[quote=“Stubs”]Thanks for the photos. So, the second photo I posted is not good? Why specifically?
Are there any acceptable options other than the torch method? I don’t have the appropriate tools and for such a small project, just one roof vent, it doesn’t seem to make much sense to acquire them. Also, I am pretty sure I’d burn my house down![/quote]
First of all, you will need and want to install at least two vents, unless you have soffit vents or some other means to provide an intake and exhaust.
The second photo isn’t bad, but it is smooth-surfaced and does not cover the entire flange. While it would be acceptable, your first photo is preferred.
Since you don’t have the means or methods to torch down mod. bit., and you asked if there is another method, the answer is yes. You can create composition flashing by alternating courses of roofing cement and felt or a heavy, reinforced flashing membrane. In a pinch, you could apply roofing cement around the penetration and coat the back side of a piece of roofing felt already cut to fit around the pipe penetration. Rub the two pieces together, and yes you are going to make a mess the first time you “play” with roofing cement. Be sure to have some hand cleaner and plenty of rags available ON THE ROOF.
After you have applied the first ply of felt, you can either install another ply the same way, or you can move on an install the heavy base membrane. Something like a 40# base sheet could work if needed. Coat the top of the roofing felt that is in place, coat the underside of the base membrane (which should be cut at least 2-inches wider in all four directions than the underlying felt) and rub it into place. In your situation, I would probably then coat the base sheet with roofing cement, and then in about a week or two I’d coat the cement with an aluminum or elastomeric coating. Though you could get away without coating the flashing, but it won’t last as long.
Here are some photos that don’t show a pipe flashing, but show a core being patched with roof cement and reinforcement fabric. And no, this is not sufficient for flashing in a turbine vent, as this patch is only meant to be temporary. Besides, for those with a sharp eye, the patch is an asphalt based roofing cement on a coal-tar pitch roof.
Though you have to do it a little differently because you will be flashing in a pipe rather than patching a hole, the principle of building up with membrane and mastic is the same:
Photo 1 - Roof core take to inspect roof sandwich and roof deck.
Photo 2 - Core set back in place, but set in roof cement.
Photo 3 - Roof cement applied over patch area after core was set back in place and sealed.
I’ll continue in another post.