7 sqft re-roof for existing sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material: shake to be removed at work area proposed roofing material: comp shingles specific exemption from cool roof requirements (if applicable): no ducts in attic required building inspector field verification (if applicable): no note: self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.