I will be embarking soon on a remodel of a 1908 builder bungalow in Portland, OR. The project involves an attic conversion – with the addition of two shed dormers – and reroofing the remainder of the 7:12 pitch roof. I am working with the owner to determine whether to use comp. shingles or metal roofing (standing seam or coorugated). Does anyone have familiarity with metal vs. shingles, pro and con? The primary concerns/issues are cost, expected service life, & ease of installation / constructability. We’d also like to know how these options compare from a “green” standpoint.
Are there other options we should consider?
Note that the existing roof is a simple front-to-back gable, with only a few vent penetrations and one 8-10″ penetration at a s. steel chimney. The dormers ideally would have only a 2:12 pitch (to allow more headroom inside), however I understand this may present a problem with some (most?) roofing materials.