Meet the demands with theoup -...

1

Part L 2010Guide for Compliance (England & Wales)

Meet the demands

with the

Travis Perkins Group

2

Welcome to the Travis Perkins Group

Travis Perkins plc is a leading company in the builders’ merchant and home improvement markets, and is a main supplier to the building and construction market, one of the largest industries in the UK.

The group operates 19 businesses from more than 1,700 sites across the UK, which offer a wide range of products and services.

Our Group Mission“Continue to deliver better return by…putting in place and growing the best businesses, with outstanding people and operations, providing comprehensive building solutions, to everyone creating, maintaining, repairing or improving the built environment…helping to build Britain”.

2

3

Our Group Values

At Travis Perkins we:Know our customers We understand their needs, beat their expectations, treat them with respect and know our major customers personally.

Like to deliver We enjoy being the best; we know exactly what each of us is expected to achieve; we focus on getting results, simply.

Talk and listen We say what we mean clearly and honestly, we listen carefully; we respond objectively, we explain our decisions.

Work together We actively work with each other; when something goes wrong, the first thing we will do is fix the problem, not look for someone to blame.

Are with you, not against you We seek mutual benefits with all stakeholders; we think about the impact of our actions; we search for similarities.

Always try to get better We constructively challenge, we use our common sense.

Know how to do our jobs Not just today, but for the next job; we equip ourselves with the skills needed to perform and be confident we can perform.

Are proud to be here This is a great company; everyone working with us is welcome; we make work enjoyable for everyone.

3

4

PART LA guide to conservation offuel and power brought to youby the Travis Perkins GroupThe aim of Part L is to cut carbon emissions through savings in the energy needed to heat, cool, ventilate, light, and supply hot water to, new buildings. This easy-to-read, handy guide shows you how to achieve this, and how Part L affects your work and the products and supplies you use. It shows you how you can meet the legislative demands working with the Travis Perkins Group and how we can help you along the road to zero carbon construction.

Welcome to your copy of

5

Contents Section 108 Introduction09 Explanation of SAP 2009 – the ‘whole house approach’10-15 Demonstrating Compliance Reducing Energy Demands Party Wall requirements Air Permeability Thermal Bridging15 Implementation date and related timescale

Section 218 Compliance Solutions through improvements to the Building Fabric Manufacturer Guidance – typical targets19-23 Walls Masonry: Cavity & Solid Party Wall24-27 Floors Beam & Block28-30 Roofs Cold Warm31 Lighting

Section 3 34 Compliance Advise using Renewable Technologies34-35 Brief Explanation of Products

Section 438 Other Key Products to Consider39 Accredited Details40 Historic Buildings40 Extensions41 Conservatories42-43 Cavity Wall Areas requiring insulation to be Partially Filled only by NHBC 44 Insulation Material Thermal Performance Table44 Building Block Thermal Performance Table

Glossary48 Terms used in this Guide53 Our Businesses

7

08 Introduction

09 Explanation of SAP 2009 – the ‘whole house approach’

10-15 Demonstrating Compliance Reducing Energy Demands Party Wall requirements Air Permeability Thermal Bridging

15 Implementation date and related timescale

Section 1

8

IntroductionThis latest version of Part L seeks to reduce fossil fuel consumption and cut down the emissions of carbon dioxide from a new building by reducing the amount of energy needed to heat, cool, ventilate and light it and supply hot water.

This requirement is referred to as the TER (target emissions rate) and the stated aim is to improve the correlation between the predicted and actual emissions performance, the DER (dwelling emissions rate), and subsequently not exceed the TER.

The Part L 2010 update is intended to:

1. Improve the energy efficiency of new buildings by approximately 25% (compared with those that met the previous 2006 regulations).

2. Improve the correlation between the predicted (TER) and actual (DER) performance of new buildings.

3. Continue along the path towards zero carbon new buildings within the next decade.

4. To promote improvement of the existing building stock.

9

Guidance appears in four new editions of the Part L Approved Documents, which came into force on 1 October 2010:

• Approved Document L1A - New Dwellings• Approved Document L1B - Existing Dwellings• Approved Document L2A – New Buildings Other Than Dwellings• Approved Document L2B – Existing Buildings

Other Than Dwellings

These are supplemented by two ‘second tier’ documents:

• The Domestic Building Services Compliance Guide• The Non-Domestic Building Services Compliance Guide

These are supported by ‘third tier’ documents, including standards, codes of practice, good practice guides and reports published by BRE, etc.

