The Use of Prefabricated Panels for House Roofs

**The use of prefabricated panels for house roofs was a common practice in early 20th-century construction, but it has gradually been phased out. For rural self-built houses, if conditions permit, it is recommended to use cast-in-place concrete for the roof. **

Advantages of Prefabricated Panel Roofs

• Low Cost and Fast Construction: In rural self-built houses, the use of prefabricated panels as roofs was very common before the 2000s. This is because prefabricated panels are relatively inexpensive, effectively controlling construction costs. Moreover, their construction speed is extremely fast, with hoisting completed in just one day or half a day, significantly shortening the construction period. This is highly attractive to builders who are eager to move in or have limited construction time.

Disadvantages of Prefabricated Panel Roofs

• Joints Prone to Cracking: Prefabricated panels are concrete prefabricated components produced and processed in a prefabrication yard and then transported to the construction site for installation. There are joints between two panels, and these joints are the most prone to cracking. Once the joints crack, it not only affects the aesthetics of the roof but may also lead to a series of subsequent problems, such as water leakage.
• Prominent Waterproofing Issues: When it comes to waterproofing, prefabricated panel roofs have a relatively high probability of water leakage. Data shows that out of 10 houses with prefabricated panel roofs, 8 experience water leakage. Even in the professional waterproofing industry, a 100% guarantee against water leakage cannot be provided. This is because the structural characteristics of prefabricated panels make waterproofing treatment difficult, making it hard to achieve complete sealing.
• Poor Earthquake Resistance: Prefabricated panels should not be used in earthquake-prone areas due to their low seismic resistance coefficient. During an earthquake, prefabricated panel roofs are prone to separating from the walls, causing house collapse and posing a serious threat to the lives of occupants.
• Poor Thermal Insulation: The thermal insulation performance of prefabricated panels is poor. In summer, the indoor temperature will be very high, making people feel stuffy and uncomfortable; in winter, the indoor temperature will be relatively low, requiring additional heating measures. Generally, secondary roofing materials need to be covered on the panels to compensate for this defect, but this increases construction costs and difficulty.

Modern Alternative Solutions

Nowadays, the use of prefabricated panel roofs has been phased out in house construction, replaced by frame structures, reinforced concrete structures, etc., further improving safety and quality. For rural self-built houses, if financial conditions allow, it is recommended to use cast-in-place concrete for the roof. This type of roof has advantages such as good integrity, strong earthquake resistance, and excellent waterproofing and thermal insulation performance.