6600sf re-roof for existing sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material built up proposed roofing material built up manufacturer firestone brand and model ultraply tpo color (if cool roof required) white built-up roofing assembly system number per attached listing report (if applicable) specific exemption from cool roof requirements (if applicable) system 3 required building inspector field verification (if applicable) note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.