GB/T 23457 - 2009 formulates specifications around pre-paved/wet-paved waterproof membranes. It defines product terminology and clarifies classification and labeling rules. Technically, key indicators such as coil thickness, tensile performance, water impermeability, and low temperature flexibility are required. The standard also provides detailed test methods, covering various performance testing processes, as well as product inspection rules. The standard helps manufacturers control product mass, which is convenient for engineers to select models according to different needs, to ensure that pre-paved/wet-paved waterproof membranes play a good waterproof effect in building waterproofing projects, and to ensure building waterproof mass and durability.