How did the flat roof and Dutch gutter fit into one scope?
A January 2015 Crockett replacement record combines composition shingles with a TPO membrane on the flat portion. The flat-roof work included two courses of FR-10 base sheet, and the scope explicitly extended the TPO around the Dutch gutter. Plumbing penetrations, four ventilation vents and ridge work were also listed.
For a homeowner comparing mixed-roof proposals, that gutter detail is useful because the work did not stop at naming a membrane product. The scope addressed where the membrane continued around the drainage feature. A new proposal should likewise identify the flat and pitched areas and their perimeter and drainage connections, including what existing gutter components remain. The materials describe that Crockett job; a new assembly needs its own current design and fire-rating check.