How Thick Are the Prefabricated Slabs on the Ground Floor of a House

The thickness of the prefabricated slabs on the ground floor of a house needs to be determined based on specific types and design parameters, and there is no unified standard value. The common ranges are as follows:

I. Thickness of Prefabricated Wall Panels

If the "prefabricated slabs" in the user's question refer to prefabricated wall panels, their thickness needs to be discussed in different scenarios:

1. Cast-in-place wall panels: When the ground floor adopts the cast-in-place process, the thickness of the wall panels is usually 100mm to 200mm. This type of structure is formed by pouring concrete on-site to create an integral whole. The selection of thickness needs to be determined in combination with the building load, seismic requirements, and construction specifications. For example, low-rise residential buildings or light-weight buildings may use 100mm, while high-rise buildings or buildings with higher seismic grades may increase to 150mm-200mm.
2. Upper prefabricated wall panels (connected to the ground floor scenario): If both the ground floor and the upper structure use prefabricated components, the thickness of the wall panels is generally 100mm to 150mm. This type of design needs to ensure the connection strength between the upper and lower components, and the selection of thickness needs to take into account the convenience of transportation and hoisting as well as structural stability.

II. Thickness of Prefabricated Floor Slabs

If the user specifically refers to prefabricated floor slabs (not wall panels), their thickness varies depending on the type:

1. Ordinary cement prefabricated floor slabs: The thickness range is 60mm to 120mm, depending on the span. For example, for a floor slab with a span of 3m, the recommended thickness is 80mm-100mm. For every 1m increase in span, the thickness needs to be increased by 10mm-20mm accordingly to enhance the flexural capacity.
2. Steel-framed lightweight prefabricated panels: The thickness is 80mm to 150mm. These panels enhance the load-bearing capacity through built-in steel frames and are suitable for large-span or high-load scenarios, such as industrial plants and commercial buildings.
3. Steel truss prefabricated floor slabs: The thickness range is the widest, from 100mm to 300mm. With built-in steel trusses, they can significantly improve structural stiffness and are commonly used in high-rise buildings, large-span spaces, or places with high requirements for vibration control.

III. Key Considerations

1. Process differences: If the ground floor adopts the cast-in-place process, the thickness of the wall panels has no direct relation to the prefabricated slabs; if prefabricated components are used, the type of component (wall panel/floor slab) and design parameters need to be clarified.
2. Design parameters: The thickness of the prefabricated slabs needs to be determined in combination with the building function, load, span, seismic grade, and construction conditions, and needs to be verified through calculations by a professional structural engineer.
3. Specification basis: The specific thickness should comply with the requirements of the "Code for Design of Concrete Structures" (GB 50010) and local standards to ensure structural safety and durability.