Self certification 46 sf re-roof () for (e) sfd if a re-roof project is proposed, the following specifications apply. Existing roofing material wood shake shingles proposed roofing material lt wt concrete tiles manufacturer boral roofing icc esr -1647 brand and model saxony 6 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) yes steep sloped roof cz-7 required building inspector field verification (if applicable) self certification note self-certification by a licensed contractor is acceptable if a signed letter on company letterhead is provided to the building inspector.