How do I create a complete air barrier using a vapour retarding primer?
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How do I create a complete air barrier using a vapour retarding primer?
Mihai Wilson
May 3, 2018Last updated: July 30, 2020
After reading about vapor retarding primers on ecohome I am sold on using this technique to air-seal my 50's house after doing renovation work. The missing part is how do I deal with recessed lighting and electrical boxes that penetrate the walls and ceiling. Any tips on this?
简单的回答是，你不能，蒸汽缓燃底漆不会做任何事情的漏气。它的作用是阻止水分扩散，即防止室内空气中的水分被石膏板吸收，渗透到墙壁组件中。
If you saw thebuilding science videoabout it where we used it at the Edelweiss House, we had an entirely separate air barrier in that wall assembly, a peel and stick membrane on the exterior sheathing (seen below).
The confusion over managing air and vapour movement comes from the fact that usually one product (6-mil polyethylene) is used as both the vapour barrier AND air barrier, butair leakage and vapour diffusion are actually two entirely different things.
I’m not sure how extensive your renovation will be or what stage you’re at, but if you’re stripping the walls to the studs you can either go with an exterior air barrier (in which case the vapor retarder primer is an option since you've dealt with air leakage), or an interior air/ vapor barrier like the standard 6-mil poly.
请随意给出你所处阶段的一些细节，以及你的雷诺数将有多大，如果你还不是太深入的话，我们希望能和你一起解决一些问题。