Does rubber roof caulk remain flammable after it dries?

[jallen51]

We recently installed a class A chimney (Simpson Duratech) through an older flat rubber roof and did it with the help of some of the posts in this forum (and a lot from the seat of our pants). We used a roof support (rather than the box). Without getting into all the details. we used epdm patching material from Menards along with lots of cleaning of the old rubber and then a seam primer which we let dry before we attached the self-sticking patching material. We also used a rubber roof caulk that contained xylene and some of this is pretty close to where the chimney comes through the roof. We maintained the 2 inch clearance from all combustibles but we're worried that the caulk will remain flammable even after it dries. it is still pretty fumey even though it's been 4 days. Is there a problem with having this caulk close to the chimney? Thanks a lot for any advice and may the winter be kind to all of us.

 

[pen]

We recently installed a class A chimney (Simpson Duratech) through an older flat rubber roof and did it with the help of some of the posts in this forum (and a lot from the seat of our pants). We used a roof support (rather than the box). Without getting into all the details. we used epdm patching material from Menards along with lots of cleaning of the old rubber and then a seam primer which we let dry before we attached the self-sticking patching material. We also used a rubber roof caulk that contained xylene and some of this is pretty close to where the chimney comes through the roof. We maintained the 2 inch clearance from all combustibles but we're worried that the caulk will remain flammable even after it dries. it is still pretty fumey even though it's been 4 days. Is there a problem with having this caulk close to the chimney? Thanks a lot for any advice and may the winter be kind to all of us.

If it is the gray "water stop" it will never dry.

If is the the black caulk, it won't every dry rock hard.

The only thing I would be concerned about would be if it's the gray caulk as it has a tendancy to run when warmed.

pen

 

[jallen51]

It's the black rubber roof caulk that we're worried about. We did use a big bead of the water stop before we put the flashing down and yes, that was like a bubble gum nightmare... But the black rubber roof caulk had all sorts of warnings on it about flammability and it smelled unbelievably "fume-ish." We used it around the edges of all the epdm rubbering we had to do over both the roof support and then around the patching we put over the flashing. Maybe we're just worrying too much... But thanks a lot for you reply. All of you really taught us a lot before we went ahead with this installation. Hope it will pay off!