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Old 11-17-2011, 08:52 AM   #1
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Spray foam on Stone foundation


I live in Ontario, and building code states that spray foam insulation must be covered by a fire barrier. We plan on only insulation 1/2 way down the wall due to moisture and allowing the foundation to dry. We don't want to attach a a stud wall to our concrete floor because of the moisture. What is the best way to cover our foam.


Last edited by countryjaan; 11-17-2011 at 08:53 AM. Reason: missed words
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Old 11-17-2011, 08:58 AM   #2
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Spray foam on Stone foundation


I have a stone foundation as well and have looked into this quite a bit. I am not a fan of the method you described because it has a large potential for problems due to the moisture. I will be waterproofing and insulating my stone foundation walls from the outside to stop the moisture and keep the wall on the warm side to avoid freeze/thaw issues.

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Old 11-17-2011, 10:02 AM   #3
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Spray foam on Stone foundation


You should insulated well below the frost line.

Most spray foam companies will also have the ability to apply and ignition and/or thermal barrier.

Rigid foam is probably going to be cheaper if you were going to do it yourself.
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Old 11-17-2011, 04:15 PM   #4
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Spray foam on Stone foundation


The canned foam comes in a fire proof formula, I'd guess the commercial stuff would as well?
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Old 11-18-2011, 07:13 AM   #5
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Spray foam on Stone foundation


There are some foams that are "fire rated" but whether that is acceptable per code for that area is up to question.

I would check with the code in your area and for you application.

Most foams that are left exposed in accessible locations require some sort of protection barrier.
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