Shed roof construction questions
My Dad and I want to build a shed roof off his garage.
I plan to bolt a ledger on the building right underneath the rafter tails overhang and attach the rafters to this, then maybe flash the space between the existing roof drip edge and the new roof.
With the dimensions that he wants (10' 4" rafter span) and 6'6" of headroom under the header at the low end, I've calculated the pitch would be appx. 1 7/16".
Question 1: Is this is a problem? Can this tolerate a metal roof?
If so, what is the best way to frame this? Can I do 2X8 rafters 2' OC with horizontal 2X4 purlins every X inches, then metal right on that? Or would it need to be sheathed? If it needs to be sheathed, we would probably do some sort of "rolled" roofing.
If the pitch is a problem, the only alternatives are to either hang the roof right off the rafter tails (I don't like this structurally or visually), or build the roof right on top of the existing roof, and lap whatever material under the asphalt shingles. I don't like this either.