2600sf reroof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material asp shingle proposed roofing material oakridge asph shingle manufacturer owens corning brand and model oakridge color (if cool roof required) sierra gray ccrc id=0890-0013 built-up roofing assembly system number per attached listing report (if applicable) na specific exemption from cool roof requirements (if applicable) na required building inspector field verification (if applicable) na note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.