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在纽约州的家中，什么是合适的蒸汽屏障位置?
Michael Boice
Jan. 15, 2022
我读了几篇关于蒸汽屏障和绝缘的文章。我现在住在纽约，我们的家建于1952年。我们正在增加一个带有2x6墙和2x12椽的全棚天窗。我们的计划是在墙壁和天花板上使用封闭的单元-这将有一个铜立缝屋顶。代码需要Tyvek类型的外包装，但我们想考虑在内部添加1/2”或1”聚苯乙烯以防止桥接。然后将薄片贴到聚苯乙烯上。
I do like closed cell, the excellerant is worrisome as it is a fairly potent green house gas..
thoughts?
thank you, Michael
We aren’t fans of spray foam at all, in part for the reason you mention about the potential toxicity of blowing agents但不可避免的是，未来有一天你会被分解，所有的材料都将被送往垃圾填埋场，而如果你用电池隔热材料来做，电池和螺柱都可以被重复利用。
About the toxicity, yes you are wise to consider that. Here’s our page all about it –
Spray foam insulation - is it a good green building material or potentially toxic?
But if you do use it, the foam itself acts as the vapor barrier so no other would be required. And yes, there would be no problem adding more rigid insulation to the outside. You can find Aspenite (OSB) with an inch of EPS foam attached to it which will save you a bit of effort and time installing.
Thank you Mike!
我没有考虑过拆除，但在遥远的将来，可能会有人决定拆除我的房子。
To clarify, placing the rigid foam on the outside wall is perferred - which is what the OSB/ESP does. What happens if the ESP is on the inside the a ceiling or wall? I might have thought that keeping the condition air - heat or AC - from penetrating the wall system might be the way to go? And this is really a learning question. Thank you!
Michael