Replace existing comp. Shinkles install low e therma gaf a comp shingles on existings sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material: shingles proposed roofing material: comp manufacturer: gaf brand and model: timberline hd 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): zone w r-4 instat. Above deck required building inspector field verification (if applicable): n a note: self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.