this post was submitted on 18 Jul 2023
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I'd pack some stainless steel wool around it before doing the expanding foam. This will prevent rodents from chewing through it, which they can do to the foam.
They make rodent-blocking foam but I trust the steel wool more
Weighing in to emphasize the importance of packing it with steel wool before using fireblock. It’s a game changer.
We had a hole like that that mice kept coming through and steel wool + foam ended that problem.