62 sf reroof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material comp proposed roofing material gaf grand sequoia manufacturer gaf brand and model gaf grand sequoia color (if cool roof required) charcoal built-up roofing assembly system number per attached listing report (if applicable) na specific exemption from cool roof requirements (if applicable) steep sloped with min r-38 or new ceiling insulation 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.