Waterproofing for Rural Prefabricated Slab House Roofs

Waterproofing for rural prefabricated slab house roofs presents certain difficulties, and rain leakage is a relatively common issue that can be addressed through various methods.

The reason for rain leakage in prefabricated slab roofs lies in their inherent holes and hollow structure, which allows water to flow easily within them. Simply applying waterproofing on the surface is insufficient to completely solve the problem. Here are several ways to address rain leakage in prefabricated slab roofs:

• Color-steel roof: Made of metal sheets with an anti-rust coating, it is installed by pressing and assembling whole sheets, and basically does not leak rain. There are two installation methods: pointed-roof and flat-roof styles. Both have the same rainproof coefficient, but the cost of a pointed roof is about 20% higher than that of a flat roof. Color-steel roofs have a service life of 20 years and a basic price range of 60 - 80 yuan per square meter. This type of roof not only has excellent waterproofing performance but is also sturdy and durable, effectively resisting the erosion of natural elements such as wind and rain on the roof.
• Waterproof membrane: It is a commonly used roof waterproofing material, and its waterproofing effectiveness depends on the quality of the membrane and the technical proficiency of the construction workers. Some leakage issues are caused by the technical problems of the construction workers, and the waterproofing industry often collects construction fees after the rainy season. The price of a pure waterproof membrane is around a dozen yuan per square meter, and when combined with construction costs, it is not cheap. The service life of the membrane is generally about 15 years. Selecting a reliable-quality waterproof membrane and having it operated by professional construction workers can effectively improve the waterproofing effect.
• Plastic film covering: Cover the entire roof with a plastic film, then secure it with something or cover it with a layer of soil (or other covering materials), which can perfectly solve the rain leakage problem. However, its service life is relatively short, generally 2 - 3 years, with the advantage of being cheap, costing about 2 yuan per square meter. This method has low costs and is simple to operate, suitable for users with a limited budget and not particularly high requirements for roof waterproofing.

In addition, waterproofing for prefabricated slab roofs also faces some other issues. In rural self-built houses, the use of prefabricated slabs for roofs is common, and rain leakage is a widespread problem. The waterproofing industry cannot guarantee 100% leak-proofness. Moreover, prefabricated slabs have poor thermal insulation properties, resulting in high indoor temperatures in summer and low indoor temperatures in winter. Generally, a secondary roofing material covering is required on the floor slab to compensate for these shortcomings.