Toilet Movement Distance
The reasonable range and handling methods for toilet movement distance should be selected based on the specific distance. Different distances correspond to different solutions, with the core principle being to ensure smooth drainage and avoid damaging the building structure.
1. Movement Distance ≤ 10 cm
If the toilet movement distance is around 10 cm, it is recommended to use flat submarine offset connectors or flat PVC offset connectors. These offset connectors are thin and can be directly installed between the original drain outlet and the new position without requiring extensive modifications to the floor or pipes. Their design maintains the drainage slope over short distances by optimizing the internal flow channel structure, preventing sewage backflow or blockages. Note that these offset connectors are only suitable for short-distance adjustments; if the movement distance exceeds 10 cm, drainage issues may arise due to insufficient slope.
2. 10 cm < Movement Distance ≤ 15 cm
When the movement distance is between 50 mm (5 cm) and 150 mm (15 cm), it is essential to set a pipe slope to ensure smooth drainage. The specific standard is a 2% slope for every 10 mm of movement (i.e., a 2 cm drop per meter of pipe). For example, when moving 15 cm, the end of the pipe should be 3 cm lower than the starting point. During construction, use specialized slope measurement tools and ensure tight sealing at pipe connections to prevent leaks. If floor space is insufficient, the floor can be partially raised or the toilet installation height adjusted, but the final height difference between the floor and the threshold must comply with safety regulations (usually ≥ 1.5 cm).
3. Movement Distance > 15 cm
If the movement distance exceeds 15 cm, conventional offset connectors will not suffice, and one of the following two solutions must be adopted:
- Floor Elevation: Raise the entire bathroom floor by more than 20 cm to create space for pipe installation. This solution requires reinstalling the waterproof layer and ensuring a reasonable height difference between the elevated floor and the floor outside the bathroom to prevent tripping hazards.
- Structural Modification: This includes raising specific areas of the bathroom floor or negotiating with the downstairs neighbor to modify the drainage pipes beneath their ceiling. If modifying the downstairs pipes, a written agreement must be signed to clarify responsibility divisions, and compliance with property management regulations is required.
4. Special Cases: Movement Distance > 150 mm (15 cm)
When the movement distance exceeds 150 mm, it is advisable to directly modify the sewer pipe. Since this requires passing through the downstairs ceiling, consent must be obtained from the neighbor. During modification, use thicker pipes (usually DN110) to reduce blockage risks and ensure the slope meets standards (a 2-3 cm drop per meter). If negotiation fails, consider switching to a wall-mounted toilet, whose drainpipe runs along the wall without passing through the floor slab, but requires advance planning of water and electricity lines.
5. Absolutely Prohibited Cases
Direct relocation is strictly prohibited when the movement distance exceeds 40 cm. In such cases, forcing relocation would require drilling holes in the downstairs ceiling to modify pipes or switching to a wall-mounted toilet. The former may damage the downstairs decoration, while the latter requires replanning the bathroom layout, incurring higher costs and complex construction.