Explanation of SAP 2009– the ‘whole house approach’There is a continuing requirement for a whole building approach to be taken. This provides builders with a multitude of potential options and solutions in meeting the requirement including:

• Improving the U-values of the building fabric (walls, floors and roofs)

• Installing renewable energy sources• Increasing airtightness and reducing air permeability• Installing high efficiency boilers, heating controls and high

performance glazing

10

1 U-value requirements apply where original values are worse than threshold value and payback on work should not exceed 15 years

New Build Replacements to Existing

Retained thermal envelope (upgrading solid walls)

2006 2010 2006 2010 Threshold1 2010

Roof 0.25 0.20 0.16-0.20 0.16-0.18 0.35 0.16-0.18

Wall 0.35 0.30 0.30 0.28 0.70 0.30 solid wall 0.55 cavity

Floor 0.25 0.25 0.22 0.22 0.70 0.25

Demonstrating ComplianceThere are 5 criteria to demonstrate compliance:

1. Building Control to be provided with the TER & DER

Design stage calculationAs it stands only “as built” building regulations submissions are required to be made to the Local Authority Building Control Officer, although design submissions are recommended. A design stage calculation will be required by Part L1A as part of the plans submitted before construction. The builder will have to carry out a preliminary calculation before construction starts and this will be provided to Building Control, along with the specifications that deliver the claimed performance. SAP software will provide a list of design features that are critical to achieving compliance which along with the specification, will aid Building Control with compliance checking.

Specification checklist to support compliance checks by building control officersA summary of the specification (a) assumed at the Design Stage and (b) applied at the “as built” stage will need to be produced so that the building control officer can easily see any changes made alongside the DER/TER comparison. This will probably be produced by the SAP software used at both stages.

2. The design limits (longstop U-values) shown below must not be exceeded

11

3. Dwellings must not be at risk of overheating in the summer

This is demonstrated by a check included in the SAP energy rating calculation which grades the risk of summer overheating by means of a calculated ‘threshold temperature’ (i.e. the 24-hour mean internal temperature in warm weather). Designs with threshold temperatures above 23.5oC have a high risk of overheating and are deemed not to comply. The threshold temperature calculation ignores any installed comfort cooling or air conditioning, in order to promote designs that do not require such systems.

Design features that can be used to reduce the threshold temperature include: the area, orientation and shading of glazed openings; the thermal capacity of the building fabric; and the provision of secure ventilation (especially at night).

4. Construction details for all thermal bridges need to be evidenced and air permeability established to show this has not exceeded 10m3/m2h

The dwelling as constructed should include no significant thermal bridges, and the “as built” DER, including the tested air permeability, must not exceed the TER. To minimise thermal bridging, quality-assured accredited construction details should be used (see page 39). Industry-based accreditation schemes are to be set up, and will include site inspection to ensure construction quality and to provide feedback to the design and accreditation processes. Alternatively, if the construction details are not accredited, their linear thermal transmittances (Ψ values) may be calculated by persons with suitable expertise and experience, but the calculated values must be increased by 0.02W/mK or 25% (whichever is the greater) when used in DER calculations. If non-accredited details are used and Ψ values are not calculated, a conservative default overall thermal bridging transmittance (Y value) of 0.15 W/m2K must be included in the DER calculation. Three dwellings of each type must be pressure tested to confirm compliance with the design limit and to establish the tested air permeability for incorporation in the “as-built” DER calculation.

12

Tests must be carried out in accordance with the Air Tightness Testing and Measurement Association’s Technical Standard L1 Measuring air permeability in the envelopes of dwellings (2010). If the tested air permeability exceeds the design limit of 10m3/m2h @ 50 Pa, or results in the “as-built” DER exceeding the TER, then remedial measures must be implemented in all dwellings of that type, the dwelling must be re-tested to confirm compliance, and an additional dwelling of the same type must be tested. For dwellings that are not included in the test sample, the air permeability used in the “as-built” DER calculation is the test result plus 2m3/m2h. For developments of not more than two dwellings, the Building Control Body may accept a pressure test certificate for a dwelling of the same type, constructed within the previous twelve months. Alternatively, if no pressure testing is carried out, an air permeability of 15m3/m2h may be used in the calculation of the “as-built” DER (which still may not exceed the TER). Building services must be commissioned by suitably qualified persons, and commissioning certificates provided.

5. Home owners to be provided with information to use their homes efficiently: manuals and operating instructions for the building services & Energy Performance Certificates for white goods.

13

Reducing Energy Demand

The following ways of reducing the energy demand are interdependent and so need to be considered together when working out the rate that carbon dioxide will be emitted.

1. Reducing the demand for heating by cutting heat loss through the fabric by means of insulation and good detailing at junctions in the dwelling’s fabric, use of suitable windows and doors and minimising air leakage; and reducing the demand for cooling by insulating pipes and cylinders, and giving the building suitable orientation and shading;

2. Providing energy efficient means to supply and control heat, hot water, ventilation, cooling and lighting;

3. Ensuring that these are properly commissioned and that instructions are given so that they can be operated efficiently.

Party Wall requirements

SAP 2005 assumes that heat loss through party walls is zero; recent research by Leeds Metropolitan University has demonstrated that air movement within the cavity leads to a substantial amount of heat loss, equivalent to, or greater than, a similar area of external wall. In SAP 2009, the U-value of a cavity party wall will be set to between zero and 0.50W/m2K, depending upon the specification.

