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What product to use around radiator supply pipe in floor cavity?
I have somewhat large holes around my steam radiator supply pipes coming out of the floor, which are black iron and possibly galvanized. What material can I put around between the hardwood and the pipes to close the holes? I've had to widen the holes due to rubbing noise between pipe and sub floor during heating cycles and will cover with floor flanges but wanted to close the gaps with something flexible to insulate against noise, draft and bugs etc.
I've seen a lot of forums mention steel wool, but what kind, assuming not scrubbing pads.Also what about fire stop from the caulk aisle? Maybe a combo of the two? I just want to do it right once.
Then you in advance for chiming in