20 sf re-roof (hra) for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material: comp shingle proposed roofing material: comp shingle manufacturer: owens corning brand and model: oakridge estate grey color (if cool roof required): grey built-up roofing assembly system number per attached listing report (if applicable): n a specific exemption from cool roof requirements (if applicable): n a required building inspector field verification (if applicable): n a note: self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.