The notional dwelling includes a U-value for cavity party walls of zero. Therefore, the heat loss caused by the party wall bypass has to be addressed before the 25% CO2 emissions reduction is dealt with. One solution to this problem is to fully fill the party wall cavity (with Supafil) in conjunction with effective edge sealing e.g. adding a cavity stop sock at the junction of the party wall cavity with the external wall cavity and at the roof to party wall junction. The maximum fall back U-value for a party wall is 0.20W/m2K which equates to effective edge sealing only. If a U-value for the party wall of 0.20W/m2K is adopted rather than a zero U-value option it is approximately equivalent to adding 0.10W/m2K to the external wall U-value in a semi-detached house and 0.25W/m2K in a terraced house.

14

Air Permeability

The volume of pressure testing required will approximately double due to the requirements of the Part L1A and a confidence factor will apply to dwellings that have not been tested. The new requirement means that when a representative pressure test value is applied to a new dwelling, 2m3/h.m2 must be added to the measured value.

For example, if a builder seeks to use an air permeability of 7m3/h.m2 in his Dwelling Emission Rate (DER) and wishes only to test the minimum number allowed these tests values must be 5m3/h.m2 to allow him to continue to use 7m3/h.m2 in his calculations for the untested dwellings. This will probably lead to builders pressure testing all of their new dwellings.

Thermal Bridging

There are two types of thermal bridges which occur within buildings; repeating thermal bridges and non-repeating thermal bridges. Repeating thermal bridges are taken into account when calculating the U-value of a construction i.e. timber rafters and studs etc. Non-repeating thermal bridges are dealt with differently and these occur at junctions between building elements and around windows and doors and are known as psi values. A Y value is a correction to the fabric U-values of the dwelling and is arrived at by dividing the total area of the building fabric by the sum of the heat losses from the psi values.

Previously it was acceptable to simply specify a whole house Y value of 0.08W/m2K for the dwelling on the assumption that accredited construction details have been used.

This option is no longer available to comply with Part L1A as the actual design heat loss will need to be calculated by measuring the length of each junction type and multiplying it by the calculated psi value for that detail, repeating that for all the junctions and then adding all the heat losses.

15

A set of default psi values are provided in SAP 2009 documentation (Table K1 in Appendix K of the 2009 edition of SAP – www.bre.co.uk/sap2009) or in the relevant accredited construction details documents or calculated for specific junctions. All psi value calculations must be carried out by a competent person, and competency must be proven e.g. membership of an approved competency scheme.

The design detail to which the psi value applies is only one aspect of compliance as the detail must be buildable in the first place and so a further check is applied to details that are not part of accredited construction details and an assessment is made of the buildability of the detail concerned.

If the buildability assessment is included in a scheme that also has a site registration and inspection process then the psi value is taken at face value. If the detail is not part of an accredited assessment scheme then a safety factor of 0.02W/mK is added the psi value or it is increased by 25%, whichever is the greater.

Implementation date and related timescaleAlthough the effective date is October 2010 builders are permitted to continue to build to current regulations if:

• They have started building before 1st October 2010, or Building Notice, Plans Certificate or Full Plans have been

submitted before 1st October 2010 and work begins before 1st October 2011

17

18 Compliance Solutions through improvements to the Building Fabric Manufacturer Guidance – typical targets

19-23 Walls Masonry: Cavity & Solid Party Wall

24-27 Floors Beam & Block

28-30 Roofs Cold Warm

31 Lighting

Section 2

17

18

Compliance Solutions through improvements to the Building FabricManufacturer Guidance – typical targets

Due to the requirement for a whole building approach to be taken there are differing opinions on what U-values should be targeted for a building’s fabric. There is no right or wrong answer providing that all the options chosen achieve the target emissions rate.

New Build Existing Properties

2006 2010 2006 2010

RoofColdWarm

0.13-0.140.18-0.20

0.13 Celotex0.10 Knauf

0.10-0.14 Xtratherm

0.14-0.160.20

0.16 Celotex0.18 Celotex

0.16 Xtratherm0.18 Xtratherm

Wall 0.27 0.20 Celotex0.21 Knauf

0.10-0.20 Xtratherm

0.30-0.35 0.28 Celotex0.28-0.30 Xtratherm

Floor 0.20-0.22 0.15 Celotex 0.14-0.15 Knauf

0.10-0.14 Xtratherm

0.22-0.25 0.22 Celotex0.22-0.25 Xtratherm

Party Walls n/a 0-0.20 n/a n/a

Windows & External

Doors

2.2 1.4-1.5 2.2 2.0

19

The following provide guidance on achieving set U-valve in the wall, floor and roof through a variety of methods.

