Modified Bitumen Cap Sheet - It is made to withstand even the harshest environments. Web the vast majority of installed mod bit roof membranes have two plies, a base sheet and a cap sheet. Web our sbs is a premium modified bitumen engineered specifically for elasticity. So the average modified bitumen roof membrane (not including other roof system components) is about 300 mils (7.62 mm or 0.3 inches) thick and weighs around 2.2 pounds per square foot.
Web our sbs is a premium modified bitumen engineered specifically for elasticity. Web the vast majority of installed mod bit roof membranes have two plies, a base sheet and a cap sheet. So the average modified bitumen roof membrane (not including other roof system components) is about 300 mils (7.62 mm or 0.3 inches) thick and weighs around 2.2 pounds per square foot. It is made to withstand even the harshest environments.