I have two Dormers. It is clear that the casing and siding was done wrong. The casing on the corners is rotted after 7 years. The siding, Hardiboard, is dissolving near the roof. It looks like it was "butted" too close to the shingles. After I drove arround looking at other dormers, I noticed that many had this trim piece running down the dormer, between the roof shingles and the siding. These are not vinyl sided dormers. What is that? Am I missing something? I'm getting ready to pull the bad siding tomorrow. I have the new siding, and bought poplar casing boards. Any advice would be appreciated. Roof is 10/10 and difficult to work, but I have built and placed safety barriers and work platforms.
Mike