Self certification 21 sf hra re-roof for existing sfd. If a re-roof project is proposed, the following specifications apply. Existing roofing material: comp shingle to be completely removed proposed roofing material: asphalt shingle manufacturer: owens-corning brand and model: oakridge color (if cool roof required): shasta white built-up roofing assembly system number per attached listing report (if applicable): specific exemption from cool roof requirements (if applicable): no ducts in attic 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.