Plumber's Putty (?)

[les45]

I'm getting ready to install my Fantastic Fan and I plan to do it differently this time. After reading about the downside to silicone in some posts on this forum, I've decided to use Geocell ProFlex around the edges. I don't have any butyl tape left over from my last project so my question is can I use a bead of plumber's putty under the flange? I don't recall any previous discussions on this issue.

[halfdome, Danny]

My experiences with removing and replacing sinks in rentals, etc. is the plumbers putty becomes crumbly, something that shouldn't be exposed to the elements.
I have used this without any problems.
It comes in clear, white, black and if I remember correctly, brown & silver too.

Danny

[Tomterrific]

I did not want my vent 'glued' to the roof. I used Mortite brand rope caulk. This is a ribbon of about 5 strands of caulk that works similar to modeling clay. It stops water, conforms to any surface, and is removable in the future. I love this stuff as it is easy to work with and does the job. I used finish washers with the screws and filled the inside of the washers with the caulk. It squeezed out when the screw tightened, completely sealing each screw.

Tt