A SBS modified bitumen high temperature roofing underlayment reinforced with a textured skid-resistant polyethylene film; specifically designed to be self-adhered on sloped roof surfaces as secondary seal under shingles or tile; self-seals when penetrated by mechanical fasteners or roofing nails; prevents lateral moisture migration; provides premium anti-resistant textured blue film surface for applicator safety; provides split release backing for fast application; meets ASTM D1970 standard and is ICC listed.