I’m installing a metal roof over 2 in of polyiso rigid foam insulation over an existing asphalt shingle roof.
I’m looking for a recommendation to fill the following gap: between the metal boot that surrounds a triple wall pipe that connects to my wood burning fireplace
The product needs to adhere to the polyiso foam board as well as the metal boot and last a long time.
Is there another product as cost-effective & long-life as roof cement?
Thanks for any help.