2000sf reroof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material tile proposed roofing material new underlayment only manufacturer na brand and model na 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) 50% required building inspector field verification (if applicable) na note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.