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Air barrier for existing masonry party wall?

athan_chiz | Posted in Green Products and Materials on

Hi.  I’m wondering if anyone has any experience with spray-applied air barriers for existing masonry party walls. 

I’m in Philly designing Passivehouse infills and we need a way to continuously air seal the face of adjacent brick party walls to maintain our envelope.  We usually use closed cell spray foam, but it is not accepted as a reliable air barrier.  Any product or method suggestions will be greatly appreciated.  Thanks.

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  1. GBA Editor
    Martin Holladay | | #1

    For more information on using spray foam as an air barrier, see this article: "Air Leakage Through Spray Polyurethane Foam."

    If closed-cell spray foam is installed at a thickness of 3/4 inch or more, it's an air barrier.

    If for some reason you want to use a different product, a fluid-applied water-resistive barrier would work. For more information, see "Housewrap in a Can: Liquid-Applied WRBs."

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