40sf rerrof 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 def color (if cool roof required): na built-up roofing assembly system number per attached listing report (if applicable): na specific exemption from cool roof requirements (if applicable): r38 in existing roof required building inspector field verification (if applicable): r38 in existing roof note: self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.