Wall mesh fabric, also known as glass fiber wall mesh fabric, is a new type of alkali resistant product made from medium alkali or alkali free glass fiber yarn, woven into glass fiber mesh fabric as the substrate, and then coated with acrylic copolymer solution and dried. This product has the characteristics of stable structure, high strength, good alkali resistance, anti-corrosion, crack resistance, etc., and is easy to construct and operate. Mainly suitable for strengthening and preventing cracks on the internal and external surfaces of cement, gypsum, walls, buildings, and other structures, it is a new type of building material for external wall insulation engineering. Alkali resistant fiberglass mesh fabric is a reinforcing material for the external wall insulation surface layer. Its main function is to change the mechanical strength of the surface layer, ensure the continuity of the resistance of the facing layer, disperse the contraction pressure and insulation stress of the surface layer, avoid stress concentration, and resist surface cracking caused by natural temperature and humidity changes and accidental impacts. Therefore, alkali resistant fiberglass mesh cloth plays an important role and function in the external insulation system, so selecting a good fiberglass mesh cloth is also an important component of ensuring the comprehensive quality of the external insulation system.