Venting A Cold Flat Roof

Air flow between vents will also be affected by the resistance to lateral flow.

Venting a cold flat roof.

A cold roof really is colder than the rest of your home in the winter which means condensation is much less likely to develop. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below. How do i add ventilation on this side to create through air movement. On most flat roofs however stack effect will be ruled out since all vent openings will be at approximately the same level and there will generally be only small pressure differences from wind.

That means the rest of the roof is protected from heat. I have a cold flat roof ventilated by soffit vents on one side and no ventilation on the other side. Link to sweating and mouldy new cold flat roof video https youtu be ll2 8rxsykc cold flat roof ventilation corrected this is a followup video on how to fix. On the unventilated side there is no overhang just a solid facia board flush with the wall.