What is the Best Wall Thickness for Prefabricated Houses?

The choice of wall thickness for prefabricated houses should be determined based on specific usage scenarios and requirements. Common thickness specifications and their applicable scenarios are as follows:

1. 75mm Wall: Suitable for Interior Partitions
75mm-thick walls are primarily used for dividing interior spaces, such as separating the living room from the dining room or the bedroom from the study. Their advantage lies in saving interior space while achieving basic sound insulation and fire resistance through lightweight materials (such as gypsum board and light steel keels). However, it should be noted that such walls are not suitable as load-bearing structures and have relatively weak thermal insulation performance, requiring additional insulation layers to meet energy-saving requirements.

2. 90mm Wall: Suitable for Exterior Wall Insulation
90mm walls are commonly used as exterior wall insulation layers in prefabricated houses. By filling with insulation materials such as polystyrene boards and rock wool, they can effectively block heat transfer, reducing energy consumption for heating in winter and cooling in summer. Such walls are suitable for buildings in temperate climates or those with low energy efficiency requirements. However, if used in extreme climate regions, they need to be combined with other insulation measures (such as double-layer walls or externally hung insulation boards) to enhance performance.

3. 100mm Wall: Balancing Insulation and Lightweight Structural Requirements
100mm walls are a common choice for lightweight prefabricated houses. Their thickness can meet basic insulation requirements while supporting the loads of lightweight houses through reinforced structural designs (such as built-in steel bars or lightweight concrete). Such walls are suitable for low-rise residences, vacation cottages, and other scenarios. However, if used in high-rise or multi-story buildings, their wind pressure and seismic resistance need to be further evaluated.

4. 120mm Wall: Suitable for Heavy Industrial Buildings and Load-Bearing Walls
120mm walls are standard configurations for heavy industrial buildings. Their thickness provides higher structural stability and load-bearing capacity, suitable for equipment factories, warehouses, and other scenarios with high wall strength requirements. Additionally, according to building codes, the minimum thickness of load-bearing walls must be 120mm to ensure overall building safety. If cement prefabricated panel walls are used, their thickness is typically between 120mm and 150mm. However, it should be noted that their thermal insulation performance is relatively poor, requiring additional insulation layer designs.

Special Note: Limitations of Cement Prefabricated Panel Walls
Cement prefabricated panel walls, with their relatively large thickness (120-150mm), were once widely used in brick-concrete structural buildings. However, they have insufficient thermal insulation performance, limited load-bearing capacity, and poor stability, and have gradually been replaced by modern prefabricated wall technologies. If such walls need to be used, it is recommended to combine them with insulation materials and structural reinforcement measures while strictly adhering to local building codes.