A different wall and ceiling vapour barrier treatment in the Eco-home: How come?
James TurkNov. 22, 2021
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?
Responses (1)
Emmanuel Cosgrove8 months ago
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.
Vapor retarder latex based primers can be twice as effective as the requirements laid out in many building codes regarding vapor barriers requirements. Vapor Barriers in walls…
3/4 inch OSB sheathing on the interior can be an excellent air barrier and a great vapour barrier as well. There has been a steady evolution in the way we build homes over the…
Air leakage is responsible for a large portion of the heat loss and moisture damage in walls. Watch more green building videos on the Ecohome YouTube channel here The Ecohome…
Can a house be too airtight? No it cannot. The difference between air barriers and vapour barriers is often confused. Also confused, is which one is more important. The…
Approximately 100 times more water vapour is carried into our walls by air leakage than is carried by vapour diffusion. That makes air barriers 100 times more important than…
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.