空气屏障和蒸汽屏障的区别是什么?
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Is There a Difference Between an Air Barrier and vapor barrier?
Sherri Mccormick
Aug. 17, 2018Last updated: Aug. 2, 2020
Hi, I have an open beam house (no attic access) built in 1962. I live in cold, dry Edmonton Alberta. My low slope roof doesn't leak, however about once a year in the spring when we have a big temperature increase, I get water dripping from my interior open beam. Only lasts a few hours, I understand that my vapour barrier is compromised, and this is a result of accumulated moisture thawing. I'm reluctant to replace a perfectly good roof until I need to. It is a rubberized ashalpt membrane. Is there any other option available to me?
Your diagnosis seems pretty accurate with the exception that it would technically be theair barrierand not thevapor barrierthat is compromised, though it may well be the same product so that is kind of splitting hairs. This page explains it clearly -
The difference between air barriers and vapor barriers
几乎可以肯定的是，温暖潮湿的空气正在逃逸，然后在整个冬天凝结并沉积在你的屋顶上的冰，然后在第一个温暖的春天融化并降雨到你身上。尽管它可能令人痛苦，但至少你知道它，而且它有可能在发生后充分干燥，而不会造成重大损害。很多时候，当这种情况发生时，房主不知道，直到有一个结构失效或绝缘已变得无用。
To find and fix the problem - you might consider doing a blower door test (which pressurizes and depressurizes the house) to help find and seal leaks. And think of it more as limiting air leakage rather than stopping it, even the highest quality brand new home will still leak air, it’s a fact of life. If possible, it would be wise to have it inspected for damage before you seal it all up.
And we would be happy to work on further solutions with you but we need a few more details first. So, if you’re able to, please tell us the assembly from inside to out, or attach photos or even a drawing if possible. Here are some questions for you – when you say 'open beam', does that mean it's a timber frame? What is the interior ceiling surface, wood or drywall? Is there a poly vapour barrier? What type of insulation does it have, about how much, and is it vented - meaning is there space between the insulation and the underside of the roof deck? And a picture of the underside of the exterior overhang (the soffit) will help determine if it is vented.
你好。室内天花板是有质感的(爆米花天花板)，所以我认为它是在石膏板上。里面的横梁上覆盖着一层木皮，但我猜后面是木头。所有东西都关着，阁楼很小，也没有入口。20年前，他们吹进了8英寸的绝缘材料，价值为R32。春季泄漏似乎是横梁上的一个持续问题。我开始填塞爆米花天花板和横梁之间的缝隙，希望这能有所帮助。我有图片，但我不知道如何把它们贴在这篇文章上。
Hi Sherry, my apologies, if you send the pics to[email protected]我可以在那里看到他们，并把他们包括在我的职位上。