I bought some fireblock caulk that I plan to seal the gaps around my prefab fireplace with, but the gaps are large in some places. Do I just use regular backer-rod, or is there a special heat-resistant kind that I'm supposed to use? I didn't see anything like that at Lowes today.
Go to a store that sell woodstove and fireplaces. There is a fiber gasket material that would make a good filler. Comes in different diaemters.
I've already got a roll of automotive fiber gasket. If it's made to resist engine heat, it would probably be better than that typical foam backer-rod.
True but I would still feel more comfortable with something rated for higher temps. Most non-exhaust engine components shouldn't see over
230F; the only gasket that ever would would be the head gasket, and that has metal fire rings around the cylinders.If an engine uses exhaust manifold or header gaskets (some don't; they just have an ungasketed iron-to-iron joint between the manifold and head,) they are of a vastly different composition than the rest of the gaskets. Aftermarket "high-performance" ones are often just sheets of dead-soft copper.
nate
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