28 sq ft, re-roof for (e) sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material tpo proposed roofing material firestone tpo manufacturer single ply brand and model white color (if cool roof required) built-up roofing assembly system number per attached listing report (if applicable) specific exemption from cool roof requirements (if applicable) 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.