PHT47 – Passivhaus Twin Stud Timber Frame Flat Roof Eaves

Price range: £9.00 through £14.00 + VAT

This detail presents the eaves junction between a Passivhaus twin stud timber frame external wall and a flat roof. The external wall shows 300mm cellulose insulation between twin studs, and the roof shows 360mm of rigid mineral wool insulation in two layers.

The flat roof construction includes single ply waterproof membrane, vapour control layer forming the airtight layer, 18mm plywood decking, firrings to form falls (minimum 1:40 to achieve finished fall of 1:80), Posi-Joist rafters to structural engineer’s details, and plasterboard with plaster skim finish.

The detail includes insulated upstand with waterproof membrane lapped up minimum 150mm, powder coated aluminium coping with breather membrane and roof waterproofing lapped under, and high level ventilation gap with insect mesh. Airtightness continuity is achieved by sealing the VCL at floor level to the wall below, then wrapping around the roof structure and sealing to the wall above.

See drawing notes for full information.

Features of this detail: Passivhaus, twin stud timber frame, flat roof, eaves junction, Posi-Joist rafters, cellulose insulation, rigid mineral wool insulation, single ply membrane, vapour control layer, airtightness layer, insulated upstand, aluminium coping, cavity barrier, perimeter insulation, low U-value

 

£9.00 + VAT
£14.00 + VAT
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03_01 Passivhaus Twin Stud LR

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