In concealed engineering projects—such as tunnels, subways, and underground utility corridors—waterproofing membranes serve not merely as barriers to isolate water, but also as “flexible components” that actively participate in regulating structural stress. As a specialized manufacturer in the field of geosynthetics, Shandong Hongyue Environmental Engineering Co., Ltd. (hereinafter referred to as “Hongyue Environmental”) has leveraged its deep technical expertise in EVA (Ethylene-Vinyl Acetate Copolymer) waterproofing membranes to formulate a scientific, rigorous, and standardized construction system. Through three core techniques—”precise material selection, meticulous welding, and standardized tensioning”—the company fully harnesses the exceptional properties of EVA membranes, including high elongation, low-temperature resistance, and tear strength, thereby establishing an impregnable waterproofing defense for a wide variety of engineering projects.
Step One: Precise Material Selection and Substrate Preparation—Laying a Flawless Foundation
A high-quality waterproofing project begins with precise control over materials. Hongyue Environmental’s EVA waterproofing membranes utilize premium Ethylene-Vinyl Acetate Copolymer as their primary raw material; they exhibit rubber-like elasticity, possess excellent low-temperature flexibility (maintaining pliability even in frigid conditions ranging from -30°C to -35°C), and boast high tear strength. Prior to construction, the substrate must undergo rigorous preparation: the base surface must be flat, solid, and free of any irregularities or sharp objects, while simultaneously ensuring it is devoid of standing water, oil stains, and dust. Depending on the scale of the project and its specific operating environment, Hongyue Environmental offers customized EVA waterproofing membranes in various thicknesses—ranging from 0.5 mm to 2.5 mm—to ensure an optimal balance between material performance and engineering requirements.
Step Two: Rigorous Welding Processes—Determining the Lifespan of the Waterproofing System
During on-site construction, the reliability of the waterproofing membrane depends 90% on the quality of the hot-air welding. Hongyue Environmental’s technical team emphasizes that the misconception of treating welding merely as a “covering operation” must be abandoned; instead, it must be prioritized as a core, critical process. Construction should be executed using specialized welding machines or hot-air welding guns, with the air outlet temperature strictly controlled within the range of 320°C to 380°C. Prior to welding, the overlap width between adjacent membrane sheets must be precisely controlled between 70 mm and 100 mm, and a steel wire brush must be used to thoroughly remove any surface dust or oxidized layers from the overlapping areas. During the welding process, high temperatures are applied to melt the surface of the EVA material, followed by the application of pressure to fuse the layers into a single, cohesive unit. Post-weld verification involves a rigorous three-step inspection process: First, a visual inspection is conducted to ensure the weld seam appears as a uniform, transparent, glass-like finish, free of any bubbles or wrinkles. Second, a mechanical peel test is performed; when tensile force is applied perpendicular to the weld seam, it must remain intact without cracking. Third, where necessary, an inflation test is conducted to verify that any pressure decay remains within the prescribed standard limits.
Step 3: Scientific Tensioning and Laying—Eliminating the Risk of “False Welds”
During construction in complex areas—such as tunnel crowns—the self-weight of the material can easily cause it to sag, leading to “false welds” (incomplete or weak seams). Hongyue Environmental Protection specifically emphasizes the necessity of employing a “zoned tensioning and segmented welding” methodology. This involves initially securing the waterproofing membrane to the substrate using specialized slings spaced approximately 300mm apart; tension is then released segment by segment, with welding performed simultaneously. This method effectively prevents the occurrence of false welds caused by material sagging under its own weight, thereby ensuring a tight, intimate bond between the waterproofing membrane and the primary support structure. Furthermore, EVA waterproofing membranes exhibit broad compatibility with various adhesives; during the detailed treatment of corners, pipe penetrations, and other intricate areas, specialized adhesives can be utilized to achieve rapid and effective sealing, thereby further enhancing the overall impermeability of the waterproofing system.
Leveraging this set of standardized construction techniques, Shandong Hongyue Environmental Protection’s EVA waterproofing membranes are able to fully demonstrate their core advantages—including exceptional resistance to hydrolysis, resistance to root penetration, and a long service life
Post time: May-09-2026
