Prefabricated Panels for Eaves of Self-Built Houses

When using prefabricated panels for eaves or roofs in rural self-built houses, it is essential to comprehensively evaluate their advantages and disadvantages and make cautious choices. Prefabricated panels are widely used in rural self-built houses primarily due to their low cost and fast construction speed. For example, the total cost of using prefabricated panels for a 40-50 square meter roof may be just over 800 yuan, including hoisting services. However, their drawbacks also require significant attention, as detailed below:

1. Prominent Waterproofing Issues
Prefabricated panels are prefabricated components that need to be spliced together to form an overall roof surface during installation. The gaps between panels are prone to cracking due to material shrinkage, construction errors, or foundation settlement. Rainwater can easily seep into the interior through these gaps, especially during the rainy season or continuous rainfall, making leakage more apparent. Although improvements can be made by applying waterproof coatings or laying waterproof membranes, the complexity of the spliced structure limits the long-term effectiveness of waterproofing, resulting in high maintenance costs later on.

2. Poor Earthquake Resistance
The ends of prefabricated panels are typically directly lapped onto the walls, resulting in low connection strength with the main structure and weak overall integrity. Under seismic action, the connection points between the panels and walls are prone to detachment or displacement due to horizontal forces, significantly increasing the risk of roof collapse. Therefore, the safety of prefabricated panel roofs needs to be carefully evaluated in earthquake-prone areas or regions with unstable geological conditions.

3. Insufficient Thermal Insulation
The thickness of prefabricated panels is generally 12-15 centimeters, and their material density and thermal conductivity properties result in poor thermal insulation in summer and winter. If no additional thermal insulation layer (such as polystyrene boards or rock wool boards) or secondary roofing materials (such as cinder or lime) are applied, the indoor temperature is easily affected by the external environment, necessitating the use of air conditioners or heating equipment for temperature regulation, thereby increasing energy consumption.

If the budget allows, cast-in-place concrete roofs are a better choice. Cast-in-place roofs are formed by integral pouring, creating a seamless structure that significantly outperforms prefabricated panels in terms of waterproofing, earthquake resistance, and durability, although the cost is higher (e.g., over 3000 yuan for a 40-50 square meter area). When choosing prefabricated panels, it is necessary to weigh the initial costs against long-term maintenance expenses and strictly control the quality of waterproofing construction, such as using high-performance waterproof materials, reinforcing panel joint treatments, and setting drainage slopes to reduce the risk of leakage.