11 sq reroof 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 gaf brand and model timberline cool series color (if cool roof required) weatherd wood 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 note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.