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Hi Doc, I have a 72 year old cabin I am redoing as a retirement project. I read an answer to a question about using foam insulation and your advice was not to use it. Can you explain why not? After removing loose mortar, I cob blasted, filled small voids with "Great Stuff", and repaired and replaced mortar chinking, was that a mistake? I also intend to pull up floors, install new to level, wanted to spray foam on foundation and joist, will come in contact with inside of bottom logs in crawl spac


The spray foam is an "open celled" foam and gives of gases that will bubble the latex chinking. I do not recommend it for use where it is in contact with wood. I have seen it start rot spots many times since moisture is absorbed into it.

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