Walls

Masonry: Cavity & Solid

Partial Fill – PIR U-value of 0.25 W/m2k

50mm Residual Cavity

Wall Tie with Rotating Disc

50mm PIR Insulation Board

Aerated Block – Inner Leaf

12.5mm StandardPlasterboard

Brick Outer Leaf

20


Partial Fill – Phenolic U-value of 0.18 W/m2k

Full Fill – Glasswool & Thermal Laminate U-value of 0.20 W/m2k

Brick Outer Leaf



75mm Phenolic InsulationBoard

25mm PIR Bondedto 12.5mm StandardPlasterboard

Wall Tie

100mm Dritherm 37


Brick Outer Leaf



21


Full Fill – Glasswool U-value of 0.20 W/m2k

Full Fill – EPS U-value of 0.24 W/m2k

Brick Outer Leaf

Brick Outer Leaf

Wall Tie

100mm Jabfill Premium



Wall Tie

125mm Dritherm 32



22


Partial Fill – PIR U-value of 0.20 W/m2k

Full Fill – Glasswool U-value of 0.24 W/m2k

Brick Outer Leaf






Brick Outer Leaf

Wall Tie

100mm Dritherm 32



23

Party Wall

Full Fill – Glasswool U-value of Zero

Meet the demandswith theTravis Perkins Group

Available from Travis Perkins, Keyline & CCF

Aerated Block

Wall Tie

Aerated Block


100mm Dritherm 32with effective edge seal

24

Floors

Beam & Block Floors: Beam & Block

PIR Solution U-value of 0.13 W/m2kp/a ratio of 0.54

Glasswool Solution U-value of 0.16 W/m2kp/a ratio of 0.54

Sand / Cement or Self Levelling Screed


Vapour Control Layer


200mm Earthwool Thermal Floor Slab Plus

140mm PIR Insulation

DPM

DPM

Solid Dense Aggregate Block


Vented Void

Vented Void

Concrete Support Beam


25

Floors: Beam & Block

XPS Solution U-value of 0.15 W/m2kp/a ratio of 0.54

EPS Solution U-value of 0.15 W/m2kp/a ratio of 0.54





160 EPS (Jablite Premium)

150mm XPS (Polyfoam)

DPM

DPM



Vented Void

Vented Void



26

PIR Solution U-value of 0.17 W/m2kp/a ratio of 0.54

Glasswool Solution U-value of 0.19 W/m2kp/a ratio of 0.54





Vapour Control Layer170mm Earthwool Thermal Floor Slab Plus


DPM

DPM



Vented Void

Vented Void



27

EPS Solution U-value of 0.15 W/m2k p/a ratio of 0.4




140mm EPS (Jablite Premium)

DPM


Vented Void


28

Roofs

Glasswool SolutionU-value of 0.11 W/m2k)

Glasswool Solution U-value of 0.15 W/m2k200mm Rafter at 600mm Centres

Cold

Warm

Vented RoofVoid

12.5mm Standard Plasterboard

Breathable Membrane

25mm Drape Space

175mm Rafter Roll Insulation

40mm PIR Thermal Laminate

TimberBatten

Roof Tiles

300mm Loft Roll44 on top ofRafters

100mm Loft Roll44 betweenJoists

29

PIR Solution U-value of 0.16 W/m2k200mm Rafter at 600mm Centres

PIR Solution U-value of 0.15 W/m2k200mm Rafter at 600mm Centres

Roofs: Warm

Breathable Membrane

Breathable Membrane

25mm Drape Space

25mm Drape Space




37.5mm PIR Laminate(25mm PIR with 12.5mm Standard Plasterboard)

TimberBatten

TimberBatten

Roof Tiles

Roof Tiles

30

PIR & Multi Foil Solution U-value of 0.16 W/m2k200mm Rafter at 600mm Centres

Roofs: Warm

Breathable Membrane

TimberBatten

Roof Tiles

Drape Space

90mm PIR Insulation

15mm Air Space

TLX Silver

38mm Timber Battens


31

Lighting Low energy lighting100% counts towards meeting TER.

A minimum of 75% of light fittings must be low energy. If remaining light fittings are also low energy, the full 100% will contribute towards meeting the TER target. Light fittings can be either dedicated such that they will only take low energy lamps or they can be standard fittings which are supplied with a low energy lamp. Tungsten filament lamps or tungsten halogen lamps will not comply with ADL1A.

33

34 Compliance Advise using Renewable Technologies

34-35 Brief Explanation of Products

Section 3

33

34

Compliance Advise using Renewable TechnologiesThe thermal performance of a building’s fabric does not have to be constructed to such a high standard if it is designed to use renewable technologies.

Renewable technologies offer various solutions to help meet the new code requirements.

Each project will need to be designed and approved to meet the new codes.

Brief Explanation of ProductsGas Saver This is fitted to a boiler to increase its efficiency through recycling the waste heat generated.

Solar Water Heating Provides hot water by capturing solar energy through solar flat plate panels or evacuated tubes, usually located on the roof, and uses it to heat the water in a cylinder. This system is usually used in tandem with a high efficiency boiler.

PhotovoltaicsSolar PV, as it is commonly known, works by utilising the sun to generate free electricity. It relies on daylight (rather than radiation) to generate power through the use of photovoltaic cells within roof-mounted collectors (modules).

