Venting A Cold Flat Roof

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. A cold roof really is colder than the rest of your home in the winter which means condensation is much less likely to develop. 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.

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That means the rest of the roof is protected from heat.

Venting a cold flat roof.

For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below. Ventilating a flat roof on a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through. Why don t cold roofs need to be ventilated. On the unventilated side there is no overhang just a solid facia board flush with the wall.

How do i add ventilation on this side to create through air movement. Their layer of insulation is beneath the roof decking and the roofing membranes. Air flow between vents will also be affected by the resistance to lateral flow. I have a cold flat roof ventilated by soffit vents on one side and no ventilation on the other side.

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