Need to seal/caulk leak in metal chimney cap. It is about 30 feet
above fireplace insert. I don't know how hot it gets when there is a
fire in the insert. Is there a special sealant/caulk I should use or
would silicon be OK?
Some kind of refractory cement might be better if you can't judge the
temperature. There numerous varieties of 'furnace cement' in the
market. many at industrial supply places like Grainger. Consultation
with a masonry contractor might be useful as well. HTH
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