Indoor Drainage of Container Houses

Indoor drainage of container houses needs to achieve efficient drainage by reasonably designing the drainage system, optimizing pipeline layout, and strengthening waterproof measures in combination with structural characteristics and functional requirements.

1. Drainage System Design

The drainage system of container houses should be selected as either internal or external drainage based on the usage scenario.

• Internal Drainage System: Suitable for cold regions, large-span roofs, or scenarios with high architectural facade requirements. The system consists of a rainwater head, connecting pipes, suspended pipes, risers, discharge pipes, buried pipes, and inspection wells. The rainwater head collects roof rainwater and intercepts debris, which is then introduced into the suspended pipes through the connecting pipes and discharged to the outdoor inspection wells via the risers and discharge pipes. For example, the Apple Pod container homestay adopts a curved design to optimize drainage performance, allowing rainwater to naturally flow to the drainage outlets along the roof and reducing the risk of water accumulation.
• External Drainage System: Suitable for regions with a mild climate and small roof spans. Through roof slope design, rainwater flows along metal or PVC drainage channels to ground drainage outlets. Attention should be paid to the sealing at the connection between the drainage channels and the roof to prevent leakage.

2. Pipeline Layout Optimization

The internal space of container houses is limited, so pipeline layout needs to balance functionality and aesthetics.

• Domestic Sewage Drainage: Sewage generated by sanitary fixtures (such as washbasins and shower rooms) is collected by horizontal branches and then directed to risers, ultimately being discharged into the municipal sewer network or septic tanks. It is recommended to use UPVC or PPR pipes, which are corrosion-resistant and easy to install.
• Rainwater Drainage: If internal drainage is adopted, risers should be placed near the corners of the container to minimize the occupation of indoor space; for external drainage, drainage channels can be hiddenly installed along the eaves to maintain a neat appearance.
• Vent Pipe Installation: The drainage pipeline system should be equipped with vent pipes to balance air pressure, prevent siphonage, and avoid sewage backflow or odor regurgitation.

3. Waterproof and Anti-Seepage Measures

Waterproofing of container houses is a crucial supplement to the drainage system.

• Roof Waterproofing: High-density insulation materials (such as rock wool) combined with a damp-proof layer are used to form a multi-layer protective system. Designs like the Apple Pod reduce temperature differences through reflective coatings and ventilation layers, minimizing condensation.
• Wall Anti-Seepage: The joints of welded containers should be painted with waterproof coatings, and the nodes of bolt-connected modular containers should be sealed with sealant to prevent rainwater infiltration.
• Floor Treatment: Concrete strip foundations or prefabricated pads should be laid at the contact surface between the container's bottom beam and the ground to ensure uniform force distribution and prevent door and window deformation or wall cracks caused by settlement.