Is Prefabricated Slab Good for House Construction?

Prefabricated slabs for house construction have certain limitations and are not recommended as the first choice. Here is a detailed analysis:

1. Prominent safety issues
Prefabricated slabs have a relatively low seismic resistance coefficient and are prone to collapse risks in earthquake-prone areas. Their installation method involves overlapping them on walls, resulting in weak structural connections. Even slight shaking can cause them to detach. In contrast, cast-in-place slabs are poured as a whole on-site and form rigid connections with walls, offering significantly better seismic performance and structural safety.

2. Poor leakage resistance and thermal insulation
Due to being pieced together in blocks, prefabricated slabs are prone to forming water leakage channels at the slab joints. Approximately 80% of rural self-built houses experience rain leakage problems. Additionally, their materials have a relatively high thermal conductivity coefficient, resulting in unsatisfactory heat insulation in summer and thermal insulation in winter. Extra insulation layers or waterproof membranes are usually required to compensate for these deficiencies, increasing construction costs and complexity.

3. Insufficient integrity and durability
Cast-in-place structures are poured as a whole with reinforced concrete, ensuring tight connections between different parts of the house, strong resistance to deformation, and a service life of several decades. In contrast, prefabricated slabs are installed in blocks. Over time, under the influence of loads or temperature changes, cracks are likely to form at the slab joints, reducing the overall structural integrity and requiring more frequent maintenance.

4. Limited applicable scenarios
Prefabricated slabs were once widely used in low-rise buildings and temporary facilities in the early 20th century (such as road ditch covers and insulation layers). However, modern house construction has gradually phased out this method, opting instead for frame structures or reinforced concrete cast-in-place techniques. Currently, prefabricated slabs are only likely to be used in small auxiliary buildings (such as storage rooms) with extremely tight budgets, in non-seismic areas, and without long-term usage requirements.

Recommendation: Unless the budget is extremely tight or there are special construction conditions, cast-in-place structures should be the preferred choice. Cast-in-place slabs are significantly superior to prefabricated slabs in terms of safety, durability, overall performance, and applicability, especially suitable for multi-story residential buildings, public buildings, and earthquake-prone areas. If prefabricated slabs must be used, strict quality control during construction is essential, with enhanced waterproofing at slab joints and avoidance of use in areas with high seismic resistance requirements.