How to Arrange Drainage for Container Houses

Drainage for container houses is primarily arranged through same-floor drainage, ground-floor drainage, and second-floor drainage methods, and can also be facilitated by setting up drainage outlets or sewage tanks.

Drainage System (Sewage and Wastewater) Layout

• Same-Floor Drainage as the Primary Method: This is the most commonly used and efficient method for container houses. The drainage branches of ground-floor sanitary fixtures (toilets, floor drains, washbasins, kitchen sinks) converge under the finished floor (floor surface) into a horizontal main drainage pipe. The pipe maintains a certain slope (usually ≥2%) and ultimately connects to the main drainage riser located at the bottom of the container or directly discharges into a preset outdoor septic tank/municipal sewer interface.
• Second-Floor Drainage: The drainage branches of second-floor sanitary fixtures also converge under the floor of that floor. The main drainage pipes on the second floor, both horizontal and vertical, are typically arranged in the ceiling space corresponding to the ground floor (i.e., "inter-floor drainage"). In this way, the sewage from the second floor is discharged through the pipes "passing through" the ceiling space of the ground floor, avoiding the appearance of obvious descending pipes on the second-floor floor or walls, and maintaining a tidy space. The drainage risers ultimately converge or are separately led out on the ground floor.
• Pipe Material and Slope: Drainage pipes mainly use PVC-U pipes, which are tightly connected and corrosion-resistant. Ensuring sufficient slope is crucial for smooth drainage. The design should be precisely calculated, and the construction should strictly follow the slope.
• Ventilation System: The top end of each main drainage riser must extend above the roof or high on the side wall and be equipped with a vent cap to balance the air pressure inside the pipes, preventing the destruction of water seals, which can cause odors and poor drainage.
• Water Seals and Odor Prevention: Each drainage fixture (floor drain, washbasin, sink) must be equipped with a trap (P-type or S-type) below it, utilizing standing water to form a water seal, effectively isolating sewer odors and pests.

Other Drainage Methods

• Set up drainage outlets or drainage channels on the floor of the container house to discharge domestic sewage and rainwater and other wastewater into a sewage tank outside the container or the municipal sewer network.
• If the container house is equipped with facilities such as a restroom or bathroom inside, a sewage tank or drainage pipes can be set up inside the container house to store the sewage in the sewage tank or directly discharge it into a sewage tank outside the house.