The electricity produced by Solar PV can be used to drive any appliance that is powered by electricity. An inverter converts the DC current into usable AC current that can then be used as power.

35

Air Source Heat Pump – Air to Water Creating heating and sometimes hot water by taking heat from the outside air and transferring it to the heating system via a heat pump, using the principle of vapour compression (or the refrigeration cycle).

Air Source Heat Pump – Air to AirHeats up Air by drawing outside air into the unit, heating it up and is then circulated via a fan unit into the property (the reverse of air conditioning).

Ground Source Heat Pump Draws energy from the ground, via a bore hole or ground loop, and coverts it via the heat pump into useful energy that can provide your heating and hot water. Mechanical Ventilation Heat Recovery Systems A fan based system that uses warm air from kitchens and bathrooms to heat fresh outside air that is drawn into the home. Then the warm air is fed into other rooms in the house via air ducts. This solution usually needs to be designed into the house before it is built.

Biomass This term is used for a heating and hot water system which creates energy by burning wood pellets, wood chips, waste or bio-oil.

Fuel Cells Fuel cells work by taking energy from fuel at a chemical level rather than burning it. The technology is still at developmental stage.

Meet the demandswith theTravis Perkins Group

Available from Travis Perkins & CPS

37

38 Other Key Products to Consider

39 Accredited Details

40 Historic Buildings

40 Extensions

41 Conservatories

42-43 Cavity Wall Areas requiring insulation to be Partially Filled only by NHBC

44 Insulation Material Thermal Performance Table

44 Building Block Thermal Performance Table

Section 4

37

38

Other Key Products to Consider

• Loft Hatches – a significant amount of heat loss is known to be caused by poorly insulated loft hatches.

• Draft Excluders, door brushes, threshold sealing bars, door surrounds.

• Letter Plates and escutcheons.

• Vapour Control Layers – thermal performances can be increased by c. 0.7 m2K/W with a reflective VCL if installed with a minimum 25mm air gap.

• External Wall Insulation Systems (EWI)

• Internal Wall Insulation Systems (IWI)

• Cavity Closers – improved air tightness and thermal bridging around windows and doorways.

• Manthorpe Radiator Pipe Seal and Guide

• Xtratherm Cavity Therm – full fill PIR solution in the wall achieving possible U-Value of 0.16 W/m2K

• Sheep’s Wool/Hemp Insulation – sustainable insulation for use in the roof or wall.

• Pipe Lagging and Tank/Cylinder Jackets

39

Accredited DetailsRobust Details Ltd and the British Board of Agrèment are setting up an assessment, inspection and registration scheme for thermal bridging details that will allow the full benefit of a calculated psi value to be included without any safety factor. It is likely that designed details can show an improvement over the standard accredited construction details. If the builder doesn’t want to bother with calculating psi values he can simply use a whole house Y value which is equivalent to adding 0.15W/m2K to all his building fabric, glazing and door U-values, as can be seen the importance of good detailing becomes ever more important. The following examples are accredited details for common construction methods.

Image Source: www.planningportal.gov.uk

40

Historic BuildingsListed buildings, buildings in Conservation Areas and Scheduled Monuments are ‘exempt’, but only to the extent that compliance would unacceptably alter their character or appearance. Other buildings of architectural or historic interest, including those in National Parks, Areas of Outstanding Natural Beauty and World Heritage Sites, are subject to ‘special considerations’, and energy efficiency should be improved as far as possible without prejudicing the buildings’ character or increasing the risk of deterioration.

Local historic buildings officers should be consulted about proposals, and guidance has been published by English Heritage.

ExtensionsThere are three ways in which the compliance of an extension may be demonstrated. Under the reference method all the elements of the design must meet the guidance for the provision of new thermal elements, controlled fittings and controlled services. The area of glazed openings in an extension must not exceed 25% of the floor area, plus the area of any openings in the original dwelling that are covered by the extension. Under the area-weighted U value method the thermal properties of exposed walls, roofs and floors, and the thermal properties and areas of glazed openings, may be traded-off against each other, provided that the area weighted average U value of the whole extension envelope is no greater than it would be if the extension complied by the reference method.

Under the whole dwelling calculation method SAP assessments may be used to show that the predicted carbon dioxide emissions of The Building Regulations, Part L (2010) 05 extended dwelling as proposed are no greater than they would be if the extension complied by the reference method. Improvements to the original dwelling may be traded-off against a lesser standard of performance in the extension, but they must meet the standards for thermal elements, controlled fittings and controlled services, as appropriate.

41

ConservatoriesA conservatory is exempt if: it is at ground level; it has floor area less than 30m2; it is separated from the dwelling by the original external walls, windows and doors (or, if they are replaced, by new ones that meet the standards for replacement thermal elements andcontrolled fittings); and the dwelling’s heating system is not extended into the conservatory. Conservatories that do not meet all of these conditions are treated as extensions, except that the maximum area of glazed openings does not apply. In addition the conservatory must be separated from the dwelling by the original external walls, windows and doors (or, if they are replaced, by new ones that meet the standards for replacement thermal elements and controlled fittings); and any fixed heating must have independent on/off and temperature control, and meet the guidance for controlled services. An attached structure that is not separated from the dwelling to which it is attached is treated as an extension, and the maximum area of glazed openings applies.

