Installed the Maxxair fan, odd find

rhagfo wrote:

mike-s wrote:

gaymeadowsman wrote:
there was no Butyl tape. It had the same caulk that was on the top side covering the screws and flange. I don't guess it is anything "wrong" with it,but of all the videos and how to's I had read they all had butyl tape under the factory install.

You're lucky. A lot of the sealants cure to be almost unremoveable, making it near impossible to remove whatever without damaging the roof. Good quality butyl tape (Dicor makes that, too) under, sealant on top. That way you can carefully cut through the sealant around the edges and easily remove whatever since the butyl won't act like a strong adhesive. That applies double for things with wide flanges, like the base for an antenna.

Why do you feel the need for the butyl tape if it didn't leak with the old vent? When I replaced the vent in our kitchen just lap sealant, easy removal, went back in the same way, dry to roof, then careful application of self leveling Dicor sealant.

Whoosh. The GP described sealant under the fitting, "It had the same caulk that was on the top side." I commented that in comparison, using butyl tape is the proper method, since it doesn't glue the fitting to the roof.