#40 Organic Base sheet is manufactured by superior quality organic felt. The organic sheet is saturated with asphalt and then coated with oxidized asphalt and covered with fine ceramic granular fines. The granular fines prevent sheet from sticking in the roll.
Manufactured to comply with ASTM D 2626 standards and can be used as a residential or commercial roofing underlayment
Excellent product to be used as an roofing underlayment for clay or concrete tiles
Product is applied over flat roof deck or insulation and can be left exposed for up to 180-days