42

Cavity Wall Areas requiring insulation to be Partially Filled only by NHBCExternal masonry walls

Suitable wall constructions for use with full cavity insulation

Minimuminsulation thickness (mm)

Exposurecategory

Suitable wall construction Built-ininsulation

Retro-fill(other than UF foam)

UFfoam

VerySevere

Any wall with impervious cladding 50 50 50

Fairfaced masonry with impervious cladding to all walls above ground storey 100 100 N/A

Any wall fully rendered2 75 75 N/A

Fairfaced masonry1 N/A N/A N/A

Severe Any wall with impervious cladding or render2 50 50 50

Fairfaced masonry with impervious cladding or render2 to all walls above ground storey 50 75 50

Fairfaced masonry 75 75 N/A

Moderate Any wall with impervious cladding or render 50 50 50

Fairfaced masonry with impervious cladding or render to all walls above ground storey

50 50 50

Fairfaced masonry 50 75 75

Sheltered Any wall with impervious cladding or render 50 50 50

Fairfaced masonry with impervious cladding or render to all walls above ground storey

50 50 50

Fairfaced masonry 50 50 50

N/A – not applicable

43

Aberdeen

SHETLANDISLANDS

ORKNEYISLANDS

DundeePerth

Stirling

Glasgow Edinburgh

Ayr

Dunbar

CarlisleWorkington

Newcastle

Alston

Whitby

Middlesbrough

Darlington

Ripon

YorkHull

Grimsby

SkegnessLincoln

Nottingham

Doncaster

Sheffield

StaffordShrewsbury

Birmingham

Macclesfield

Manchester

Chester

SkelmersdaleColwyn Bay

Bangor

Bala

Hay-on-Wye

Leicester

Northampton

Peterborough Norwich

Cambridge

Colchester

Newbury

Aldershot GatwickSouthampton

Poole

Taunton

SidmouthExeter

Barnstable Watchet

Cardiff

Swansea

Brecon

Llandrindod Wells

Llanidloes

Exposure zones Exposure to wind drivenrain (litres/m2 per spell)

100 or more

56.5 to less than 100

33 to less than 56.5

less than 33

Very severe

Severe

Moderate

Sheltered

Bristol

Gloucester

Weston-Super-MareLondon

Staines

Dover

EastbourneBrighton

LutonWelwyn Garden City

Swindon

Inverness

Dornoch

Lerwick

Stranraer

Belfast

Londonderry

DungannonEnniskillen

Notes1. In Very Severe exposure locations fairfaced masonry with full cavity insulation is

not permitted.2. Render on an external leaf of clay bricks (F2,S1 or F1,S1 designation bricks to

BS EN 771) in Severe or Very Severe exposures is not permitted where the cavity is to be fully filled with insulation.

3. This table covers walls where the external leaf does not exceed 12m in height.4. The exposure category of the dwelling is determined by its location on the map

showing catergories of exposure to wind driven rain.

44

Insulation Material Thermal Performance Table

Building Block Thermal Performance Table

Type of Insulation Lambda Value W/mK

Kingspan Phenolic (note: slight lambda variation by thickness) 0.020 – 0.023

Xtratherm Safe-R Phenolic 0.22

PIR/PUR board (Celotex/Xtratherm) 0.021 – 0.023

Standard Extruded Polysytrene (Polyfoam) 0.029 – 0.035

Premium Grade Expanded Polystyrene (Jablite Premium) 0.030

Glasswool Cavity Batts (Knauf Insulation) 0.032 – 0.037

Standard Grade Expanded Polystyrene (Jabfloor 70) 0.038

Stonewool (Rocksilk Flexi/Rockwool Flexi) 0.035 – 0.038

Glasswool Loft Roll (Knauf Insulation) 0.040 – 0.044

Sheeps Wool/Hemp (Black Mountain Insulation) 0.039

Cavity Therm (Xtratherm) 0.021

Type of Building Block Lambda Value W/mK

Dense Aggregate Block 1.28

Hollow Aggregate Block 1.28

Lightweight Aggregate Block 0.45

Ultra Aggregate Block 0.32

Standard Aircrete 0.15

Solar Aircrete 0.11

Hi-Strength Aircrete 0.19

47

Glossary

47

48 Terms used in this Guide

53 Our Businesses

48

Terms used in this GuideLambda (Thermal Conductivity)

The rate at which heat is transmitted through a material, measured in watts per square metre of surface area for a temperature gradient of one Kelvin per metre thickness, simplified to W/mK. The Lower the value, the better the thermal efficiency of the material.

