Thanks for the reply and info.
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Sometimes we used the spray foam to fill small holes but I never really like doing that because the foam expands a lot and then becomes less dense - sort of spongy. Spongy foam is hard to shape
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That sounds like what I experienced. I'm going to order the two part pour foam from fiberglass supply this week. I'll let you know how it goes. Hopefully the foam will be easy to shape. I'll keep this thread updated with progress.