Almost flat roof needs replaced
I have used a two ply SBS Modified bitumen specification for many years which incorporates a fiberglass reinforced first ply which is mopped in type IV hot asphalt, and a polyester reinforced, granular surfaced cap sheet that is torched (we like to say thermally fused) to the base ply. This has worked very well, and I have this type of roof in service now for over 15 years with literally no sign of deterioration. The benefit of this type of roof is that the roofer can get the building dried in relatively quick, then take his time with the cap ply. I agree with everyone else though regarding wood frame construction. No torch down there.
There has been a pretty significant swing toward the use of cold process with Mod bit though, and for the most part it seems to be working well. The peel and sticks will work, but the release sheets will drive you batty, and I would use cold process instead of these. Too much chance for air pockets.
Fully Adhered EPDM is another option that the OP should consider. He has good slope at over 1/2 inch per foot, and if he has little to no chance of mechanical damage that would be a good choice for him. He could do this project with one or two seams. I would use a one sided adhesive on his insulation, though, as it makes life a lot easier working with large sheets. If you keep the UV from hitting EPDM with a white acrylic coating, its life is yet to be determined. Use only Unreinforced EPDM at least .060" Thick.
Heat weldable white mechanically fastened single plies are available too but they require expensive welding equipment to install.
" A lot of men build things, and a lot of things fall down "
Last edited by jagans; 01-24-2013 at 10:07 AM.