Pre-Installation Preparations

The most critical step prior to installation is conducting a 3D verification survey of the steel structure, with a specific focus on checking the flatness, spacing, and vertical alignment of the purlins. If height discrepancies exist among the purlins, forcing the installation will result in deformation of the sandwich panel facings, misalignment of the interlocking joints, and the creation of potential leak hazards. Furthermore, nylon lifting slings or forklifts should be used during unloading to prevent steel wire ropes from damaging the edges of the panels. When stacking panels, a slight incline should be maintained to facilitate drainage, and wooden blocks must be placed underneath to prevent moisture absorption.

Standardized Procedure for Roof Panel Installation

Roof installation must proceed against the prevailing wind direction—advancing from the leeward side toward the windward side—to ensure that all overlap joints face away from the wind and rain. Before laying the panels, the gutters and flashing must be securely fixed, and vibration-dampening rubber strips should be applied to the contact surfaces of the purlins. The very first panel laid must be precisely calibrated to a 90-degree right angle using a rangefinder and guide line; the accuracy of this initial placement determines the alignment of the entire roof system. Prior to interlocking the panels, a continuous strip of butyl sealant tape must be applied to the joint; the panels are then secured using self-tapping screws. The optimal tightening torque is achieved when the EPDM washer is compressed by approximately 30%; overtightening or undertightening will compromise the waterproofing effectiveness.

Key Considerations for Wall Panel Installation

The key to wall panel installation lies in preventing lateral water infiltration and ensuring airtightness. Before installation begins, a concrete parapet wall or metal flashing must be installed at the base of the wall structure. Wall panels must *never* be inserted directly into the soil; the bottom edge of the panel must be positioned at least 150 mm above ground level to prevent rainwater from wicking back up into the panel. After every five panels are installed, a plumb line or laser level should be used to verify vertical alignment and prevent the accumulation of alignment errors. Doorways, windows, and corner areas should be filled with polyurethane foam sealant, covered with corner trim, and treated with two layers of weather-resistant sealant.

Important Precautions

The use of circular saws or oxy-acetylene torches to trim panels on-site is strictly prohibited. The high heat generated by these tools will burn away the anti-corrosion coating, leading to rapid rusting of the cut edges; instead, handheld electric shears or cold-cutting tools must be used. The protective film covering the panel surfaces must be removed within 30 days of installation completion; otherwise, as the adhesive ages, it will bond tightly to the panel surface, severely compromising the aesthetic appearance of the finished structure. In high-altitude or cold-storage projects, metal bolts should be fitted with insulating plastic caps—or, alternatively, concealed self-locking sandwich panels should be selected—to interrupt thermal bridging and prevent condensation and dripping.

The proper installation of metal sandwich panels is not merely a matter of a building's aesthetic appeal; it directly impacts the facility's waterproofing, airtightness, and long-term durability. From meticulous pre-installation verification to the standardized construction of roofing and wall systems, and extending to such details as thermal bridge mitigation and the removal of protective films, every step requires strict adherence to industry standards. Only through rigorous, standardized execution throughout the entire process can the long-term stability and reliability of the sandwich panel system be ensured, thereby preventing common issues such as future leaks, corrosion, and condensation.

For more information needed or any inquiry,please feel free to contact Yumisteel team.