Reinforcement mesh is a key component of External Thermal Composite Insulation Systems (ETICS). It is embedded across the entire surface into the fresh reinforcement mortar, with at least two-thirds of its thickness submerged. The mesh distributes stresses caused by temperature fluctuations or building movement, preventing cracks in the render coat. Typical mesh sizes range from 4×4 mm to 6×6 mm, with area weights between 145 and 160 g/m². Additional mesh strips are required at corners, reveals, and diagonal window/door opening zones. Alkali resistance is regulated by standards and must be maintained permanently throughout the system's service life.