TITANIUM UDL-25 PLUS is a highly engineered, mechanically attached, coated woven synthetic roofing underlayment for sloped roofs. TITANIUM UDL-25 PLUS represents the future in felt replacement technology, and used in conjunction with TITANIUM PSU-30 self adhered underlayment for ice damming and valley areas, a truly revolutionary system of safety, security and simplicity… Two products (UDL-25 PLUS & PSU-30) are ALL your sloped roof needs.