Glidevale Loft Access Hatches

1 LOFT Access HATCHESNEW RANGECI/SfB (47) Uniclass Pr 30_59_36 September energy conservation and air leakage requirements of Building Regulations (Approved Documents L and C) mean that a loft hatch needs to be a high-performance product. Site-constructed Hatches are no longer loft Access Hatches have been designed and engineered under BS EN ISO 9001 to meet these latest Access HATCHESDESCRIPTIONEach Glidevale loft Access hatch comprises a frame which is fixed into atrimmed opening and has a seal to the ceiling, and a hatch door which is thermallyinsulated and has a flexible closed cell sealbetween door and push-up hatchThe hatch door is injection-mouldedpolypropylene with insulation infill. Twinlatches, and an anti-wind uplift mechanismat the opposite end of the door, prevent thehatch from becoming dislodged if there issevere wind :Two lockable security hinge-down hatchThe hatch door is injection-mouldedpolypropylene with insulation infill, attachedto the frame by two hinges.

2 Twin latcheshold the door against the closed cell gaskets. Option:One lockable security bolt or key 1 hour fire-rated (FR) hinge-downhatchThe door and frame are formed and Zintec electro-galvanised mild steel finished in polyesterpowder coating with insulation infill. Closedcell gaskets. Concealed key-operated lock. Option:High-security lock for communalareas. AH7 1/2 hour fire-rated (FR) push-uphatchThe face of the hatch is 6mm Masterboardwith spray-applied vinyl finish and insulation infill. The hatch has pressedmetal support brackets and the frame is fitted with intumescent frames except for the AH6 are injection-moulded All models meet or exceed the NHBC minimum opening size (NHBC Standards ).

3 Each Glidevale loft Access hatch is a complete unit comprising frame and 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 hatch door and exceed the airtightness requirement of the Approved Documents, as demonstrated by test. The Hatches provide continuity of thermal insulation at ceiling level, substantially reducing heat loss by conduction through the hatch. Options with enhanced insulation meet the minimum U-value requirement of the Approved Documents.

4 Optional key-operated security for tenanted properties or public areas. 1 hour and 1/2 hour fire resistance options with Class 0 surface flame spread available. Suitable for standard 600mm joist push-up hatchAH5 Part L loft hatchLatch from testing is available on to air leakageAll Glidevale loft Access Hatches incorporate efficient vapour seals whichlimit the transfer of moisture-laden air intothe roof space. They comply with the airleakage requirement of BS 5250 , and can be used to meet the requirements of Approved Document C,Robust Details 2002, and the recommendations of BRE Digest 270 andBRE IP4 insulationU-values are shown in the selector table. Insulation options are available to meet theminimum U-value requirement of the Approved Documents C, L1A and upliftThe tight fit of Glidevale loft Hatches holdsthem in place; weighting or latching is notneeded in normal conditions such as airmovement caused by doors opening andclosing in airtight exposure to gusts of wind throughexternal doors might cause uplift, the AH4hatch includes an anti-wind uplift mechanism, or the AH5 hinge-down hatchcan be spread of flame ratingThe AH6 provides a Class 0 surface spreadof flame rating based on the door materialbeing of limited combustibility (Zintec),therefore is deemed to satisfy.

5 The AH7 FR option provides a Class 0 surface spread of flame rating based on thedoor material performance (Masterboard).. Glidevale LOFT Access HATCH SELECTORM odelOperation Accessible Trimmed U-value Fire performance:Accessories:Accessories:clea rance opening (W/m2K) surface fire standardoptionalopeningsize (mm)flameresistancenominal spreadintegrity (mm)(mins)AH4 Part LPush-up680 x 520717 x 555 latch, anti-windTwo mechanismsecurity bolts, Access poleAH5 Part LHinge-down 600 x 520717 x 555 latchOne lockable bolt, key lock, loft ladder, Access poleAH6 1hr FR Part LHinge-down 540 x 520647 x 0360 Concealed lockHigh-security keylockAH7 1/2 hr FR Part LPush-up530 x 530560 x 560 0230--Notes1 Not normally required under Building Regulations Approved Document flame spread class for the door material for Building flame spread class based on deemed-to-satisfy rules for Building trimmed opening in the joists should be lined with 6mm fire-resisting board such as Supalux.

