- 21 sqft re-roof for (e) sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material asphalt shingles proposed roofing material manufacturer asphalt shingles brand and model owens corning color (if cool roof required) tradefinition duration 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) note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.