R-Value (Thermal Resistance)

It is measured in m2K/W and is equal to the thickness of the material (in metres) divided by the conductivity of that material. Surfaces and cavities also provide thermal resistance and there are standard figures for these resistances that must be taken into account when calculating U-values. The resistances of each material within an element are added together to determine the overall resistance of the element. The reciprocal of the overall resistance is the U-value. The higher the R-value, the more efficient the insulation.

Thermal Bridging

A thermal bridge is created when materials that are poor insulators come in contact, allowing heat to flow through the path created. Insulating around a bridge is of little help in preventing heat loss or gain due to thermal bridging; the bridging has to be eliminated, rebuilt with a reduced cross-section or with materials that have better insulating properties, or with an additional insulating component.

U-value (Thermal Transmittance – Component)

Commonly known as the U-value, it is a measure of the rate of heat loss of a building component. It is expressed as watts per square metre, per degree Kelvin, W/m2K. The U-value is calculated from the reciprocal of the combined thermal resistances of the materials in the element, air spaces and surfaces, also taken into account is the effect of thermal bridges, air gaps and fixings.

49

Y Value (Thermal Transmittance – Overall)

A Y Value is similar to a U-value in that it measures the rate of heat loss. However, whereas a U-value measures the loss of heat through a single building component, the Y Value measures the entire building overall.

SAP (Standard Assessment Procedure)

SAP is the Government’s ‘Standard Assessment Procedure’ for energy rating of dwellings. SAP, was designed to be included in the 1995 Building Regulations and it is now a compulsory component in Part L of the Regulations. Every new house has to have a SAP rating. ‘SAP’ can be defined as follows:

SAP provides a simple means of reliably estimating the energy efficiency performance of dwellings. SAP ratings are expressed on a scale of 1 to 100 – the higher the number the better the rating. Therefore SAP is similar to the fuel consumption of a car under standard driving conditions.

SAP is calculated by a procedure contained in the Building Regulations, which predicts heating, and hot water costs. These depend on the insulation and air tightness of the house and the efficiency and control of the heating system. The calculation uses the Building Research Establishment’s Domestic Energy Model (BREDEM).

The procedure for calculating SAP is defined by the published SAP worksheet - though in practice most people calculating SAP use one of the approved SAP calculation programs. These are computer programs, which are approved by the Building Research Establishment (BRE).

SAP programs are used to enter data on the size of the house, its insulation levels, its ventilation system and its heating and hot water systems. SAP ratings can then submitted for Building Regulations approval and checked by the local Building Control department.

50

BREDEM (BRE Domestic Energy Model)

BREDEM is a model for estimating the energy consumption in dwellings for space heating, water heating, lighting and electrical appliances, and cooking.

Code for Sustainable Homes

The Code is the national standard for the sustainable design and construction of new homes. The Code aims to reduce our carbon emissions and create homes that are more sustainable.The Code measures the sustainability of a new home against nine categories of sustainable design, rating the ‘whole home’ as a complete package. The Code uses a one to six star rating system to communicate the overall sustainability performance of a new home. The Code sets minimum standards for energy and water use at each level and within England, replaces the EcoHomes scheme, developed by the Building Research Establishment (BRE).

Radiation

The process by which heat is emitted from a body through open space, for example, sunlight.

Emissivity

Emissivity is a measure of the radiation emitted from a surface. ‘Black bodies’ (materials with matt black surfaces) have a high emissivity & emit large amounts of radiation. In contrast shiny surfaces, such as polished aluminium, have a low emissivity. This characteristic can be exploited in buildings by providing aluminium foil facings on insulation materials, facing out towards cavities to reduce the radiated heat loss. Matt black has a typical emissivity of 0.95, compared to 0.08 for polished aluminium. But most building surfaces, even white painted surfaces, have high emissivities, of around 0.90 to 0.95.

51

EPC (Energy Performance Certificate)

Energy Performance Certificates (EPC) have been introduced to help improve the energy efficiency of buildings.

When buying or selling a home you now need a certificate by law. From October 2008 EPCs are required whenever a building is built, sold or rented out. The certificate provides ‘A’ to ‘G’ ratings for the building, with ‘A’ being the most energy efficient and ‘G’ being the least, with the average up to now being ‘D’. An example is shown below:

52

Interstitial Condensation

Most building materials, except metals, plastics and certain lined elements, are to some extent permeable and do not obstruct the movement of moist air through the structure. The warm moist air will eventually cool below its dew point within the fabric of the building resulting in condensation. This form of condensation is Interstitial Condensation.

Interstitial Condensation is rather more complex than surface condensation and presents a greater hazard because the resulting high moisture content can often go undetected for long periods until serious structural damage has developed such as timber decay.

Surface Condensation

Condensation in a building usually occurs when warm air comes into contact with a cold surface. The air is cooled below its saturation point causing its excess water vapour to change into liquid water. The condensed water usually appears as water droplets or water film on non-absorbent surfaces such as windows or tiles. This form of condensation is surface condensation. It is obvious and always occurs on the surfaces which are at or below the dew point of the air immediately adjacent.

