Lifting Prefabricated Slabs in Rural Houses

Lifting prefabricated slabs in rural houses was relatively common in the past, but it has gradually been phased out today due to numerous drawbacks. If conditions permit, it is recommended to use cast-in-place concrete for roof construction.

I. Advantages of Prefabricated Slabs

1. Low Cost: Prefabricated slabs are relatively inexpensive and can be installed quickly, with hoisting completed in a day or half a day. After the walls are built, they can be directly lifted and assembled, allowing a small team of three to five people to complete the floor construction of a single story in one or two days, saving on both material and labor costs.
2. Simple Construction Process: Prefabricated slabs are made by creating molds based on the dimensions of the house and then pouring concrete and reinforcing steel bars. The construction process is relatively straightforward and does not require highly skilled labor.

II. Disadvantages of Prefabricated Slabs

1. Poor Waterproof Performance: When waterproofing is applied, there is a high probability of leakage. Many rural houses with prefabricated slab roofs experience leakage, with 8 out of 10 houses affected, and it is difficult to guarantee 100% waterproofing.
2. Low Earthquake Resistance: They are not suitable for earthquake-prone areas as they are prone to collapse, posing significant safety risks.
3. Poor Thermal Insulation: The indoor temperature is high in summer and low in winter. Additional roofing materials are usually required to cover the floor slab, increasing costs and construction steps.
4. Poor Sound and Heat Insulation: The sound and heat insulation effects of prefabricated slab houses are poor, affecting living comfort.
5. Ground Cracking and Leakage: After a period of use, the ground made of prefabricated slabs is prone to cracking and leakage, making repairs difficult.
6. Safety Issues: The connection method of prefabricated slab houses is relatively weak, and slight shaking can cause them to fall, posing a threat to the safety of occupants.

III. Current Situation and Recommendations Today, with the passage of time and the improvement of housing standards, prefabricated slab houses are gradually being phased out. Policy trends from the Ministry of Housing and Urban-Rural Development, the accelerated pace of urban village renovations, and new safety regulations for rural self-built houses all indicate that prefabricated slab houses may face demolition or renovation. If financial constraints are not a major concern, it is recommended to use cast-in-place concrete for roof construction. Cast-in-place concrete roofs offer better waterproofing, earthquake resistance, thermal insulation, and sound insulation, providing a safer and more comfortable living environment.