Qingdao Cornerstone Material Technology Co., Ltd. is a company specializing in the development and manufacture of breathing vapor-permeable products for construction and roof waterproof cushion. The company now has two major product series. One is breathing vapor-permeable products. The main product is DB110, which is used around the wall to make our wall breathe and block water from entering from the outside, at the same time, moisture in the house can be discharged to the outside. The second is the roof waterproof cushion. The main products are CS110 and CS180, which are used on the roof. The main function is to prevent rainwater leakage and protect the wooden roof from moisture and mildew.