25 sf re-roof () if a re-roof project is proposed, the following specifications apply. Existing roofing material comp shingles proposed roofing material one layer of comp shingles over existing manufacturer gaf brand and model n a 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) n a required building inspector field verification (if applicable) n a