Venting A Cold Flat Roof

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.

Venting a cold flat roof.

Ventilating a flat roof on a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through. Air flow between vents will also be affected by the resistance to lateral flow. On the unventilated side there is no overhang just a solid facia board flush with the wall. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below.

That means the rest of the roof is protected from heat. 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. Their layer of insulation is beneath the roof decking and the roofing membranes. Why don t cold roofs need to be ventilated.