"Holland mesh" is commonly referred to as "welded wire mesh" or "electric welded mesh." Technical specifications dictate that welded mesh should ideally be manufactured using LL550-grade cold-rolled ribbed steel bars, though LG510-grade cold-drawn smooth steel bars may also be used. A single sheet of mesh should be fabricated using the same type of steel bar throughout. Welded mesh is categorized into two types based on shape and specifications: standardized and custom-made. For standardized mesh, while bar spacing and diameters may differ between the two directions, bars within the same direction must share identical diameters, spacing, and lengths, in accordance with relevant standards and regulations. The shape and dimensions of custom-made mesh are determined through consultation between the supplier and the purchaser, based on design and construction requirements as well as specific project conditions. Bar diameters range from 4 mm to 14 mm, with 0.5 mm increments permitted. Due to transportation constraints, mesh sheets should generally not exceed 12 m in length or 3.4 m in width.
The spacing of bars in the primary fabrication direction (longitudinal bars) should ideally be 100 mm, 150 mm, or 200 mm, while spacing in the transverse direction is typically 100 mm, 150 mm, 200 mm, or 300 mm (occasionally reaching 400 mm). When both longitudinal and transverse directions consist of single bars, the nominal diameter of the thinner bar must be at least 0.6 times that of the thicker bar (i.e., d_min ≥ 0.6 d_max). The shear strength of the weld points (in Newtons) must be no less than the product of 150 and the nominal cross-sectional area of the thicker bar (in mm²).
