000 or Celotex FF4000 and Celotex PL4000 high

performance insulation in basement refurbishment

projects to deliver the following benefi ts:

▶ Upgrade basements to current Building Regulation

compliance levels

▶ Create additional, highly thermal effi cient

living space


maximum installation fl exibility and installation

speed

▶ Provides reliable long term energy and cost savings

Basements

U-value calculation: basement fl oors


0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0Celotex Product

XR4150/FF4150

XR4140

XR4130

FF4125

XR4120

XR4110

GA4100/FF4100

GA4090/FF4090

GA4085/FF4085

GA4080

GA4075/FF4075

GA4070/FF4070

GA4065

GA4060

GA4055

GA4050/FF4050

TB4045

TB4040

TB4035

TB4030

TB4025

TB4020

0.07

0.08

0.08

0.08

0.08

0.08

0.09

0.09

0.09

0.10

0.10

0.10

0.10

0.11

0.11

0.11

0.12

0.12

0.12

0.13

0.13

0.14

0.09

0.09

0.10

0.10

0.10

0.11

0.11

0.12

0.12

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.16

0.17

0.18

0.19

0.19

0.20

0.10

0.10

0.11

0.11

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.17

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.25

0.10

0.11

0.11

0.12

0.12

0.13

0.14

0.14

0.15

0.16

0.16

0.17

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

0.11

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-

-

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.17

0.17

0.18

0.19

0.20

0.20

0.21

0.23

0.24

0.25

-

-

-

-

0.11

0.12

0.13

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-

-

-

0.11

0.12

0.13

0.13

0.13

0.14

0.15

0.17

0.17

0.18

0.19

0.19

0.20

0.21

0.22

0.24

0.25

-

-

-

-

-

0.11

0.12

0.13

0.13

0.14

0.16

0.16

0.17

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.25

0.24

0.25

-

-

-

-

T: 01473 820850 | celotex.co.uk | 87

Celotex requirement to meet target U-values for a

basement fl oor are determined by a number of

variable factors.

▶ Type of surrounding retaining soil. This can be

clay/ silt or sand/ gravel or rock

▶ The thickness of basement walls

▶ The height of basement walls from fi nished fl oor

level to ground level

▶ The ratio of exposed fl oor perimeter to the total

fl oor area. ( PA ratio).

In addition to the above, basement walls take into

account the thermal performance of the basement

fl oor. Please contact the Celotex Technical Centre to

confi rm which boards meet target U-values.


Basement fl oors – Above concrete slab

▶ The surface of the slab should be smooth, fl at and

free from projections. If required use a thin layer

of sand blinding on a rough slab to ensure the

insulation boards are continuously supported.

▶ Ensure the basement fl oor is protected from

external ground water penetrating the fl oor with a

suitable waterproof system.





board joints.

▶ 20mm TB4000 is positioned around the exposed

perimeter as an upstand. It is usually the depth of

the screed.

▶ Apply a 65mm sand cement screed in accordance

with manufacturers instructions.

Basement walls

▶ Ensure the basement wall is protected from

external ground water penetrating the wall with a

suitable waterproof system.

▶ Following manufacturer guidelines to maintain

waterproof seal, fi x 25mmx47mm battens to the

masonry at 600mm vertical centres to coincide

with the board edges with suitable fi xings.




▶ Joints between the boards should be tightly

butted and fi nished by taping and jointing using

appropriate tape and jointing material to create

the VCL.

also suitable for


88 | T: 01473 820850 | celotex.co.uk

Loft conversions

U-value calculation: attic walls

Construction Thickness (mm) Outside surface resistance - Tiling including batten space -Breathable membrane -Roof void -Celotex GA4000 80Cavity (low emissivity) between studwork 20

Variable layer See below Board joints sealed to form vapour barrier - Inside surface resistance -

Variable Layer Thickness U-value (mm) W/m²KCelotex PL4000 65 + 12.5 0.16Celotex PL4000 60 + 12.5 0.17Celotex PL4000 55 + 12.5 0.17Celotex PL4000 50 + 12.5 0.18Celotex PL4000 45 + 12.5 0.19Celotex PL4000 40 + 12.5 0.20Celotex PL4000 25 + 12.5 0.23Celotex PL4000 15 + 9.5 0.26

Use Celotex GA4000 and Celotex PL4000 high

performance insulation in loft conversion projects to

deliver the following benefi ts:

▶ Upgrade lofts to current Building Regulation

compliance levels


living space


▶ Deliver multiple energy effi cient measures within

one project

Installation guidelines▶ For optimum thermal performance, the unprinted


▶ Celotex GA4000 is cut and friction fi tted between

timber frame fl ush with the back of the studwork

leaving a 20mm gap in front for services.






appropriate tape and jointing material to create the

VCL.

