2,0 sqft re-roof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material asphalt shingles proposed roofing material asphalt shingles manufacturer owens corning brand and model oakridge color (if cool roof required) n a built-up roofing assembly system number per attached listing report (if applicable) n a specific exemption from cool roof requirements (if applicable) steep slope in cz 7 required building inspector field verification (if applicable) yes- old roofing to be removed note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.