30 sf re-roof () 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 tru definition duration color (if cool roof required) sierra gray crrc product id# 0890-0013 built-up roofing assembly system number per attached listing report (if applicable) n a specific exemption from cool roof requirements (if applicable) no required building inspector field verification (if applicable) yes complete re-roof replace roof sheathing only if damaged note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.