Purpose made 'Rafter Tray' to ensure cross ventilation
Eaves ventilation: 10mm continuous gap
High level air brick to ---1.i ventilate new cavity
Minimum 50mm cavity ---
Low level air brick to ---M ventilate new cavity
Flo,hlog to b, � -in satisfactory I r : High level vent tile to
give equivalent 5mm gap - spacings fixed, and installed
condition "'-.
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1 I to manufacturers specification
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Tyvec (or equivalent) breathable membrane
75 x 50mm C16 timber studwork
Minimum 75mm Kingspan (or equivalent)
500 gauge Visqueen DPM (or equivalent)
12.5mm plasterboard and skim
100mm mineral wool insulation laid between joists 170mm mineral
wool insulation laid at right angles above joists
Minimum 22mm T&G floor boards - moisture resistant grade to
utility, bathroom, kitchen etc.
1200 gauge Visqueen DPM (or equivalent) on existing concrete
garage floor (if suitable) 100mm Kingspan
(or equivalent) 50 x 100mm C16 treated timber floor
External Ground
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Visqueen DPM lapped and taped up and around floor joists held in
place by studding sole plate
Detail:
New floor meets new stud
wall sole plate
pro Jee
Building
Control �' LABC
garage conversion detail
JB Jan 09wg no:
1 :20 1: 10 1 of 3
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Cavity construction: 102.5mm facing brickwork
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Walls properly bonded (crocodile or similar wall ties)
85mm fully filled cavity with Dritherm (or equivalent) 100mm
Thermalite (or equivalent) internal blockwork Stainless steel wall
ties at 900mm horizontal and 450mm vertical centres, maximum 300mm
at reveals
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Ground Floor Plan First Floor Plan
NB Slab thickness to be confirmed on site and deemed
satisfactory to build off by LABC Officer
NB The installation of insulation and ventilation to existing
flat roofs is difficult, compliance with the regulations may best
be achieved by constructing a warm roof. It is accepted that this
could cause flashing problems but is probably the only realistic
way of achieving compliance. On the plus side, properly constructed
warm roofs are far more durable than cold roofs.
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500 gauge Visqueen DPM (or equivalent) trapped between exiting
pier and and insulation board
Minimum 25mm Kingspan (or equivalent) to prevent cold bridging
on piers
12.5mm plasterboard to run flush
Detail:
Existing garage pier
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Synthaprufe (or equivalent) tanking system with 1200 gauge
Visqueen DPM (or equivalent) laid over the top extending minimum
half way into new cavity wall and
De ta i l : returned to stud cavity
New cavity construction in
existing garage door opening
NB If no direct external access in available off new extension
and where not already present. works wl'll require mains wired
smoke detection in all circulation areas, interlinked with battery
back-up, manufactured installed and commissioned in accordance with
Approved Document Band BS 5446: pt 1: 2000
proJec
garage conversion detail
JB Feb 09 wg no:
1 :50 1 :20 2 of 3
Building
Control �' LABC