Attic walls

T: 01473 820850 | celotex.co.uk | 89

Between and under rafters

Construction 100mm joists 150mm joists Outside surface resistance - - Tiling including batten space - - Loft space - - Celotex between joists @ 400 ctrs GA4090 XR4140Variable layer See below See below Board joints sealed to form vapour barrier - - Inside surface resistance - - Variable Layer Thickness U-value U-value (mm) W/m²K W/m²KCelotex PL4000 65 + 12.5 0.16 0.13Celotex PL4000 60 + 12.5 - 0.13Celotex PL4000 55 + 12.5 - 0.14Celotex PL4000 50 + 12.5 - 0.14Celotex PL4000 45 + 12.5 - 0.15Celotex PL4000 40 + 12.5 - 0.15

U-value calculation: horizontal ceiling

Installation guidelines▶ Celotex GA4000 or XR4000 is cut and friction fi tted

between horizontal ceiling joists which form the

fl at ceiling of the new loft room.







the VCL.


Horizontal ceiling

also suitable for


Loft insulation

90 | T: 01473 820850 | celotex.co.uk

U-value calculation: concrete slab fl oor

0.07

0.07

0.08

0.08

0.08

0.09

0.09

0.09

0.09

0.10

0.10

0.10

0.11

0.11

0.11

0.12

0.12

0.12

0.08

0.09

0.10

0.10

0.11

0.11

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.15

0.16

0.17

0.17

0.18

0.09

0.10

0.11

0.11

0.12

0.12

0.12

0.13

0.14

0.15

0.16

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.09

0.10

0.11

0.12

0.13

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.09

0.11

0.12

0.12

0.13

0.13

0.14

0.15

0.16

0.17

0.18

0.19

0.19

0.20

0.21

0.22

0.24

0.25

0.09

0.11

0.12

0.13

0.13

0.14

0.14

0.15

0.16

0.18

0.18

0.19

0.20

0.21

0.22

0.23

0.25

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

0.10

0.11

0.12

0.13

0.14

0.14

0.15

0.16

0.17

0.19

0.19

0.20

0.21

0.22

0.24

0.25

-

-

0.10

0.11

0.12

0.13

0.14

0.15

0.15

0.16

0.17

0.19

0.20

0.21

0.22

0.23

0.24

0.25

-

-

0.10

0.12

0.13

0.13

0.14

0.15

0.15

0.16

0.18

0.19

0.20

0.21

0.22

0.23

0.24

-

-

-


0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Based on 18mm tongue and groove chipboard

Celotex Product

XR4200

XR4165

XR4150

XR4140

XR4130

FF4125

XR4120

XR4110

GA4100/FF4100

GA4090/FF4090

GA4085/FF4085

GA4080

GA4075/FF4075

GA4070/FF4070

GA4065

GA4060

GA4055

GA4050/FF4050

Garage conversions

Use Celotex GA4000, Celotex XR4000, Celotex

PL4000 and Celotex TD4000 high performance

insulation in garage conversion projects to deliver the


▶ Upgrade to current Building Regulation

compliance levels


living space


▶ Deliver multiple energy effi cient measures within

one project

For installation guidelines please see page 67.

Upgrading concrete slab fl oor

T: 01473 820850 | celotex.co.uk | 91

▶ Ensure any non-breathable coverings are removed,

eg vinyl wallpaper or gloss paint.

▶ To prevent external moisture crossing over to the

inner lining install a breathable membrane against

the wall according to manufacturer’s instructions.

▶ Fix with suitable fi xings 25mmx47mm battens to

the masonry at 600mm vertical centres to coincide

with the board edges. Specifi c advice on suitable

fi xings should be sourced directly from the fi xing

manufacturer.







the VCL.


U-value calculation: solid brick wall

Construction Thickness (mm)

Outside surface resistance -

103 solid brick wall 103

Breathable membrane -

Cavity between battens 25

Variable layer See below

Board joints sealed to form VCL -

Inside surface resistance -

Variable Layer Thickness U-value

(mm) W/m²K

Celotex PL4000 65 + 12.5 0.29

Celotex PL4000 60 + 12.5 0.30

Solid brick wall

also suitable for


Garage insulation

92 | T: 01473 820850 | celotex.co.uk

Construction


Weatherproofi ng system

Plywood

Ventilated cavity

Celotex between joists @

400 ctrs (11.7% brg)

Variable layer (for below joists)


Variable Layer

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

Celotex PL4000

GA = GA4000

XR = XR4000

Thickness Thickness Thickness Thickness

(mm) (mm) (mm) (mm)

- - - -

n/a n/a n/a n/a

19 19 19 19

50 50 50 55

GA4050 GA4075 GA4100 XR4120


- - - -

65 + 12.5 0.20 0.17 0.15 0.14

60 + 12.5 - 0.18 0.16 0.14

55 + 12.5 - 0.19 0.16 0.15

50 + 12.5 - 0.20 0.17 0.15

45 + 12.5 - - 0.18 0.16

40 + 12.5 - - 0.19 0.17

25 + 12.5 - - - 0.19

Garage conversions

For full installation guidelines please see pages 82

and 83. Please note that Celotex also off er solutions

if the existing weatherproof cover is being replaced.

