Replacement of Prefabricated Slabs in Rural Houses

Caution is required when replacing prefabricated slabs in rural houses, and it is essential to strictly adhere to regulations and make thorough preparations and supervision efforts.

I. Operational Specifications
According to the Technical Policy for Rural Housing Construction, rural housing construction should follow the principles of safety, economy, applicability, and aesthetics, and strictly enforce building standards. Replacing prefabricated slabs involves structural modifications to the house. If the original wall is a load-bearing wall, direct replacement may violate Article 44 of the Building Law, as damaging a load-bearing wall can lead to structural instability and safety accidents. Therefore, it is crucial to determine the nature of the wall before construction to ensure that its load-bearing function is not compromised.

II. Operational Recommendations

1. Commission Professional Inspection: Engage a qualified building inspection agency to inspect the walls (load-bearing/non-load-bearing) and the original floor slab (prefabricated/cast-in-place) to confirm whether slab replacement without wall removal is feasible, avoiding blind construction.
2. Select Appropriate Materials and Plans: Based on the inspection results, choose hollow prefabricated slabs that match the size and load of the original floor slab. Have a professional construction team develop a detailed installation plan, specifying the steps for removing the old slab and securing the new one, ensuring no damage to the walls.
3. Supervise Construction Safety: Supervise the entire construction process, requiring the construction team to use appropriate lifting equipment and implement support and protective measures to prevent wall or floor slab collapse and ensure personnel safety.
4. Post-Construction Inspection: After replacement, commission the inspection agency again to inspect the new slab and walls to confirm structural safety before putting the house into use.

III. Characteristics of Prefabricated Slabs
Prefabricated slabs come in solid and hollow varieties. Their advantages include reduced steel usage, faster house construction, and cost savings. Disadvantages include poor earthquake resistance (weak structural integrity of the joints), susceptibility to cracks (weak load-bearing capacity and prone to leakage), and poor sound insulation (hollow structure offers subpar sound insulation). There may also be inferior products (with poor load-bearing capacity and internal shortcuts).

IV. Cost Comparison
Using prefabricated slabs for a 100-square-meter house saves 20,000 to 40,000 yuan compared to cast-in-place floor slabs. The total cost of cast-in-place floor slabs is approximately 30,000 to 45,000 yuan, while prefabricated slabs cost only 10,000 to 20,000 yuan. The price difference mainly comes from labor costs (cast-in-place labor costs an additional 150 yuan per square meter, totaling 300 to 500 yuan more). However, the price of new prefabricated composite slabs may be higher than that of cast-in-place slabs.