28 sf. Reroof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material ashpalt shingles proposed roofing material ashpalt shingles manufacturer owens corning brand and model tru definition duration oakridge color (if cool roof required) amber, crrc product id #0890-009 built-up roofing assembly system number per attached listing report (if applicable) na specific exemption from cool roof requirements (if applicable) no required building inspector field verification (if applicable) yes roof sheating to be replaced if needed. Note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.