Are Prefabricated Slabs Good for Rural Houses?

There are many drawbacks to using prefabricated slabs in rural houses, and it is not recommended to prioritize their use.

Overall Performance

Prefabricated slabs are placed on both ends of the wall. Even with ring beams and anchoring, their overall performance is far inferior to that of cast-in-place slabs. Cast-in-place slabs are directly poured and formed on the construction site, allowing them to better integrate with structures such as walls to form a unified whole, jointly bearing loads and providing stronger structural stability. In contrast, prefabricated slabs are pre-made and have weak points at the connections, resulting in poor overall collaborative working capabilities. They are prone to problems when facing complex stress conditions.

Waterproof Performance

There are gaps between prefabricated slabs, increasing the likelihood of future cracking and water leakage. Among rural houses with prefabricated slab roofs, 8 out of 10 experience rain leakage. This is because over time, the gaps between prefabricated slabs may gradually widen due to factors such as house settlement and temperature changes, allowing rainwater to penetrate into the house and affecting the living experience and the service life of the house.

Seismic Performance

Prefabricated slabs have a low seismic coefficient and should not be used in earthquake-prone areas as they are prone to collapse. During an earthquake, a house is subjected to strong seismic forces. Due to their poor integrity and insecure connections, prefabricated slabs are likely to separate from the walls, break, or even collapse during an earthquake, posing a serious threat to the lives of the occupants.

Sound Insulation and Thermal Insulation

Prefabricated slabs have poor sound insulation, and activities on the upper floor can be clearly heard, affecting the privacy and comfort of living. At the same time, their thermal insulation is also poor. The indoor temperature is high in summer and low in winter. Generally, additional roofing materials need to be laid on the floor slab to compensate, increasing additional costs and construction procedures.

Service Life

The service life of prefabricated slabs is usually only 30 years, which is relatively short compared to structures such as cast-in-place slabs. As the service years increase, prefabricated slabs may experience problems such as aging and damage, requiring early repair or replacement.

Although prefabricated slabs have the advantages of being inexpensive and having a fast construction speed, and were widely used in rural self-built houses in the past, with installation possible in just one day or half a day. However, considering the above-mentioned many drawbacks, if financial constraints are not a major issue, it is recommended to use cast-in-place concrete roofs.