The flat portion needed its own sheathing and membrane
A Richmond replacement recorded in March 2025 combined CertainTeed Landmark Pro Solaris shingles with 60-mil TPO on the flat roof. The scope specifically included sheathing repair over that flat section as well as dry-rot repair, plumbing penetrations and ventilation. Another Richmond job removed an additional layer over only part of the roof. The roof areas and existing layer counts belong in the inspection plan and proposal, each listed separately.