How to Design the Roof of a Container House

The design of the roof of a container house requires comprehensive consideration of structural stability, waterproofing, thermal insulation, and aesthetics. Common design methods include flat roofs, arched roofs, triangular roofs, and photovoltaic integrated roofs, with specific choices depending on the usage scenario, climatic conditions, and functional requirements.

1. Selection of Roof Structure Types

1. Flat Roof Design
   Suitable for areas with dry climates and low rainfall, it is simple to construct and has relatively low costs. Emphasis should be placed on strengthening waterproofing measures, such as using high-density polyurethane spraying or laying waterproof membranes, and setting a slope (usually ≥2%) to avoid water accumulation. For example, the Apple Pod container house adopts factory-prefabricated modular boxes, with the roof load transferred to the bottom beams through side wall columns, ensuring structural stability and facilitating the installation of photovoltaic modules.

2. Arched Roof Design
   An arc-shaped structure is constructed using steel frames or aluminum alloy brackets to enhance the roof's load-bearing capacity while improving aesthetics. Steel and aluminum alloy offer excellent strength and durability but come at a higher cost; waterproof fabrics are low-cost and easy to install but require regular replacement. The arc of the supporting structure must be precisely calculated to ensure a flat and stable roof, and additional crossbeams or steel plates should be added to the top of the container to distribute the load.

3. Triangular Roof Design
   Commonly used in tropical climates, it utilizes metal plates at the top for rain and sun protection, translucent materials in the middle to introduce natural light, and steel plate louvers at the bottom for ventilation. For example, the OostKampville project in Bangkok adopts a triangular roof design, which not only blocks strong light and rain but also promotes air circulation through the louvers, preventing heat accumulation.

2. Materials and Functional Integration

1. Thermal Insulation Materials
   Spraying high-density polyurethane insulation layers on the roof or adopting composite sandwich panel structures (such as rock wool or glass wool) can significantly improve thermal insulation performance. For example, the roof of the Apple Pod container house has a comprehensive heat transfer coefficient of ≤0.28W/㎡·K, meeting ultra-low-energy building standards and adapting to extreme low-temperature environments.

2. Photovoltaic Power Generation Integration
   Customized crystalline silicon photovoltaic modules are embedded into the roof to achieve integration of the building envelope and power generation functions. Combined with energy storage battery packs, they can meet the electricity demands of air conditioning, lighting, and other applications, even enabling off-grid operation. For example, container houses in Costa Rica achieve energy self-sufficiency through roof photovoltaic systems, supporting full-scenario electricity usage.

3. Construction and Maintenance Points

1. Waterproof Sealing Treatment
   The connection between the roof and the container must be tightly sealed. Sealant should be replaced regularly (usually every 5-7 years), and leaves should be cleared to prevent water accumulation and corrosion of the steel plate. Areas around doors and windows, as well as seams between container bodies, also require special attention.

2. Rust and Corrosion Prevention Maintenance
   The main body of the container is made of steel, so welds, corners, and other rust-prone areas must be regularly inspected, and rust should be promptly ground off and repainted. In inland dry areas, it is recommended to recoat the anti-corrosion layer every 8-12 years, while in coastal areas, recoating should be done every 3-5 years.