Mark wrote:
How long can I leave these on the roof? They are in bundles plastic
wrapped no more than 2 high - temperature in 60's, sometimes low 70's.
They have been up there for 3 weeks so far and seem ok, a little sticky
when hot but they separate ok when it cools down

Yer pushin' it. Are you keeping them under a tarp, at least? Air temp
isn't the problem, sunlight is. There is a reason lumber yard keeps
these under roof. Unless the dots melt enough to get past the plastic
guard strip, they should still work okay. A bigger concern is making a
bowed spot in your decking or even a rafter- that is a lot of dead
weight in one spot. And is rest of roof in tarpaper, or are you putting
on a second layer? Neither is a really good idea- the tarpaper isn't
supposed to be the weather roof for more than a few days, and overlays
in general are to be avoided, for lots of reasons.

--
aem sends...