For further information please contact the Celotex

Technical Centre.

also suitable for


T: 01473 820850 | celotex.co.uk | 93

Storage

▶ Celotex insulation boards should be stored dry,

fl at and clear of the ground. Only as much material

as can be installed during a single working period

should be removed from storage at any one time. If

boards are stored under tarpaulins, care should be

taken to prevent rope damage to boards.

Installation

▶ Always install Celotex insulation boards in

accordance with the instructions supplied by

Celotex.

▶ Celotex insulation boards should not be installed

when the temperature is at or below 4°C and falling.



▶ Where possible, cut the product using the Celotex

Insulation Saw to minimise dust creation.

▶ When cutting Celotex insulation, dust extraction

equipment, eye protection and face masks should

be provided. Dust or particles in the eyes should be

washed out with liberal quantities of water. If skin is

sensitive to fi bre irritation, apply a barrier cream to

exposed areas before handling.

Handling

▶ Care should also be taken to ensure that packs are

not dropped on to corners or edges.

▶ Aluminium foil edges may be sharp. Avoid sliding

bare hands along board edges.

For a downloadable copy of our Health & Safety

guidelines, please visit the website at celotex.co.uk

Waste management and recycling

Celotex continually monitors the levels of waste from its

activities and drives and implements procedures which

reduce the amount of waste produced. The company

ensures that all employees are aware of the importance

of reducing waste in all activities.

The majority of Celotex products are packaged without

the requirement for shrink wrap and instead use

recyclable materials such as cardboard banding.

Waste PIR is inert and landfi ll safe with no known eff ect

on ground water. Glass fi bre used as core reinforcement

in certain products is made up almost entirely from

recycled waste glass.

Celotex’ environmental impact has been assessed via

a BRE Environmental Profi le. This profi le drives our

A+ Green Guide rating and considers the full ‘cradle

to grave’ impact including raw material extraction,

manufacture, transportation, performance in use and

disposal.

For further information on the Sustainability credentials

of Celotex including a copy of our Environmental &

Sustainability Statement, please visit the ‘Sustainability’

pages of celotex.co.uk

General informationGarage insulation

94 | T: 01473 820850 | celotex.co.uk

Notes

Characteristics, properties or performance of materials described herein are derived from data obtained under controlled test conditions. Celotex Limited makes no warranty, express or implied as to their characteristics under any variations from such conditions in actual constructions.

All products are supplied subject to our standard terms and conditions of sale, a copy of which is available on request.

Typical details shown in this brochure are provided for guidance only and are not to scale. Celotex Limited makes no warranty, express or implied as to the suitability of such details for any particular project. It is the responsibility of the designer to ensure that any design or construction details used are suitable for the project, having due regard to the environmental and structural factors which are beyond the control of Celotex Limited.

Notwithstanding the foregoing, nothing herein stated shall exclude or restrict:

1. The liability of Celotex Limited in respect of death or personal injury pursuant to the relevant provisions of the Unfair Contract Terms Act 1977, or

2. The liability of Celotex Limited in respect of any damage caused by a defect to the extent that such comes within the relevant provisions of the Consumer Protection Act 1987.

Lines are open Monday – Friday from 8:00am – 5:15pm.Details and pricing are correct at date of publication – January 2013.

T: 01473 820850 | celotex.co.uk | 95

T: 01473 820850 F: 01473 820889

Contact us at celotex.co.uk

T: 01473 820820 F: 01473 828857 E: [email protected]

twitter.com/celotex

Lady Lane Industrial Estate Hadleigh Ipswich Suff olk IP7 6BA

Registered in England No. 2183896

Celotex. Refurbishing Britain.

At Celotex we are working towards improving energy effi ciency and reducing carbon emissions of Britain’s housing stock.

With our new Green Deal ready solutions, suited particularly for solid wall upgrades, Celotex continues to off er new and innovative

ways of meeting carbon reduction targets as well as your design

needs.

With industry leading insulation performance, supported with BBA

certifi cation, specifying Celotex will deliver even better U-values

and thinner solutions; ideal for optimising your space.

For more information on how you can help us refurbish Britain

please visit refurbishingbritain.co.uk


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