90 sq ft re-roof for existing sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material clay tile proposed roofing material clay tile - boral manufacturer boral brand and model 1017 color (if cool roof required) yes 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) n a note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.