Substrate preparation is fundamental to ensuring a tight bond between the mechanical rock wool board and the substrate. Before construction, the substrate wall surface must be thoroughly cleaned to remove oil, dust, loose materials, and other impurities. Old coatings or mold should be removed, ensuring the substrate surface is clean and firm. If cracks or pits exist in the substrate, they must be repaired in layers with cement mortar, and pits should be leveled with leveling mortar. After repair, the flatness should be checked with a straightedge or laser level to ensure the overall error is within acceptable limits. The flatness of the substrate directly affects the laying effect of the rock wool board. If there are hollow areas or unevenness in the substrate, gaps will appear between the rock wool board and the substrate, reducing insulation performance.
The selection and application of the adhesive are crucial to ensuring a tight bond between the mechanical rock wool board and the substrate. A special adhesive compatible with the rock wool board material should be selected, such as a cement-based adhesive or polymer-modified mortar, whose bonding strength and weather resistance must meet design requirements. During construction, the adhesive should be evenly applied to the back of the rock wool board using a dot-and-frame method or a strip-and-strip method to ensure the bonding area meets design requirements. For the dot-frame method, a strip of adhesive should be left around the perimeter of the rock wool board, with evenly distributed dot-shaped adhesive points in the center. For the strip method, the adhesive should be applied horizontally and evenly using a notched trowel to form a strip-shaped adhesive layer. The adhesive thickness should be moderate; too thick and the board may slip, too thin and the adhesion will be insufficient.
The layout and cutting of the mechanism rock wool board must strictly follow the design requirements. Before construction, a layout design should be made based on the wall dimensions and rock wool board specifications to minimize cutting and avoid material waste. The rock wool board should be laid horizontally from bottom to top, with the joints of upper and lower layers staggered at a certain distance, and the joint width controlled within a reasonable range. For special areas such as door and window openings and corners, a whole piece of rock wool board must be cut to shape, with the cut perpendicular to the board surface to ensure a tight fit. Professional tools should be used during cutting to ensure a smooth cut surface, avoiding burrs or deformation that could affect the splicing quality.
Optimizing the fixing method can further enhance the adhesion between the mechanism rock wool board and the substrate. In addition to adhesives, a bolt system is required for mechanical fixing. The number and location of bolts must be determined according to design requirements, generally not less than the specified number per square meter, and the anchoring depth must meet standards. During installation, the bolts should be perpendicular to the wall surface to ensure a tight bond between the rock wool board and the substrate. For high-rise buildings or areas with high wind loads, the number of bolts should be increased or a denser arrangement should be used to improve the wind pressure resistance of the rock wool board.
Joint treatment is a crucial step in ensuring a tight bond between the mechanical rock wool board and the substrate. The joints must be filled tightly with sealant to prevent thermal bridging. For larger gaps, rock wool strips can be used to fill them, ensuring a smooth and seamless joint. The four corners of door and window openings should be cut from a single piece of rock wool board to avoid splicing and reduce stress concentration. Reinforcing mesh or corner guards should be used at internal and external corners to ensure that the corners are smooth and vertical.
Environmental control during construction has a significant impact on the bonding effect between the mechanical rock wool board and the substrate. During construction, weather conditions must be considered to avoid work in rain, strong winds, or extreme temperatures. High or low temperatures can affect the curing effect of the adhesive, leading to insecure fixing of the rock wool board. If construction must be carried out in a low-temperature environment, insulation measures must be taken, such as heating the adhesive or extending the curing time.
Quality inspection and adjustment are the final steps to ensure a tight bond between the mechanical rock wool board and the substrate. After construction, the flatness of the rock wool board must be thoroughly checked with a straightedge or level to ensure that the overall error is within the allowable range. Any uneven areas must be adjusted or repaired promptly. Simultaneously, the firmness of the anchors and the adhesion of the adhesive must be checked to ensure there is no loosening or detachment.
