Waterproofing for Prefabricated Slab Houses

Waterproofing for prefabricated slab houses requires systematic treatment tailored to their structural characteristics. The specific measures are as follows:

1. Fine Repair of Base Layer Defects The surface of prefabricated slabs often exhibits issues such as unevenness, sanding, peeling, and fine honeycomb cracks, which can serve as channels for rainwater penetration. A comprehensive inspection of the base layer should be conducted first to remove loose and aged parts. Special repair materials (such as polymer cement mortar) should be used to fill cracks and holes, ensuring a flat and dense base layer. After repair, roughening treatment should be performed to enhance the bonding strength between the waterproof layer and the base layer, preventing the waterproof layer from peeling off due to base layer loosening.

2. Rigid Filling and Reinforcement of Slab Joints The joints between prefabricated slabs are the primary channels for water seepage. Rigid waterproof materials (such as epoxy resin or polyurethane sealant) should be used for filling. Before filling, debris within the joints should be cleared to ensure they are dry and clean. During filling, construction should be carried out in layers, with each layer not exceeding 5mm in thickness, and compacted with special tools to form a continuous waterproof barrier. Rigid materials can effectively resist joint displacement caused by temperature differentials and building settlement, preventing crack enlargement.

3. Full-Area Waterproofing Local joint repair techniques cannot accommodate the dynamic deformation characteristics of prefabricated slabs. Therefore, national standard thickened membranes (such as SBS modified bitumen waterproof membranes) should be used for full-area coverage of the roof. Before membrane application, a base treatment agent should be applied to enhance adhesion. During application, it should be laid from low to high areas, with an overlap width of not less than 100mm. Hot-melt or self-adhesive methods should be used to ensure tight bonding between the membrane and the base layer, as well as between membrane layers. Full-area coverage forms a continuous waterproof layer, effectively resisting stretching and deformation.

4. Specialized Exposed Waterproofing for Gutters Gutters are prone to long-term water accumulation and UV exposure, causing conventional waterproof materials to age and powder. Specialized exposed waterproof coatings (such as acrylic waterproof coatings) or membranes (such as TPO waterproof membranes) should be used for reinforcement. Before construction, debris within the gutters should be cleared to ensure smooth drainage. The coating should be applied in 2-3 coats, with a total thickness of not less than 1.5mm. The membrane should be installed using mechanical fastening methods, with proper sealing at the edges to prevent rainwater backflow.

5. Standardized Precision Construction Waterproof materials should be selected from national standard genuine products, such as Oriental Yuhong. The construction process should strictly adhere to standard procedures. For example, the base layer should be dry, clean, and flat; material ratios should follow the instructions; the construction environment temperature should be controlled between 5-35℃; and a closed-water test should be conducted after completion to ensure no leakage before acceptance. Standardized construction can maximize waterproofing effectiveness and extend service life.