With metal roofing, the main body of the roof consists of paneling that may be ribbed, crimped, or otherwise molded for decorative effect and added structural integrity. There are even metal shingle options that are designed to resemble slate, cedar shake, or lapped siding. One thing that all these styles have in common is that they require various trim pieces to finish the roof.
Each trim component is designed for a different section of the roof. Valley pieces are installed wherever two downward sloping roof panels meet at an inward angle. Where a sloping panel meets a horizontal segment, transition trim is used. These components along with ridge caps, gambrel flashing, gable trim, and eave pieces are all pre-formed at the angles required for the residential application in question.
Many homeowners also choose to have the fascia provided in metal so that the overall style of the roof blends well with the siding. Fascia and soffits may be specified in a single piece to reduce the risk of leaks and make maintenance easier. The seams where metal meets metal are possible entry points for moisture, so the fewer separate pieces used, the better. Most contractors purchase roofing trim in 10’ segments, but there are a few manufacturers who can provide longer pieces upon request.