19 sqft re-roof if a re-roof project is proposed, the following specifications apply. Existing roofing material shingles proposed roofing material shingles manufacturer gaf brand and model royal sovereign color (if cool roof required) desert sand built-up roofing assembly system number per attached listing report (if applicable) n a specific exemption from cool roof requirements (if applicable) n a 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.