Exterior foam board - re-siding a home

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Posted by: from London
3/23/2016 at 10:23:41 AM

It's seems to be common practice to install foam board insulation when re-siding a home. I have had the same installation on mine but I am concerned about the issue of a double vapour barrier considering I also have plastic on the interior walls under the drywall. The product they installed on the outside is called Atlas Energy Shield 1" thick under Hardie Plank. I asked the installer about it and basically said I need not worry. This came up as I was in the process of installing 2" xps foam on my basement rim joists and got to thinking am I sandwiching the rim joist between 2 vapour barriers and will that cause an issue.

Have I set myself up for the exterior walls to rot and mold? Anything to do other than taking all the drywall down and removing the interior vapour barrier.



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Date/Time3/23/2016 at 1:11:42 PM

You're fine not getting into a essay on it other then to reassure u that it's not a double vapour barrier Vapour is supposed to be on the warm side but because of the climate the warm side varies from season to season. If you have concerns a HRV system is your mind comfort solution.



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