Where should I put a vapor barrier / vapor retarder?
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我应该把阻气剂放在哪里?
Jeffrey Connell
March 14, 2020Last updated: Sept. 9, 2020
我打算给一座旧的木结构建筑增加外部绝缘材料。内墙将是木镶板附着在梁的外面。对于下一层，我想用防潮层包裹起来。接下来是6到8英寸的坚硬的岩棉绝缘材料，然后用带子捆扎外护套、木板和木条。我读到过，最佳方案是将三分之一的绝缘材料放在阻汽器内，三分之二放在外面。在包裹防潮层之前先铺上一层隔热层，然后在外面再铺上两层(或三层)，这样做有意义吗?Thank you.
Where are you located? I see the word ‘vapour’ with a U in it which is indicative of Canada, in which case it is a likely yes, the vapour barrier is best at the 2/rds point if possible, but where exactly in Canada are you?
从物理的角度来看，你的建议似乎是有道理的，因为你可以把VB放在2/3点，但这也是你的空气屏障吗?如果是这样，你需要一种方法来固定它，这样它就不会穿孔。
And another question, are you planning to have air conditioning as well? Here is our page that covers this issue-
Don’t install air conditioning in a home with an interior vapor barrier
If you aren’t planning to add air conditioning it may be a lot of effort to mitigate a very minimal risk, so the big question really is about whether or not you will have A/C, and where you live.
No air conditioning. North shore of lake Ontario.
It seems normal, practical, to put the vapour barrier on the outside of the interior wall, then add on the insulation. On the other hand it seems theoretical, or technical, to put on one layer of insulation, then the vapour barrier, and then the rest of the insulation. I am happy to go with theory over practice, just looking to guage a nod one way or the other.
Or to gauge, as the case may be.
没有空调，内部的蒸汽屏障并不是一个问题，坦率地说，即使有空调，如果你对它相当温和。这意味着，不要害怕在某个时候使用迷你分体式热泵来减弱热浪，当人们整个夏天都把自己的家保持在亚北极的温度时，问题就更严重了。所以如果是我，我会倾向于最简单的，这可能会保持它在内部，但是....
If you have it sandwiched between two rigid sheets that could work well also, as long as you have a plan for how to hang it since there wouldn't be any solid surface to attach it. I think you're good either way Jeffrey, seems like you have a good understanding of sensible construction.