20sqs reroof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material shingles proposed roofing material shingles manufacturer owens corning brand and model tru defintion duration color (if cool roof required) amber built-up roofing assembly system number per attached listing report (if applicable) na specific exemption from cool roof requirements (if applicable) na required building inspector field verification (if applicable) na note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.