Specification for Thickness of Prefabricated Floor Slabs in Houses

The specifications for the thickness of prefabricated floor slabs in houses vary depending on the material type, application scenario, and load-bearing requirements. During design, specific needs must be considered, and standards such as the 'Code for Design of Concrete Structures' (GB 50010) should be followed.

1. Ordinary Cement Prefabricated Floor Slabs

The thickness typically ranges from 60mm to 120mm, depending on the span. For example, a floor slab with a 3-meter span is recommended to have a thickness of 80mm to 100mm. The load-bearing capacity must comply with the 'GB/T 16727-2007' standard, with residential slabs generally designed for 2kN/m² to 4kN/m², suitable for low-rise residences, temporary buildings, and other scenarios. These slabs, primarily made of cement, are cost-effective but require increased thickness for larger spans to ensure structural stability.

2. Steel-Frame Lightweight Prefabricated Slabs

The thickness ranges from 80mm to 150mm, with some manufacturers (such as Xuzhou Yaliyuan) offering custom thicknesses. These slabs are characterized by their lightweight nature (density approximately 690kg/m³) and high strength (compressive strength up to 1.8MPa), with a fire-resistant temperature exceeding 2000℃. They are suitable for industrial plants, rail transit, and other scenarios with high fire and load-bearing requirements. The steel-frame structure enhances overall stability by distributing loads, although costs are relatively higher.

3. Steel Truss Prefabricated Floor Slabs

The thickness ranges from 100mm to 300mm, with truss heights typically ranging from 70mm to 270mm. These slabs achieve large-span designs through truss structures, reducing steel usage by 60% to 70%. However, they require coordination with steel structural keels during installation and are sensitive to ambient temperature (recommended installation temperature: -5℃ to 40℃). They are suitable for large-span buildings (such as shopping malls, stadiums) or projects with high construction efficiency requirements.

4. Prefabricated Floor Slabs for Special Scenarios

• Livestock Manure Leakage Slabs: These slabs typically have a thickness of 50mm to 80mm, featuring a double-layer steel bar design with a compressive strength of ≥25MPa, suitable for breeding farms and other scenarios requiring drainage and load-bearing.
• Cable Well Cover Slabs: These slabs generally have a thickness of 50mm and a load-bearing grade of B125 (≤125kN), meeting the covering requirements for underground facilities.

Design Specifications and Considerations

All prefabricated floor slab designs must adhere to the 'Code for Design of Concrete Structures' (GB 50010) and relevant industry and local standards to ensure structural safety. In practical engineering, thickness must be comprehensively determined based on factors such as load, span, and environmental conditions, and verified by professional institutions. Special scenarios (such as fire prevention and corrosion resistance) require additional compliance with relevant functional requirements.