6 Therefore the finished trimmed opening size for the AH6 will be 635 x resistanceThe AH6 as standard provides 1 hour fireresistance when installed in hinge-down hatchAH6 1 hour fire-ratedhinge-down hatchThe AH7 FR option with Masterboard facing provides 1/2 fire resistance when installed in appropriate performance is demonstrated by independent models meet or exceed the NHBC minimum opening size (NHBC ), and suit 600mm joist centres. They can be used for other joist centresby cutting a joist and trimming the opening (subject to structural considerations).. Pressure difference (Pascals)Volume airflow (m3/h) performance ofAH5 loft Access hatch compared to the minimumperformance provision of BS 5250: 2011AH5 loft Access hatch performanceMaximum leakage rate under BS 5250 Specification clauseSelect from the following paragraphs as appropriate:Loft Access Hatches to be Glidevale complete loft accesshatch and frame units obtainablefrom Glidevale , 2 BrooklandsRoad, Sale, Cheshire M33 3SS, Tel: 0161 905 5700, Fax: 0161 905 2085, Email: push-up hatch door of injection-moulded polypropylenewith insulation infill, twin latchand anti-wind uplift lockable security bolts*.

7 AH5: hinge-down hatch door of injection-moulded polypropylenewith insulation infill, twin security bolt*. Key lock*.AH7 FR Part L: push-up hatchdoor having 1/2 hour fire resistance and Class 0 surfaceflame spread, of 6mm Masterboard with spray-appliedvinyl finish, insulation infill, PVCback, pressed metal supportbrackets, intumescent strip for all the above: injection-moulded polypropylenewith closed-cell vapour : hinge-down hatch doorand frame with 1 hour fire resistance and Class 0 surfaceflame spread, of and electro-galvanised mildsteel finished in polyester powder coating, insulation infill,expanded polyurethane draughtstrip, concealed lock. High-security lock.*Accessories: AHP Access polefor AH4 / AH5* loft aluminium loft ladder in twotelescoping sections mountedon hinge brackets, with crankedaccess pole for AH5 loft : (according tomodel) U-value: / * flame spread ratingClass 0 as defined by BuildingRegulations Approved Document B Appendix resistance: 30 / 60* minutesto BS : install in accordancewith manufacturer s instructions.

8 *Delete as >40200 5 10 15 20 Volume airflow (m3/h)Volume resistance (Pascals)Maximum leakage rate under new Part L(based on AH5 loft Access hatch area)AH5 loft Access hatch performanceAirtightness performance of AH5 loft Access hatch compared to the minimumperformance provision ofApproved Documents L1 Aand L1 BAH7 1/2 hour fire-rated push-up hatchAppearanceBoth the AH4 and AH5 Hatches and frameshave a lightly textured scuff-resistant whitefinish, which blends unobtrusively with aclassic brilliant white frames have the same finish, and coverthe edges of the ceiling hole to give a AH6 is polyester powder coated inwhite. The AH7 hatch door is matt assessmentAll Glidevale loft Access Hatches use insulation which has a Global Warming Potential (GWP) of less than 5 and anOzone Depletion Potential (ODP) of REQUIREMENTSB uilding RegulationsRequirements applicable to loft accesshatches are given in Approved Documents C (condensation control), L (thermal insulation) and B (fire).

9 Condensation controlThermal insulation at ceiling level produces 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 a traditional loft hatch, pipes, ceilingroses and a conventional unsealed lofthatch, approximately 50% of vapourtransfer by air movement occurs around the hatch cover (BRE Digest270). With a Glidevale sealed loft hatchthis can be cut to almost Document C requires provision to control condensation inroof voids. BS 5250 incorporating Amendment 1 is now the main meansof compliance with these 5250 Clause recognises thata totally airtight (convection tight) ceiling is extremely difficult to achievein practice, but provides advice onhow to construct what has beentermed a well-sealed ceiling.

10 It includes the following specific requirements for Access 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 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 BRE Information Paper IP4/06 Airtightnessof ceilings (energy loss and condensation risk).NHBC Standards also requires a draughtstripped loft Brooklands Road, Sale, Cheshire M33 3SS Tel: 0161 905 5700 Fax: 0161 905 2085 Email: Web: maintains a policy of continuous development and reserves the right to amend product specifications without division of Building Product Design Ltd.