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

Prefabricated panels can be used on the roof of a self-built house, but their drawbacks must be carefully considered and appropriate measures taken.

Drawbacks of Prefabricated Panel Roofs

1. Joints Prone to Cracking: Prefabricated panels are manufactured in advance, and there are joints between two panels. During the use of the house, factors such as temperature changes and house settlement can easily cause these joints to crack, affecting the integrity and stability of the roof.
2. Prominent Waterproofing Issues: When waterproofing a prefabricated panel roof, there is a relatively high probability of rain leakage. Data shows that among 10 users with prefabricated panel roofs, about 8 may experience rain leakage. Even with waterproofing treatment, it cannot be guaranteed to be 100% leak-proof. This is because the splicing method and material properties of prefabricated panels make it difficult for the waterproof layer to be completely sealed, allowing rainwater to easily seep in through the gaps.
3. Poor Earthquake Resistance: Prefabricated panels have a relatively low seismic coefficient and should not be used in earthquake-prone areas. During an earthquake, the prefabricated panel roof is prone to separating from the walls due to vibration, causing collapse and posing a serious threat to the safety of people and property inside the house.
4. Inadequate Thermal Insulation: The thickness of prefabricated panels is generally around 12 centimeters, resulting in poor thermal insulation performance. In summer, the indoor temperature will rise significantly, making people feel stuffy and unbearable; in winter, the indoor temperature will be relatively low, and additional thermal insulation measures are required. Usually, a secondary roofing material needs to be laid on the floor slab to make up for this drawback.
5. Poor Integrity: Prefabricated panels are manufactured in advance and placed on the roof, not forming an integral whole with the walls. They cannot provide tensile and stabilizing effects. In the event of a geological disaster or foundation settlement, cracks are likely to form between the roof and the walls, leading to rain leakage and other issues, and may even trigger more serious safety accidents.

Precautions for Using Prefabricated Panels

If prefabricated panels are to be used on the roof of a self-built house, factors such as the location of the house and the usage scenario should be fully considered. During installation, the flatness must be strictly controlled, and waterproofing treatment should be carried out at joints (such as panel seams). For high-altitude operations (installation or subsequent maintenance), safety protection measures should be implemented in accordance with construction safety regulations. If budget allows, it is recommended to use a cast-in-place concrete roof, which is superior to a prefabricated panel roof in terms of integrity, waterproofing, and earthquake resistance.