29 sf reroof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material: asphalt shingles proposed roofing material: asphalt shingles manufacturer: owens-corning brand and model: oakridge specific exemption from cool roof requirements (if applicable): no ducts in attic. Required building inspector field verification (if applicable): yes. Note: self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.