2100sf re-roof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material asph proposed roofing material asph manufacturer owens corning brand and model durration color (if cool roof required) amber 089-0-0009 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.