I always worry about the expanding foam expanding too much and blowing out stuff, or is there no need to worry about that? It's about 20cm deep.
Others can correct me if I'm wrong on this, but I don't think the foam exerts much force on expansion. It expands first, then sets. I certainly haven't seen anything move as a result of using it.
@Sharkstar started
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I always worry about the expanding foam expanding too much and blowing out stuff, or is there no need to worry about that? It's about 20cm deep.