Waterproofing Methods for Prefabricated Panel Houses

For waterproofing prefabricated panel houses, the following methods can be referenced: First, address the gaps between panels, and then use the 'three-coating and two-layering' technique to select appropriate waterproofing materials for construction.

Gap Treatment Between Panels

The key to waterproofing prefabricated panel houses lies in resolving the gaps between panels. Since prefabricated panels are prefabricated components, gaps inevitably exist during assembly. If left untreated, rainwater can easily seep into the interior through these gaps. It is necessary to pour a 5-8 cm thick layer of concrete on the surface of the prefabricated panels and lay steel wire mesh within the concrete. The role of the steel wire mesh is to enhance the concrete's crack resistance, preventing cracking due to temperature changes or structural settlement, thereby avoiding the failure of the waterproof layer. After pouring the concrete, it must be adequately cured to ensure its strength meets standards, forming a sturdy base layer that provides a stable foundation for subsequent waterproofing construction.

'Three-Coating and Two-Layering' Waterproofing Technique

Waterproofing construction should adhere to the principle of 'three-coating and two-layering,' which enhances waterproofing effectiveness through the superposition of multiple material layers. For large areas, it is recommended to use asphalt as the primary waterproofing material. Asphalt has strong adhesive properties and good weather resistance, making it suitable for large-area waterproofing such as roofs. During construction, the base layer must first be cleaned to ensure it is free of dust, oil, and other impurities. Then, evenly apply the first layer of asphalt (first coating), and after it dries, lay a layer of felt (first layering). The felt enhances the tensile strength of the asphalt layer, preventing cracking. Next, apply the second layer of asphalt (second coating), covering the felt and filling any gaps, followed by laying a second layer of felt (second layering). Finally, apply the third layer of asphalt (third coating) to form a dense waterproof layer.

For small areas or detailed parts (such as internal and external corners, pipe roots), it is recommended to use JS waterproofing coating or leak-stopping agent. JS coating is a water-based environmentally friendly material that is easy to apply and can form an elastic waterproof membrane, adapting to minor deformations in the base layer. The leak-stopping agent, on the other hand, has the characteristics of rapid curing and high strength, making it suitable for repairing cracks or local leakage points. During application, use a brush or roller to apply evenly, ensuring no missed spots, and the thickness should meet the product instructions.

Construction Precautions

After completing the waterproof layer construction, a closed-water test (or roof watering test) should be conducted to check for any leakage points. If any are found, they should be repaired promptly. Additionally, it is recommended to lay a protective layer (such as cement mortar or tiles) on top of the waterproof layer to prevent ultraviolet aging or human-induced damage that could compromise the waterproofing effectiveness. During daily use, regularly inspect the roof drainage system to prevent long-term pressure on the waterproof layer caused by water accumulation.