Self-cert 4400sf re-roof for existing sfd and patio cover if a re-roof project is proposed, the following specifications apply. Existing roofing material wood proposed roofing material asphalt manufacturer gaf brand and model timberline color (if cool roof required) hickory built-up roofing assembly system number per attached listing report (if applicable) specific exemption from cool roof requirements (if applicable) required building inspector field verification (if applicable) no-self certification procedure note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.