TITANIUM UDL-30 is a highly engineered, mechanically attached, coated woven synthetic roofing underlayment for sloped roofs. TITANIUM UDL-30 represents the future in felt replacement technology, and is used in conjunction with TITANIUM PSU-30 self adhered underlayment offering the sloped roofing industry a truly revolutionary system of safety, security and simplicity… Two products (UDL-30 & PSU-30) are ALL your roof needs.