Good morning all. This looks like a very imformative site. Glad I found it! I'm enclosing a deck on the back of house where two exterior walls meet at a 45 degree angle. The house is low to the ground and in order to have enough head room i'll have to make it free standing or either attatch several feet up on the roof. Problem is I don't know what to do with the valley. Existing roof is fiberglass shingles and I want the shed roof to be metal. Does anyone have any suggestions?