Waterproofing for Cement Prefabricated House Roofs
Waterproofing solutions for cement prefabricated house roofs include color steel roofs, waterproof membranes, plastic film coverage, and two-component exposed cement-based waterproof coatings. Details are as follows:
Color Steel Roofs: Made of metal sheets with anti-rust coatings, installed by pressing and assembling whole pieces. This method rarely results in rain leaks. There are two installation methods: pointed roofs and flat-laid installations. Both have the same rainproof coefficient, but pointed roofs cost about 20% more than flat roofs, mainly due to the more complex fabrication and installation of the supports for the color steel sheets. Color steel roofs can last up to 20 years, with a basic price range of 60 to 80 yuan per square meter. Their advantages include excellent waterproofing and long service life, while their disadvantage is relatively high cost.
Waterproof Membranes: These are commonly used roof waterproofing materials. The effectiveness of roof waterproofing is closely related to the quality of the waterproof membranes and the technical proficiency of the installers. Some leaks are related to the installer's skills, and it is not uncommon for leaks to occur after the first rain following waterproofing work. Waterproofing professionals often collect payment only after the rainy season. The price of waterproof membranes alone is around a dozen yuan per square meter, but the total cost, including installation, is not cheap. The service life of the membranes is generally about 15 years. Their advantages include wide application, while their disadvantages are high technical requirements for installers and significant price variations due to installation factors.
Plastic Film Coverage for the Entire Roof: Covering the roof with plastic film and securing it with objects or covering it with a layer of soil (or other covering materials) can effectively solve rain leak problems. However, the service life is relatively short, typically only 2 to 3 years. The advantage is low cost, generally around 2 yuan per square meter. This solution is suitable for scenarios with low waterproofing requirements, limited budgets, and short-term use.
Two-Component Exposed Cement-Based Waterproof Coatings: Treated with one layer of fabric and four layers of coating, providing good wrapping and overall integrity. It is essential to install exhaust vents and isolation strips to ensure waterproofing effectiveness. This solution is well-suited to the structural characteristics of cement prefabricated house roofs, providing reliable waterproofing. However, specific installation requires professional operation to ensure that the exhaust vents and isolation strips are set up correctly.
