We live in an "A" frame with a two story flat roofed section attached.

Don't ask. My husband and his dad built it in 1972.

Anyway, all kinds of leaking with the flat roofed section. It had tar and gravel on it, over some sort of fiber board over styrofoam, on top of tongue and groove. It leaked forever. Like since the house was built.

Even though it does not sound as if you are planning on solving the slope issue (we built a "false roof" with slope over the tongue and groove once the old roof was removed) we used metal corrugated roofing material that screwed into the plywood over the false roof. You put this stuff over tar paper, and all the fastners have little rubber "o" rings to prevent leaking. It also has insulation material to put at the ends of a section.

Anyway, this stuff isn't super exspensive, lasts forever and is pretty easy to work with. You can walk on it, unlike fiberglass. We've had it on the carport now for about 15 years, the main roof 2. I've seen it in white, green and red. We have white.

We measured our space, had them cut some custom peices - and the material was delivered on a pallet at the foot of our road. Ordered it online.

Now husband and I did the work ourselves, and we might have spent 3K on the whole thing, which included the dumpster rental, all the materials to repair the old roof and all the materials to build the false roof. Oh, and a lot of sawzall blades, since the old tar and gravel/insulation had to be cut up in sections and removed.

We did investigate rubber roofs. I had one on a flat roofed rental in California and it worked for about a year. Then it leaked.

Ann

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1972 280 SEL 4.5 "Henrietta" - The Learning Experience
1972 280 SEL 4.5 "Brunhilda" - Pretty Sponge for $100.00 Bills