Dormer in section 3 11.
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That would be impossible since a flat roof would receive so much weight from water buildup and snow buildup that it would not be long lasting.
If you want a diy flat roof here are the steps to follow.
If you didn t get it right you concentrated the stresses at roof edges and you could suck in a parapet or tear or rip a membrane at the parapet photographs 3 and 4.
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Ventilated batten void warm roof gable 3 06 timber frame timber flat roof 3 07 timber frame timber flat roof with parapet 3 08 timber frame lintel at window head 3 09 timber frame windows and doors jambs and cills specification within an example should 3 10 timber frame ground.
Flat roof joist and decking 3 10.
There have been numerous cases of rotting timber in new zealand parapet walls.
This air is vented at either end of the roof to allow a continuous air flow.
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In terms of rules on ventilation bs 5250.
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Courtesy of max baker and the national research council of canada.
Parapet detail joists parallel details in section 4.
Dormer in perspective view 3 12.
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2011 control of condensation in buildings is the document to view.
Parapet detail joists perpendicular 3 13.
One important and perhaps not so obvious fact is that a flat roof is not actually flat.
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Roof panels 3 8 1 roof panel connections 3 9.
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Put simply a warm flat roof has insulation of some kind packed into every available void and a cold flat roof allows air to circulate between the joists.
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