A different wall and ceiling vapour barrier treatment in the Eco-home: How come?
In the Leeds V4 Platinum house the wall construction vapour treatment was different from using poly in the roof...having convincingly demonstrated why the wall vapour barrier system and wall construction was better for a Canadian climate...would one not then do the same for a roof?
Hi James, there isn't the same inward vapor drive through ceilings that there is throgh walls, so it's a bit less of a concern with the ceiling. Driving rain can wet walls, then the sun can bake the moisture right into it, and there just isn't the same amount of space inside a wall system as there is in a ventilated roof to remove moisture. Great question by the way.