Waterproof membrane is mainly used in the top floor of the building and the floor of the toilet waterproof layer, because the waterproof layer is generally "hidden" project, even through the general closed water test is difficult to identify the overall quality and durability. As a result, some unscrupulous businessmen are shoddy and deceive consumers with the hidden rule of "OK without missing a year", resulting in more and more quality disputes and complaints. In order to further strengthen the supervision of the quality of people's livelihood products and deepen the construction of "safe quality supervision", the Quality Supervision Bureau of Chaohu City, Anhui Province organized a special law enforcement inspection on waterproofing membranes in the second quarter. This inspection focuses on whether the manufacturers of waterproofing membranes sold and used on Chaohu market and construction sites have obtained production qualifications, crack down on the inferior waterproofing membranes produced and sold by unlicensed enterprises, and purify the sales market of waterproofing membranes. At present, three cases have been filed to investigate and deal with the sale and use of waterproofing membranes produced by enterprises without production qualifications.