Posted by db4600 on April 19, 2020 at 09:15:05 from (174.219.129.231):
In Reply to: Re: House Wrap posted by Stephen Newell on April 19, 2020 at 06:56:16:
Vapor barrier on both sides of an insulated cavity is a no no and will promote mold. Building paper is not a vapor barrier, Polyethylene is. If it is insulated you want one vapor barrier either one side or the other of the insulated cavity. Typically it is placed on the heated side of the assembly because the warm side of the insulated space does not promote condensation on that side and lessens the chance of mold. If spray foam is used it changes this dynamic. Open cell foam still requires a vapor barrier. Closed cell does not.
Masonry assemblies have moved toward a spray on air barrier outside and insulating foam on the exterior. Steel studs are tough because of the cold transfer of the stud through the insulation. The latest trend is spray foam cavity with foam board exterior behind exterior finish, but this affects the sheathing between the 2 foams. I’ve seen most recently only air barrier and foam at the exterior to move the dee point away from the sheathing envelope.
With all my babble it ultimately depends on the type of assembly and the use of the space. A shed will perform different then a residence or a commercial use building.
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