Specification Felt Roof Underlayment Atlas Roofing #30 Specification Felt Roof Underlayment #30 Specification Felt ASTM D4869 Type IV ASTM D226 Type II Atlas provides a complete selection of roofing felts or roofing paper Felt roofing underlayment is asphalt saturated and are manufactured with a high grade organic mat #30 Specification Felt roofing underlayment is a specification grade felt for use as an underlayment between the