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GLIDEVALE LIMITED2 Brooklands Road, Sale, Cheshire M33 3SS Tel: 0161 905 5700 Fax: 0161 905 2085Email: info@glidevale.com Web: www.glidevale.com

Glidevale Limited maintains a policy of continuous development and reserves the right to amend product specifications without notice.

A division of Building Product Design Ltd. Company Registration No; 3944123

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. . . . . . . . . . . . . . . . . . . . . .910035 November 2015 4631

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LOFT ACCESS TRAPS

CI/SfB (47) Uniclass L529November 2015

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Stockist’s stamp

TECHNICAL REQUIREMENTS OTHER PRODUCTS

LA4 / LA8 Loft Ladders Designed to provide easy access to the loft space. For use with LA2 and LA6 Loft Access Traps. Robust, lightweight aluminium construction in two (LA4) orthree (LA8) telescoping sections, mounted on hinge bracketswhich are fixed to the ceiling joist or loft boarding, not to thetrap itself.LA4 Loft Ladder suitable for floor-to-floor heights of 2210 to2670mm. LA8 Loft Ladder suitable for floor-to-floor heights of2210 to 2910mm.Both LA4 and LA8 Loft Ladders supplied with a pole to enablethe ladder to be pulled down.

Glidevale Limited market a wide range of other building products including:

Glidevale roof ventilation products

Glidevale underfloor and wall vents

Glidevale Sunscoop tubular rooflights

Protect high performance roofing underlays and building membranes

Building RegulationsRequirements applicable to loft trapsare given in Approved Documents C(condensation control), L (thermalinsulation) and B (fire).

Condensation controlThermal insulation at ceiling levelproduces a cold roof with an increasedcondensation risk due to moisturevapour migrating into the loft spacefrom the dwelling below. Most of thewater vapour in the roof void comesfrom washing, drying and cookingwithin the house. It enters the void bydiffusion through the ceiling, and by airmovement through gaps around atraditional loft trap, pipes, ceiling rosesand cracks.

With a conventional unsealed lofthatch, approximately 50% of vapourtransfer by air movement occurs around the hatch cover (BRE Digest270). With a Glidevale sealed Loft Trapthis can be cut to almost zero.

Approved Document C requiresprovision to control condensation inroof voids. BS 5250 incorporatingAmendment 1 is now the main meansof compliance with these requirements.

BS 5250 Clause H.3.2 recognises thata totally airtight (convection tight)ceiling is extremely difficult to achievein practice, but provides advice on howto construct what has been termed a‘well-sealed ceiling’. It includes thefollowing specific requirements foraccess hatches:

‘...Loft access hatches and downlightersshould not be located in rooms with highrates of moisture generation such askitchens and bathrooms and shouldhave low air leakage rates .

The air leakage rate through an accesshatch, including its frame, when testedto BS EN 13141-1 is less than 1m3/h ata pressure difference of 2Pa.’

For more information on well-sealedceilings please refer to BREInformation Paper IP4/06 Airtightnessof ceilings (Energy loss andcondensation risk) and the GlidevaleWhite Paper ‘Well Sealed CeilingsExplained’.

NHBC Standards 7.2-S14 also requiresa draughtstripped loft hatch.

ISO 9001 OHSAS 18001

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The energy conservation and air leakagerequirements of Building Regulations

(Approved Documents L and C) mean that a lofttrap needs to be a high-performance product.Site-constructed traps are no longer adequate.

Glidevale Loft Access Traps have been designed and engineered under BS EN ISO 9001 to meet these latest demands.

PERFORMANCE

Data from testing is available on request.

Resistance to air leakageAll Glidevale Loft Access Traps incorporateefficient vapour seals which limit thetransfer of moisture-laden air into the roofspace. They comply with the air leakagerequirement of BS 5250 Clause H.3.2, andcan be used to meet the requirements ofApproved Document C, Robust Details2002, and the recommendations of BREDigest 270 and BRE IP4/06.

Thermal insulationU-values are shown in the Selector Table.Selected Insulation to meet the minimum U-value requirement of the ApprovedDocuments C, L1A and L1B.

