EZ-Roof Base is a high strength, reinforced, lightweight synthetic roofing underlayment which resists moisture and vapor transmission. EZ-Roof Base is designed for use on steep slope residential and light commercial roofing applications. It's also ideal for use on low-slope roof applications under self-adhered cap sheet. EZ-Roof Base works with standard roof materials, including shingles, tile, slate, metal and other roof composites.