What is the effect of plastic film on waterproof coiled material?
As an insulating layer of asphalt base (to prevent production and adhesion during roll formation)
As a protective layer of asphalt base (delaying the aging process of asphalt waterproof layer in use)
As a waterproof reinforcing layer (the plastic film itself is waterproof, but the strength is poor, and the asphalt layer plays a complementary role)