Brand Awareness

The Travis Perkins Group is a leading supplier to the UK Building and Construction industry, providing more than 120,000 product lines to the trade, including general building materials, timber, plumbing & heating, kitchens, bathrooms, landscaping materials and tool hire.

Born out of the merger in 1988 between Travis & Arnold and Sandell Perkins, the Group can trace its roots back for over 200 years.

53

Our Businesses

We’re proud of our businesses and our colleagues that work to support them. Below is a list of the businesses within the Travis Perkins Group. You can visit their websites and find out more about the brands that make up the Travis Perkins Group.

Travis Perkins is the only merchant you need. One of the largest suppliers to the UK’s building and construction industry with a nationwide network of more than 600 branches. Providing a huge range of over 100,000 product lines. From general building and decorating materials and tools to landscaping, kitchens, bathrooms, plus a core range of essentials that’s never out of stock.

www.travisperkins.co.uk

Keyline supplies the widest range of heavy building materials, civils and drainage solutions to the UK construction industry. With expert staff and a national network of branches, Keyline provide effective solutions and a responsive service to contractors and local tradesman.

www.keyline.co.uk

City Plumbing Supplies is a major nationwide plumbing and heating merchant serving both the contract market and the general plumbing and heating market. City Plumbing offer a wide range of plumbing, heating and bathroom products including boilers, cylinders, radiators, underfloor heating, renewable energy products, copper and fittings, plus an extensive range of sanitaryware, all from quality brands.

www.cityplumbing.co.uk

54

CCF is one of the UK’s leading distributors of interior building products to the construction industry. Offering a complete service to interiors specialists, contractors and builders specialising in ceilings, drywall, flooring, insulation, partitioning and fire protection. CCF’s extensive range can be supplied from stock and delivered nationwide without delay, with a service that can be trusted and reliable advice from knowledgeable staff, who understand the industry and put the customers needs first.

www.ccfltd.co.uk

Wickes stocks an extensive range of trade essentials. Everything from bathrooms, kitchens, doors, plasters and boards and more. We also stock product lines in plumbing, fires, lighting, timber, and tools.

www.wickes.co.uk

Benchmarx Kitchens and Joinery is a one-stop shop, supplying the trade at competitive prices with quality kitchens, doors, joinery, flooring, and everything else you need to complete the job, from the best known brands and world-class suppliers.

www.benchmarxjoinery.co.uk

Tile Giant can provide all the tiling materials and tools you require, with a giant range and savings to match. With an expanding network of over 80 stores nationwide, you can expect competitive prices, plus a knowledgeable and friendly service from staff who are committed to helping your business.

www.tilegiant.co.uk

55

City Heating Spares is the super-fast heating spares merchant trading at selected City Plumbing Supplies branches, with expert, knowledgeable staff to talk to and thousands of parts in stock you can pick up what you need today and if it the parts are not in stock, order by 5pm and collect after 8am the next day.

www.cityheatingspares.co.uk

BSS are specialist distributors of pipeline, heating and mechanical services equipment. Established over 110 years ago with a single location, BSS industrial has grown to 63 branches supported by a National Distribution Centre based at Lutterworth in the East Midlands which provides daily branch deliveries.

www.bssindustrial.co.uk

BPT is a leading wholesaler of power tools, hand tools and site equipment, carrying a distinguished line-up of global brands covering 20,000 products.

www.birchwoodpricetools.com

PTS is one of the UK’s leading suppliers of plumbing, heating and sanitaryware products, stocking over 30,000 products from over 500 suppliers, with a wide range of leading brands supplied to customers both in the public and private sector.

www.ptsplumbing.co.uk

Buck & Hickman are the UK’s leading distributor of Tools, Maintenance and Health & Safety products. We have been successfully trading for over 180 years and were the first major tools distributor in the UK.

www.buckandhickman.com

56

www.travisperkinsplc.com Registered Office: Lodge Way House, Lodge Way, Harlestone Road, Northampton, NN5 7UGRegistered in England 824821

The information contained in this publication is believed to be correct and complete at the time of printing. Due to limitations in the printing process images may not be representative of their true colours and colour variations may occur due to the natural origin of the products. Stock may vary from branch to branch and is subject to availability. All photographs are as a guide only and do not necessarily represent the products available. Travis Perkins plc reserves the right to change product details without prior notice. Errors & omissions excluded. All products sold subject to Travis Perkins Terms & Conditions of Sale. Travis Perkins plc is the owner of the registered trademark Travis Perkins. JB59728 01/11

To find your nearest branch please visit www.travisperkinsplc.co.uk and follow the links for the brand you are interested in, or text one of the brand names below and the town you are in (e.g. Travis Derby) to 81222*. Text ‘Travis’ ‘CPS’ ‘Keyline’ ‘CCF’ or ‘Bench’.*You will be charged at your standard network rate. You will not be charged for receiving texts from Travis Perkins plc.

Your local branch is

Meet the demands with theoup -...

Documents

Transcript of Meet the demands with theoup -...