Ive got a 12w x 24 semi-attached garage converted into living space. Its got a low slope shed style roof (4rise x 12run, peak is 8' from front) the existing shingles are shot. Its currently tarped. Inside construction is 2x6 rafters on 24" center, rafter-mate between rafters for airflow, r16 unfaced, and 1/4" plywood screwed to the rafters for a ceiling.The decking topside appears to be 6"wide plank, then felt paper, then 3 tab. Location is northeast. We get snow + ice.
Seems to me that shingles on a low slope are a bad idea. The ice-dams that developed were non-trivial. Main house roof has two sections , one of which has this slope and torch-down asphalt was used there.
I'm thinking steel roofing. DIY. I'd like to install over the existing shingle (sans tarp). What do i need to consider or research? my uninformed plan is plastic vapor barrier, 1x3 lateral slats, then steel screwdown roofing.
What considerations should I keep in mind, and does anyone know of a good DIY website/link for steel roofing?
Thanks , Mike