Adding deck roof to existing metal roof
What does the "Level Part of the Rafters mean?
What kind of roof is going on the new slope?
You need to cut the metal roof back up slope about six inches above where the plane of the new roof will tie in the the existing, Put a 2 x 10 or so plate accross the rafters at the tie in, and run the new rafters past the top plate of the outer wall to create a soffit and eaves beyound the outer wall You will cut a birds mouth in the rafters to sit flush on the wall. You will need S clips and a continuous apron to run up under the existing metal roof into the S clips which covers down over the ribs of the roof below. You would cut openings in the sheathing below the tie in to allow air flow up through the soffit, new and main rafters.
" A lot of men build things, and a lot of things fall down "