Container House Roof Drainage

The roof drainage of container houses mainly adopts an organized drainage method, with common types including internal drainage, eaves-trough external drainage, and gutter external drainage. The specific design needs to be optimized in combination with the structural characteristics and usage scenarios of container houses.

1. Internal Drainage System

The internal drainage of container houses collects rainwater through drainage troughs around the roof and channels it into downspouts inside the columns, ultimately introducing it into the ground or drainage system. For example, box-type movable packing container houses use an internal drainage structure, with drainage troughs installed on the top and four downspouts installed inside the columns to prevent rainwater from directly contacting the exterior walls and reduce the risk of leakage. Internal drainage is suitable for cold or rainy regions as it can prevent pipe freezing and blockage. However, the pipes need to be cleaned regularly to prevent blockage, and the construction cost is relatively high.

2. Eaves-trough External Drainage

Eaves-trough external drainage collects rainwater by installing U-shaped eaves-troughs at the edges of the container house eaves and then discharging it to the ground through downspouts. Its advantages are relatively simple installation and maintenance, organized drainage, and protection of the walls. The disadvantages are that the eaves-troughs are easily blocked by debris such as fallen leaves and need to be cleaned regularly. In cold regions, drainage may be impeded due to freezing. This method is suitable for general civil buildings in regions with moderate rainfall, such as residential houses and small office buildings.

3. Gutter External Drainage

Gutter external drainage collects rainwater through longitudinal gutters on the roof and then discharges it to the ground or underground system through drainage pipes. Its advantage lies in its suitability for large-span roofs, high drainage efficiency, and centralized discharge of rainwater. However, the gutter design is complex, the construction cost is high, and proper anti-leakage treatment is required. This method is commonly seen in large industrial plants and public buildings (such as stadiums and shopping malls).

4. Optimization Points for Container House Drainage

1. Material Selection: The roof drainage troughs can be made of materials such as stainless steel, PVC, or galvanized steel sheets, which need to have corrosion resistance and aging resistance. For example, 304 stainless steel gutters are suitable for long-term outdoor exposure, while PVC gutters have a lower cost and are suitable for scenarios with a limited budget.
2. Slope Design: The gutters or eaves-troughs need to maintain a certain slope (usually not less than 1%) to ensure rapid drainage of rainwater and avoid water accumulation. For example, if the horizontal slope of the gutter of a movable house is insufficient or the outlet design is unreasonable, water accumulation and backflow may occur during heavy rain.
3. Sealing Treatment: The joints on the roof need to be sealed with structural adhesive, and the moisture-proof film needs to be firmly pasted to prevent rainwater leakage. For example, if the structural adhesive at the joint of the iron sheet layer on the top of a box-type house is not applied properly or the moisture-proof film is not pasted well, leakage will occur.
4. Regular Maintenance: It is necessary to regularly clean debris from the drainage troughs and downspouts and check whether the sealing materials are aging to ensure the smooth operation of the drainage system.