Q&A Forums
spraying foundation walls Post New Topic | Post Reply
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bryan jackson
Posted: Dec 03, 2007 10:12 PM
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spraying foundation walls
Should the foam be coated with a tar-like product if spraying the exterior side of a basement wall, or is it ok to just spray foam and backfill?
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mason
Posted: Dec 04, 2007 07:10 AM
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That depends on where you are and how low the water table is. Studies performed in Canada on insulation on foundation walls demonstrated that 2 lb density SPF installed the exterior of block walls without any coating did not absorb water. However, if you are down in Louisiana or Houston, a water proofing coating such as asphalt would be recommended. Check out the SPFA technical document Below Grade applications with SPF at sprayfoam.org |
