Roofing Underlayment Ark roof underlayment certified for CCMC and CCRR by Intertek. It helps seal your home against water damage and other moisture infiltration which can cause mold growth and rotting deck boards. ArcnoContractor-Preferred Synthetic Roofing Underlayment ArmourHigh-Performance Anti-slip Roof Underlayment Armour AD ProHigh-Performance Self-Adhered Roof Underlayment