Wind upliftThe tight fit of Glidevale Loft Traps holdsthem in place; weighting or latching is notneeded in normal conditions such as airmovement caused by doors opening andclosing in airtight houses.

Where exposure to gusts of wind throughexternal doors might cause uplift, the LA1trap includes an anti-wind upliftmechanism, or the LA2 hinge-down trapcan be specified.

FireSurface spread of flame ratingLA5 FR option provides Class 0 surfacespread of flame rating based on the doormaterial performance (Masterboard). LA6 provides a Class 0 surface spread offlame rating based on the door materialbeing of limited combustibility (Zintec),therefore is deemed to satisfy.

Fire resistanceLA5 FR option with Masterboard facingprovides 30 minutes fire resistance wheninstalled in appropriate construction.LA6 as standard provides 60 minutes fireresistance when installed in appropriateconstruction.Fire performance is demonstrated byindependent tests.

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0Pressure Difference (Pascals)

Volume Airflow (m

3 /h)

1.0

0.8

0.6

0.4

0.2

0.0

200

180

160

140

120

100

80

6050 –>

40

20

05 10 15 20

Volume Airflow (m3/h)

Volume Resistance (Pascals)

Airtightness performance ofLA2 Loft Access Trapcompared to the minimumperformance provision of BS 5250: 2011

LA2 Loft Trap Performance

Maximu

m Leakage

Rate u

nder BS

5250

Environmental assessmentAll Glidevale Loft Access Traps useinsulation which has a Global WarmingPotential (GWP) of less than 5 and anOzone Depletion Potential (ODP) of zero.

Specification clauseSelect from the followingparagraphs as appropriate:Loft access traps to be Glidevalecomplete Loft Access Trap andframe units obtainable fromGlidevale Limited, 2 Brooklands Road, Sale,Cheshire M33 3SS, Tel: 0161 905 5700, Fax: 0161 905 2085, Email: info@glidevale.com.LA1: push-up trap door ofinjection-moulded polypropylenewith insulation infill and PVCback, twin latch and anti-winduplift mechanism. Two lockablesecurity bolts*.LA2: hinge-down trap door ofinjection-moulded polypropylenewith insulation infill and PVCback, twin latch. Lockablesecurity bolt*.LA5: push-up trap door of 6mmstoved finish hardboard withinsulation infill and PVC back.LA5 FR: push-up trap doorhaving 30 minutes fire resistanceand Class 0 surface flamespread, of 6mm Masterboardwith spray-applied vinyl finish,insulation infill, PVC back,pressed metal support brackets,intumescent strip to frame.Frame for all the above: injection-moulded polypropylene withclosed-cell vapour seals.LA6: hinge-down trap door andframe with 60 minutes fireresistance, of 1.0 and 1.2mmZintec electro-galvanised mildsteel finished in polyester powdercoating, insulation infill, expandedpolyurethane draught strip,concealed lock. High-securitylock.*Accessories: Access pole forLA2 Loft Trap.LA4 aluminium Loft Ladder intwo telescoping sections / LA8aluminium Loft Ladder in threetelescoping sections* mountedon hinge brackets, with crankedaccess pole.Performance: (according tomodel)U-value: 0.35 / 0.66 / 0.67*W/m2K.Surface flame spread ratingClass 0 as defined by BuildingRegulations ApprovedDocument B Appendix A.Fire resistance: 30 / 60* minutesto BS 476-22.Installation: install in accordancewith manufacturer’s instructions.*Delete as applicable

LOFT ACCESS TRAPS

DESCRIPTION

Each Glidevale Loft Access Trapcomprises a frame which is fixed into atrimmed opening and has a seal to theceiling and a trap door which is thermallyinsulated and has a flexible closed cellseal between door and frame.

COMPOSITION

LA1 push-up trapThe trap door is injection-mouldedpolypropylene with insulation infill and ablack PVC back. Twin latches, and anti-wind uplift mechanism at the oppositeend of the door, prevent the trap frombecoming dislodged if there is severewind gusting.Option: Two lockable security bolts.

