Prefabricated and Cast-in-Place Slabs for Houses

There are significant differences between prefabricated and cast-in-place slabs for houses in terms of construction methods, performance, applicable scenarios, and costs.

Construction Methods: Prefabricated slabs are manufactured in factories in advance, transported to the construction site, and directly assembled, resulting in a short construction period. For example, a 5,000-square-meter project can be completed in just 7 days, with single-story construction taking only 2 days. In contrast, cast-in-place slabs require the entire process of formwork erection, steel bar tying, concrete pouring, and curing to be completed on-site. Just the concrete curing process takes more than 28 days, making the construction period approximately 2.3 times longer than that of prefabricated slabs. The specific process includes steps such as setting out and positioning, drilling and inserting steel bars, concrete pouring, and curing and formwork removal.

Performance Comparison:

1. Earthquake Resistance: Cast-in-place slabs form a continuous structure through integral pouring, offering excellent earthquake resistance. Cracks are dispersed during earthquakes, and repair costs are low. Prefabricated slabs, however, are prone to overall collapse due to weak connections at the joints.
2. Waterproofing: Cast-in-place slabs have no joints, making them suitable for areas with high structural waterproofing requirements, such as sloped roofs, flat roofs, and bathrooms. Prefabricated slabs, with their holes and joints, are prone to leakage over long-term use.
3. Other Performances: Cast-in-place slabs have strong integrity, high load-bearing capacity, and significant thermal and sound insulation effects. Prefabricated slabs perform relatively poorly in these aspects.

Applicable Scenarios: Due to their performance advantages, cast-in-place slabs are widely used in high-rise residential buildings, large-span spaces, and areas with high waterproofing and earthquake resistance requirements, such as bathrooms and kitchens. Prefabricated slabs are suitable for rural self-built houses, temporary buildings, or projects with tight budgets and schedules. However, strict joint waterproofing treatment is required, and they should be avoided in critical load-bearing parts.

Cost Differences: Prefabricated slabs save approximately 30% on material and labor costs compared to cast-in-place slabs, making them suitable for projects with limited budgets. Although cast-in-place slabs have higher costs, their stable performance and low maintenance costs over long-term use result in better overall cost-effectiveness.

In conclusion, the choice between prefabricated and cast-in-place slabs should be based on a comprehensive consideration of construction period, budget, performance requirements, and applicable scenarios to ensure structural safety and functional suitability.