50 sqft re-roof to (e) sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material comp shingles to be removed proposed roofing material comp shingles manufacturer owens corning brand and model tru def duration color (if cool roof required) oyster shell 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.