Profile: Tamko Building Products, Inc. is a manufacturer of residential & commercial roofing products, waterproofing, composite decking & railing systems and cements & coatings. Our Tamko TW Flash-N-Wrap-40 reflective sheet membrane is a 40-mil-thick flexible self-adhering rubberized asphalt sheet membrane with a reflective aluminum surface and a removable treated release on the adhesive side.