House Construction: Prefabricated vs. Cast-in-Place Slabs

There are significant differences in construction methods, performance, cost, and applicable scenarios between prefabricated and cast-in-place slabs in house construction, and the choice should be made based on specific needs.

Construction Methods

Prefabricated slabs are manufactured in factories and assembled on-site. The core process involves producing standardized cement slabs in advance at the factory, transporting them to the construction site, and directly assembling them. The construction period for a single floor can be shortened to 2 days, significantly improving construction efficiency. In contrast, cast-in-place slabs require the entire process of formwork erection, steel bar tying, and concrete pouring to be completed on-site. The concrete curing period alone takes more than 28 days, and the overall construction period is approximately 2.3 times that of prefabricated slabs, imposing higher demands on construction organization.

Performance Comparison

Seismic Resistance: Cast-in-place slabs form a monolithic structure through continuous pouring, with cracks dispersing during earthquakes, resulting in low repair costs. Prefabricated slabs, due to the presence of joints, are prone to overall collapse at the joints, exhibiting weaker seismic performance.
Waterproofing: Cast-in-place slabs have no joint defects and offer excellent waterproofing performance, making them suitable for long-term water-exposed areas such as bathrooms and kitchens. Prefabricated slabs, due to reserved holes and joint gaps during the prefabrication process, are prone to leakage problems after long-term use.
Monolithic Integrity and Load-Bearing Capacity: Cast-in-place slabs, through integrated pouring of reinforced concrete, have strong structural integrity and significantly superior load-bearing capacity compared to prefabricated slabs, meeting the needs of large spans or heavy loads.
Thermal and Sound Insulation Performance: Cast-in-place slabs, due to material continuity, offer better thermal and sound insulation effects, effectively enhancing living comfort.

Cost Advantages

Prefabricated slabs have obvious advantages in material costs and labor expenses. Taking a 5,000-square-meter project as an example, using prefabricated slabs can shorten the construction period to 7 days, saving approximately 30% in overall costs, making them particularly suitable for budget-sensitive projects such as rural self-built houses and temporary warehouses. Although cast-in-place slabs have a higher unit price, their long-term maintenance costs are low, and overall cost-effectiveness needs to be evaluated in conjunction with the project cycle.

Applicable Scenarios

Cast-in-place slabs are suitable for complex structures such as high-rise buildings and curved balconies, as well as earthquake zones and areas with stringent waterproofing requirements (such as sloped roofs, flat roofs, and bathrooms). Their self-waterproofing structural characteristics reduce the need for later maintenance. Prefabricated slabs are more suitable for projects with tight schedules and limited budgets but should avoid special functional areas such as oil and water storage to prevent joint leakage from causing safety hazards.