16 sq ft re-roof for existing sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material: composition shingles proposed roofing material: class a fiberglass shingles manufacturer: gaf brand and model: timberline color (if cool roof required): barkwood built-up roofing assembly system number per attached listing report (if applicable): na specific exemption from cool roof requirements (if applicable): na 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.