Prefabricated and Cast-in-Place Rural Houses

In rural house construction, the choice between cast-in-place and prefabricated methods should be based on a comprehensive consideration of the number of floors, regional conditions, and budget. For buildings with three or more floors, earthquake-prone areas, or areas prone to settlement, cast-in-place construction is mandatory. For buildings with two or fewer floors in non-high-risk areas, the decision can be made after weighing the budget.

I. Cost Differences The cost of cast-in-place floor slabs is significantly higher than that of prefabricated slabs, with a combined increase of 30%-50% in material and labor costs. For a 100-square-meter residence, the labor cost for cast-in-place construction may reach tens of thousands to over a hundred thousand yuan, while the labor cost for prefabricated slabs is only a few thousand to over ten thousand yuan. Prefabricated slabs are inexpensive per unit (e.g., a 4.2-meter-long slab costs about 100 yuan/piece) and are easy to install, making them suitable for budget-constrained scenarios. However, if prefabricated slabs are chosen, steel mesh reinforcement should be added at the slab joints and filled with concrete to enhance overall integrity, which incurs additional costs.

II. Construction Period and Requirements Cast-in-place floor slab construction has a long cycle, involving formwork erection, steel bar binding, concrete pouring, and a curing period of at least 10 days, with a total duration 5-7 times that of prefabricated slabs. Prefabricated slabs are pre-made in advance and can be installed on-site in just 2 days to complete floor slab construction. Cast-in-place construction requires strict adherence to standards, with professional teams needed for operations. The concrete mix ratio, pouring thickness (recommended ≥10cm), and curing duration (at least 7 days of water curing) must all meet standards; otherwise, cracking or insufficient load-bearing capacity may occur. Prefabricated slab installation is relatively simple but requires proper handling of slab joints.

III. Safety Performance and Post-Maintenance Prefabricated slabs have poor overall integrity and are prone to structural damage due to joint disconnection or fracture during earthquakes, so they are prohibited in areas with an earthquake intensity of 7 degrees or higher. Cast-in-place floor slabs have good overall integrity and an earthquake resistance rating of 6-8 degrees, making them suitable for high-risk areas. In terms of post-maintenance, slab joints in prefabricated slabs are prone to water leakage and require additional waterproofing treatment. Cast-in-place floor slabs have stable waterproofing performance, a low probability of cracking, and lower maintenance costs.

IV. Selection Criteria

1. Number of Floors: For buildings with three or more floors or villa-type units, cast-in-place construction is preferred. For buildings with two or fewer floors, the decision can be made based on the budget.
2. Regional Conditions: Cast-in-place construction is mandatory in earthquake-prone areas, areas near rivers or gullies, or low-lying areas prone to settlement.
3. Budget: If the total construction cost is ample, choose cast-in-place construction. If the budget is limited, qualified prefabricated slabs can be selected, and slab joint treatment should be strengthened.