- 9 sqft re-roof for julian realty if a re-roof project is proposed, the following specifications apply. Existing roofing material comp shingle proposed roofing material comp shingle manufacturer gaf brand and model hickory color (if cool roof required) n a built-up roofing assembly system number per attached listing report (if applicable) specific exemption from cool roof requirements (if applicable) less than 50% of roof and less than 20 sqft required building inspector field verification (if applicable) note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.