28 built up re-roof for (e) sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material built up proposed roofing material built up rolled roofing manufacturer owens corning brand and model color (if cool roof required) brown built-up roofing assembly system number per attached listing report (if applicable) specific exemption from cool roof requirements (if applicable) low slope2 12 required building inspector field verification (if applicable) low slope 2 12 note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.