Waterproofing for Rural Prefabricated Slab Houses

Waterproofing for rural prefabricated slab houses requires a comprehensive approach. Simply applying waterproofing at the bottom is ineffective; it must be addressed from two aspects: overall roof waterproofing and treatment of key areas.

Overall Roof Waterproofing

Waterproofing the roof of rural prefabricated slab houses is challenging, with a high probability of leaks. Eight out of ten such houses experience leaks, and the waterproofing industry cannot guarantee 100% leak-proof results. This is because prefabricated slab roofs are prone to water seepage issues, and waterproofing only at the bottom does not solve the fundamental problem. For roof prefabricated slabs that cannot be trenched to block water, an overall waterproofing solution is necessary for effective waterproofing. Waterproofing membranes can be laid on the roof or waterproofing coatings can be applied to form a continuous waterproof layer. Waterproofing membranes should be of reliable quality and good weather resistance, such as SBS modified bitumen waterproofing membranes or polymer waterproofing membranes. During construction, ensure that the membrane laps are tight, with no hollows or lifted edges. For waterproofing coatings, options include polyurethane waterproofing coatings or acrylic waterproofing coatings. When applying, ensure uniformity and a thickness that meets requirements, generally not less than 1.5 millimeters. After the waterproof layer is constructed, a closed water test must be conducted to verify the waterproofing effect. The closed water test should last for no less than 24 hours, observing the roof for any signs of leakage. If leakage is found, prompt repairs must be made until no further leaks occur.

Waterproofing Treatment for Key Areas

Different parts of rural houses require different waterproofing methods and must be treated accordingly. When dealing with moisture rising and seepage from the ground, a waterproofing mortar or waterproofing coating stop band should be applied at the base of the wall and floor to prevent moisture from rising. For water seepage at the base of walls, a散水 (a sloped surface to divert water) can be constructed outdoors to guide rainwater away from the wall. The perimeters of window sills and door frames should be sealed with waterproofing mortar to prevent rainwater from seeping into the interior through gaps. For bathrooms, the waterproofing membrane should extend up the wall by at least one meter to ensure the walls remain dry. At the junction of balconies and wall bases, a waterproof layer must be extended at least 20 centimeters along the wall base to prevent rainwater from backing up. These key areas require meticulous waterproofing treatment to ensure no omissions, thereby effectively preventing leaks.