Methods for Roofing Prefabricated Panel Houses
The methods for roofing prefabricated panel houses vary depending on the era and scenario, mainly including early methods, current rural self-built house methods, and reinforcement methods.
The early method was common in rural self-built houses in the 1980s and 1990s. During production, a hollow mold was first made using wooden planks. Steel bars were then placed in the hollow part of the mold, and the hollow part was filled with cement. After the cement dried, the wooden planks were knocked off, resulting in prefabricated panels. During construction, the prefabricated panels were simply placed on the walls. However, this method had many drawbacks. Its thermal insulation performance was poor, making the house cold in winter and hot in summer. Over time, it was prone to cracking and water leakage. Moreover, its overall integrity was poor. The panels were just simply placed on the load-bearing walls without effective connections. In the event of violent shaking such as an earthquake, the prefabricated panels might shift or even fall off, posing a significant safety hazard.
There have been significant improvements in the choice of roofing materials for rural self-built houses today. A 12-centimeter-thick Hairong light steel thermal insulation roof panel is often used. During construction, scaffolding is used for support below. This method can effectively improve the thermal insulation performance of the house and provide a more comfortable living environment for occupants.
For the unstable roofs of old prefabricated panel houses, a reinforcement method can be adopted. Specifically, a layer of reinforced concrete "composite layer" is poured on top of the prefabricated panels. Before construction, the floating dust on the surface of the prefabricated panels should be cleaned to ensure a clean and tidy surface, providing a good foundation for subsequent construction. Then, a steel bar mesh with a diameter of 6 millimeters is laid, with a spacing of 20 centimeters square. The steel bar mesh serves as a connecting element to enhance the overall integrity of the roof. Next, fine aggregate concrete with a grade not lower than C25 is poured, with a thickness usually controlled between 5 and 8 centimeters. Through the connection of the steel bar mesh and the adhesion of the concrete, the originally independent prefabricated panels are "welded" into a whole, thereby improving the overall stiffness of the roof and enhancing the stability and safety of the house.
