Water Leakage in Cement Prefabricated Houses

Water leakage in cement prefabricated houses can be addressed through methods such as applying waterproof materials, laying waterproof membranes, chemical grouting, or joint sealing and plugging. The appropriate solution should be selected based on the severity of the leakage, and it is recommended to have the work carried out by professionals.

Water leakage in cement prefabricated houses often stems from the aging and failure of the waterproof layer at the joints between prefabricated panels, allowing rainwater to seep in through the gaps. Depending on the specific leakage situation, the following methods can be employed:

For minor leakage, applying waterproof materials is a relatively convenient option. Two coats of polyurethane waterproof coating or two coats of acrylic waterproof coating can be applied to the roof. However, it should be noted that polyurethane materials are not suitable for large-area applications, as material shrinkage or improper construction may lead to secondary leakage.

If the roof has not undergone waterproofing treatment, laying waterproof membranes is a more thorough solution. SBS waterproof membranes or asphalt pouring can be selected, and the membranes can be tightly bonded to the roof substrate using hot-melt or cold-adhesive processes to form a continuous waterproof layer. During construction, it is essential to ensure that the substrate is flat and dry, and that the overlap width of the membranes complies with regulations to prevent waterproofing failure due to substrate defects or construction flaws.

For linear leakage (such as leakage from cracks), chemical grouting is a professional leak-stopping technique. First, identify the leakage location, chisel out a V-shaped groove, and embed grouting nozzles. After sealing the groove with polymer cement mortar, clean the surface dust and spray polymer cement mortar to enhance adhesion. Once it has set, perform chemical grouting with water-soluble polyurethane grout, controlling the grouting pressure at around 0.3 MPa to avoid bursting the grouting pipe due to excessive pressure. This method can precisely fill the cracks and form an impermeable seal.

If the concrete surface only shows damp stains or localized water seepage, joint sealing and plugging is more appropriate. Clean the gap and fill it with a rapid-setting waterproof material (such as polymer cement-based waterproof coating) to quickly block the water seepage path. During construction, ensure that the gap is dry and clean, and that the material is filled densely to prevent recurrence of leakage due to uneven filling.

It should be emphasized that repairing water leakage in cement prefabricated houses is challenging, and the problem may recur due to material aging, structural settlement, and other factors. It is recommended to contact a professional waterproofing repair team for a comprehensive inspection and to develop a targeted repair plan based on the actual condition of the house to avoid exacerbating the problem due to improper operation.