Requirements for Thickness of Prefabricated Floor Slabs in Houses

The thickness requirements for prefabricated floor slabs in houses vary depending on the type and application scenario, as detailed below:

1. Ordinary Cement Prefabricated Floor Slabs
The thickness typically ranges from 60mm to 120mm, with the specific thickness determined by the span. For example, a recommended thickness of 80mm to 100mm is suggested for a 3-meter span. Their load-bearing capacity must comply with the standard GB/T 16727-2007, with the design load for residential slabs generally being 2kN/m² to 4kN/m² (i.e., each square meter can withstand 200 to 400 kilograms). These slabs are suitable for low-rise residences, temporary buildings, and other scenarios with lower load-bearing requirements, offering low material costs and convenient construction.

2. Steel-Frame Lightweight Prefabricated Slabs
The thickness ranges from 80mm to 150mm, with some manufacturers (such as Xuzhou Yaliyuan) supporting custom thicknesses. Their core advantages lie in lightweight and high strength: with a density of approximately 690kg/m³, a compressive strength of 1.8MPa (i.e., each square meter can withstand 180 tons of pressure), and a fire-resistant temperature exceeding 2000℃. These slabs are commonly used in industrial plants, rail transit, and other scenarios with high requirements for both fire resistance and load-bearing capacity, although their costs are relatively high.

3. Steel Truss Prefabricated Floor Slabs
The thickness ranges from 100mm to 300mm, with the truss height directly affecting the span capacity (e.g., trusses with heights of 70mm to 270mm can achieve large-span designs). Their structure, optimized through trusses, can reduce steel reinforcement usage by 60% to 70%, but installation requires coordination with steel structural keels and is sensitive to ambient temperature (recommended installation temperature: -5℃ to 40℃). These slabs are suitable for large-span buildings (such as stadiums and exhibition halls), although construction complexity is high.

4. Prefabricated Floor Slabs for Special Scenarios

• Livestock Manure-Leakage Slabs: The thickness typically ranges from 50mm to 80mm, featuring a double-layer steel reinforcement design with a compressive strength requirement of ≥25MPa (e.g., the 3-meter mechanism slab from Hunan Bocheng Landscape) to meet the load requirements of livestock activities and equipment.
• Cable Well Covers: The thickness is generally 50mm, with a load-bearing grade that must meet the B125 standard (i.e., capable of withstanding a load of ≤125kN, approximately 12.5 tons) to ensure safety under vehicle rolling (e.g., the concrete covers from Baoding Yaoquan).

Design Specifications and Customization Requirements
The thickness design of prefabricated floor slabs must comply with the Code for Design of Concrete Structures (GB 50010) and industry local standards. Most manufacturers support customization based on demand, but parameters such as span, load, and usage scenario must be provided. For example, industrial buildings need to clarify the weight distribution of equipment, while residences need to consider the load from furniture and personnel activities to ensure a balance between structural safety and economy.