Can you use a vapour retarder paint on the ceiling instead of using a poly vapour barrier?

Vapour barrier paint (or Vapor barrier paint in the U.S. ) is more of a solution for walls rather than ceilings to prevent the indoor vapour drive during hot humid weather. The reason as you may have read, is that when there is a vapour barrier in homes in hot humid climates that rely on air conditioning for human comfort, that vapour barrier is effectively on the wrong side in the cooling season. Learn it all on this page -

Building science for cold climates made easy - video

So we instead used aVvapor retarder prime / vapor barrier painton theEdelweiss Houserather than a standard 6 mil polyethylene vapour barrier partly because we already had an Air Barrier in place as you mentioned. For the ceiling we did use a 6-mil poly barrier, as building scientists don’t consider the ceiling to be as great a risk with the reversed vapour drive as walls.

所以你可能最好坚持使用聚蒸汽屏障，这通常很难让建筑检查员签字，所以我们建议你提前与建筑检查员检查，任何时候你想尝试一些不同的东西，这样你就不会因为他们不了解最新信息而被迫重新做任何工作。

As for the wall to ceiling junction, that is a tricky point to manage but you just need to select a high quality building tape toensure the continuity of your air barrier, we had our poly barrier go through the wall assembly and taped it to the exterior air barrier membrane.

这将是一个解决方案的新建设，您正在寻找一个蒸汽屏障的解决方案装修?如果你只是因为它是一个没有蒸汽屏障的老房子而担心，那么它实际上是一个很好的解决方案。但对于老房子来说，通常会有好几层上几代人留下的油漆，起到了防潮的作用。但多一层也不会有什么坏处。

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