Thickness of Fire-Resistant Boards for Container Houses

The commonly used thickness range of fire-resistant boards for container houses is between 8mm and 150mm. The specific thickness needs to be comprehensively determined based on the material type, fire-rating requirements, and usage scenarios.

1. Thickness Ranges of Fire-Resistant Boards Made of Different Materials

1. Rock Wool Sandwich Panels
   As a commonly used fireproof material for container houses, the thickness of rock wool sandwich panels directly affects their fireproof performance. For example, the thickness of roof panels can reach 120mm to 150mm. The density of the rock wool core material is stable at 100–120kg/m³, with a thermal conductivity of ≤0.040W/(m·K), meeting the Class A non-combustible standard. Such thickness designs aim to achieve multiple functions such as thermal insulation, sound insulation, and wind resistance, rather than simply stacking materials.

2. Magnesium Oxide Fireproof Boards
   Taking high-strength green magnesium oxide boards as an example, their thickness is usually between 8mm and 15mm. They can withstand temperatures up to 1580–1770℃ and have a fire resistance limit of up to 4 hours when used as walls. This material is reinforced with inorganic cementitious materials and glass fibers, and it has characteristics such as waterproof and moisture-proof properties (with a water absorption rate of 15%) and environmental friendliness. It is suitable for fireproof layers on the floors or walls of container houses.

3. Fire-Resistant Partitions for Cable Trenches
   Although not directly used in the main structure of container houses, the thickness range of these panels (5mm to 15mm) can provide a reference for local fireproof design. They have a fire resistance limit of up to 2 hours and are suitable for fire separation in areas with dense cables.

2. Key Factors in Thickness Selection

1. Fire-Rating Requirements
   Class A non-combustible materials (such as rock wool and magnesium oxide boards) need to meet specific thickness requirements to achieve the required fire resistance limits. For example, a 120mm-thick rock wool sandwich panel can meet a 1.5-hour fire resistance requirement, while a magnesium oxide board only needs to be 8mm thick to achieve a 4-hour fire resistance limit.

2. Usage Scenarios

   • Roof Systems: It is advisable to choose rock wool sandwich panels with a thickness of 120mm to 150mm to balance thermal insulation and fire protection.
   • Walls/Floors: Magnesium oxide boards with a thickness of 8mm to 15mm can be used to balance fireproof performance and the need for lightweight structures.
   • Local Partitions: For cable areas, fire-resistant partitions with a thickness of 5mm to 10mm can be used for fire blocking.

3. Structural Safety
   Although increasing the thickness can improve fireproof performance, it is necessary to consider the load-bearing limitations of container houses. For example, a 100mm-thick floor slab may affect pipe penetration due to insufficient space for steel bar placement, while a 120mm-thick floor slab can avoid such problems.