Using Prefabricated Panels for the Roof of a Self-Built House

There are many issues with using prefabricated panels for the roof of a self-built house. If the budget allows, it is not recommended to use them. Here is a detailed analysis:

Joints Prone to Cracking: Prefabricated panels are pre-made floor slab components that are assembled on the construction site. The joints between two prefabricated panels are weak points in the structure. Due to various factors during construction, such as loose assembly or concrete shrinkage, cracks can easily form at these joints. Once cracks appear, it not only affects the aesthetics of the roof but may also lead to rainwater leakage, further damaging the interior decoration and structure of the house.

Prominent Waterproofing Issues: Waterproofing the roof of a prefabricated panel house is challenging, and the probability of rainwater leakage is relatively high. Even if waterproofing work is carried out, it cannot guarantee 100% leak-proofness. This is because the joints between the prefabricated panels and the connections between the panels and walls are all difficult points for waterproofing. Once the waterproof layer is damaged or ages, rainwater will seep into the house, causing trouble for the occupants.

Low Earthquake Resistance: In earthquake-prone areas, prefabricated panels should never be used as the roof structure. The earthquake resistance coefficient of prefabricated panels is too low, and their overall integrity and continuity are poor. Under the action of an earthquake, they are prone to fracture, displacement, or even collapse, posing a serious threat to life and property safety.

Poor Thermal Insulation: The thermal insulation performance of prefabricated panels is not good. In summer, the indoor temperature will rise significantly, making people feel stuffy and uncomfortable; in winter, the indoor temperature will be relatively low, requiring more energy consumption for heating. To improve thermal insulation performance, a secondary roofing material usually needs to be laid on the floor slab, which undoubtedly increases construction costs and difficulty.

Poor Sound Insulation: The sound insulation performance of prefabricated panels is poor. Footsteps and conversations from the upper floor can be clearly heard on the lower floor, affecting the comfort and privacy of living.

Limited Service Life: The service life of prefabricated panels is usually only about 30 years. Over time, problems such as aging and damage will occur with the prefabricated panels, requiring regular maintenance and replacement, which increases long-term usage costs.

However, prefabricated panels are not entirely without merits. Their price is relatively low, and the construction speed is fast, with installation taking only a day or half a day. When it comes to whether to use prefabricated floor slabs for rural self-built houses, the price factor has a significant impact. But if the budget is not particularly tight, it is recommended to use a cast-in-place concrete roof, which is superior to a prefabricated panel roof in terms of overall integrity, waterproofing, and earthquake resistance.