Waterproofing for Prefabricated Slab Houses

Waterproofing for prefabricated slab houses requires systematic treatment tailored to their structural characteristics, with core measures including base layer repair, slab joint reinforcement, comprehensive waterproofing, gutter strengthening, and standardized construction. The specific implementation points are as follows:

1. Precision Repair of Base Layer Defects
The surface of prefabricated slabs often exhibits issues such as unevenness, sanding, peeling, and fine honeycomb cracks due to material aging or construction defects. These defects can create hidden water channels, leading to the failure of the waterproofing layer. During repair, it is necessary to first remove dust, oil, and loose particles from the base layer. Polymer cement mortar should be used to fill honeycomb cracks, and the sanding area should be reinforced to ensure a flat and dense base layer, providing a stable foundation for the subsequent waterproofing layer.

2. Rigid Filling and Reinforcement of Slab Joints
Slab joints are the primary water infiltration channels in prefabricated slab houses, prone to repeated opening and closing due to temperature differentials, building settlement, and other factors. Rigid materials such as epoxy resin and polymer cement should be used to fill the slab joints, with a filling depth reaching at least two-thirds of the joint depth. A chamfer structure should be formed to enhance bonding strength. After filling, non-woven fabric should be adhered to both sides of the slab joints as a reinforcement layer to prevent material shrinkage cracking and improve resistance to displacement.

3. Comprehensive Waterproofing Protection
Traditional local joint repair methods cannot adapt to the dynamic deformation characteristics of prefabricated slabs. Therefore, national standard thickened (≥4mm) SBS modified bitumen waterproofing membranes should be used for comprehensive铺设 (laying). During membrane construction, staggered joints should be used with a joint width of no less than 10cm, and hot-melt welding should be employed to ensure sealing. For node areas such as internal and external corners and pipe roots, additional membrane layers should be added to enhance resistance to stretching and deformation.

4. Specialized Exposed Waterproofing Reinforcement for Gutters
The gutter area is constantly exposed to standing water and ultraviolet radiation, causing conventional waterproofing materials to age and crack easily. Exposed polyurethane waterproofing coatings or acrylic waterproofing coatings should be used for reinforcement, with a coating thickness of ≥1.5mm, applied in 3-4 coats to form a dense waterproofing layer. During construction, rounded corners should be set at gutter corners to avoid stress concentration and coating cracking.

5. Standardized and Precision Construction
Waterproofing materials should be selected from national standard genuine products of brands like Oriental Yuhong, ensuring performance indicators meet standards such as GB/T 23445-2009. The construction process should strictly follow the standardized procedure of 'base layer treatment → node reinforcement → large-area laying → water closure test'. Each process must pass quality inspection before proceeding to the next step, ensuring the long-term effectiveness of the waterproofing system.