A cold roof really is colder than the rest of your home in the winter which means condensation is much less likely to develop.
Venting a cold flat roof.
I have a cold flat roof ventilated by soffit vents on one side and no ventilation on the other side.
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.
Ventilating a flat roof on a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through.
For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below.
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.
How do i add ventilation on this side to create through air movement.
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.