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Quest · 11-16-13, 02:28 PM

I'm not aware of ordinary duct mastic able to handle the high heat on furnace exhaust piping.

I'd go with what MN Renovator suggested RE: masonry fireplace sealant instead (or any proper UL rated/fire rated sealant).

Q.

11-16-13, 02:28 PM	#10
Quest Apprentice EcoRenovator Join Date: Feb 2011 Location: Canada Posts: 109 Thanks: 13 Thanked 13 Times in 11 Posts	I'm not aware of ordinary duct mastic able to handle the high heat on furnace exhaust piping. I'd go with what MN Renovator suggested RE: masonry fireplace sealant instead (or any proper UL rated/fire rated sealant). Q.