Dongguan waterproof breathable membrane is primarily used in steel and wood structural buildings. The domestic market is rather chaotic, with many brands promoting online not having the capability to produce Dongguan waterproof breathable membranes; instead, they offer counterfeit and substandard products that are simply composite of nonwoven fabric and adhesive. Genuine brands recommend referring to the National Standard Design Collection 06J925-2: "Structural Design of Corrugated Steel Plate, Sandwich Panel Roof and Wall Construction (Part Two)."

The working principle of Dongguan waterproof and breathable membrane:

In the vapor state, water particles are extremely fine. According to the principle of capillary action, they can easily渗透 through capillaries to the other side, thus causing vapor permeation. When water vapor condenses into droplets, the particles become larger. Due to the surface tension of the droplets (water molecules pulling against each other), the water molecules cannot easily脱离 the droplets and渗透 to the other side, preventing water permeation and giving the vapor-permeable membrane its waterproof function.