Best Seller | CertainTeed WinterGuard Sand Underlayment Single Roll The CertainTeed WinterGuard is Composed of an SBS-modified asphalt that is saturated in the membrane and coated over the membrane. This makes a tough reinforcement that is self-adhering and waterproof. The top surfaces of the Winterguard sand and... more | | $129.80 $116.82 FREE shipping go to store |