Stan in Oly, WA
Well-known Member
My natural gas furnace exhausts and gets its intake air through 2" PVC pipes. Recently I discovered dripping water where one of the pipes connects to the furnace. When I got onto the roof, the problem was very obvious. The sealant had failed where the pipes come through a metal boot. The sealant was clear silicone. I peeled it off the pipes and the metal boot, and cleaned everything well. Now I'm wondering what to use as a sealant. We bought this house in 1998, and a new furnace had been installed years earlier. That means that the silicone caulking lasted well over twenty years. Silicone would be easy for me to use to re-caulk. It's readily available, I've used it a lot, and I've got proof that it lasts more than 20 years. At my age, 20 years is likely to be longer than I've got, almost certainly longer than I can continue to live in this house. Is there something else that is proven to last longer and better? I'd much rather use something that I'll get a sure 20 to 25 years out of than something which should last much longer, except that it might not.
Stan
Stan