We always use a membrane system, but we use modified bitumen, a.k.a.
SBS. It is sold as roll goods, (NOT roll roofing) and comes in about 5
colors from different manufacturers. If you know what you are doing,
you can put this stuff down cold and not have any problems. We put it
on 0 slope roofs all the time in cold adhesive as our city is frowning
more and more (as are our clients) on our noisy, smokey, sulphur
But if you are forced to use shingles by a deed restriction or city
code, then there is a way. Cover the whole roof area in self
adhering/self healing ice and water shield over 15# tin capped felt.
Then nail your shingles on. The shingles are cosmetically more
pleasing and are UV resistant. The ice and water is uglier, and has no
UV resistance (unless the half lap kind), but it will "heal" around the
Do yourself a favor and have someone with experience do the tie in to
the existing roof. I sure make a lot of money fixing those...