LA2 hinge-down trapThe trap door is injection-mouldedpolypropylene with insulation infill and ablack PVC back, attached to the frameby two hinges. Twin latches hold thedoor against the closed cell gaskets. Access pole supplied for opening.Option: One lockable security bolt.

LA5 push-up square trapThe standard trap is 6mm stoved finishhardboard with insulation and PVC back.

LA5 FR 30 minutes fire-ratedThe face of the trap is 6mmMasterboard with spray-applied vinylfinish and insulation infill. The trap haspressed metal support brackets and theframe is fitted with intumescent strips.

LA6 60 minutes fire-ratedDoor and frame are formed from 1.0mmand 1.2mm Zintec electro-galvanisedmild steel finished in polyester powdercoating with insulation infill. Closed cellgaskets. Concealed key-operated lock. Option: High security lock for communal areas.

FramesAll frames except for LA6 are injection-moulded polypropylene.

SizesAll models meet or exceed the NHBCminimum opening size (NHBC Standards7.2-D14), and suit 600mm joist centres. They can be used for other joist centres bycutting a joist and trimming the opening(subject to structural considerations).

AppearanceLA1 and LA2 trap and frame have a lightlytextured scuff-resistant white finish, whichblends unobtrusively with a classic brilliantwhite ceiling.

All frames have the same finish, and coverthe edges of the ceiling hole to give a neatappearance.

LA5 trap door is matt white.LA6 is polyester powder coated in white.

Maximum Leakage Rate under new Part L

(based on LA2 Loft Trap Area)

LA2 Loft Trap Performance

Airtightness performance of LA2 Loft Access Trapcompared to the minimumperformance provision ofApproved Documents L1Aand L1B

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GLIDEVALE LOFT ACCESS TRAP SELECTOR

Model Operation Accessible clearance Trimmed U-value Fire performance: Accessories:opening nominal (mm) opening size (mm) (W/m2K) flame fire resistance standard optional

spread integrity (mins)

LA1 Part L Push-up 680 x 520 717 x 555 0.35 1 - Twin latch, anti-wind Two lockable securityLA1 0.66 uplift mechanism bolts, access pole

LA2 Part L Hinge-down 600 x 520 717 x 555 0.35 1 - Twin latch, One security bolt,LA2 0.66 access pole Loft Ladder LA4 / LA8

LA5 Push-up 530 x 530 560 x 560 0.67 1 - - -

LA5 FR Part L2 Push-up 530 x 530 560 x 560 0.35 Class 03 302 - -

LA6 NS Part L Hinge-down 540 x 520 647 x 5475 0.35 Class 04 60 Concealed lock High-security lockLA6 Part L Hinge-down 600 x 520 708 x 5475 Loft Ladder LA4 / LA8

Notes1 Not normally required under Building Regulations Approved Document B.2 Option - must be specified.3 Surface flame spread class for the door material for Building Regulations.

● Each Glidevale Loft Access Trap is a complete unit comprising frame and trap door, with integral closed-cell air/vapour seals and thermal insulation.

● The integral seals significantly reduce water vapour migration into the loft space, reducing condensation risk.

● The seals also virtually eliminate heat loss by air movement around the trap door and exceed the airtightness requirementof the Approved Documents, as demonstrated by test.

● The traps provide continuity of thermal insulation at ceiling level, substantially reducing heat loss by conduction through the trap.

● Options with enhanced insulation meet the minimum U-valuerequirement of the Approved Documents.

● Optional key-operated security bolts for tenanted properties or public areas.

● Half-hour fire resistance option with Class 0 flame spread on LA5 model.

● One hour fire resistance on LA6 model.

● Suitable for standard 600mm joist centres.

BENEFITS

4 Surface flame spread class based on deemed-to-satisfy rules for Building Regulations.5 The trimmed opening in the joists should be lined with 6mm fire-resisting board such as Supalux, therefore the finished opening size for the LA6 NS will be 635 x 535mm and for the LA6 will be 696 x 535mm.