20 sf re-roof () if a re-roof project is proposed, the following specifications apply. Existing roofing material concrete tile proposed roofing material asphalt shingles manufacturer owens corning brand and model oakridge drift wood color (if cool roof required) n/a built-up roofing assembly system number per attached listing report (if applicable) n/a specific exemption from cool roof requirements (if applicable) install r38 ceiling insulation required building inspector field verification (if applicable) yes plywood nailing note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.