Relocation of Toilet Floor Drain

Relocating the toilet floor drain requires careful construction, involving a comprehensive assessment of conditions, standardized procedures, and prevention of after-effects. Here are the specific key points:

I. Inspection Before Relocation

1. Assessment of Drainage Conditions: For old houses (e.g., those with cast-iron drainage systems built before the 1990s), the relocation distance should be ≤30cm. For new houses (with PVC drainage systems), the maximum relocation distance can be up to 1m.
2. Confirmation of Main Pipe Position: Avoid the joints of the main pipe and do not relocate the drain in the direction of the reverse slope, as this can easily lead to poor drainage or backflow.
3. Space for Floor Elevation: Relocating the drain requires laying pipes, so the floor must be elevated by at least 3cm; the requirement can be relaxed for sunken bathrooms.

II. Standard Construction Procedures

1. Pipe Selection: For relocation distances ≤30cm, use national standard 50mm pipes; for distances >30cm, use 75mm pipes with a wall thickness ≥3mm.
2. Slope Control: Construct with a slope of 3‰-5‰, meaning the pipe should be elevated by 3-5mm per meter to ensure smooth drainage.
3. Joint Sealing: After sealing with rubber rings, apply waterproof glue and wrap two layers of waterproof tape to prevent leakage.
4. Acceptance Testing: Conduct a water filling test to observe the drainage speed (1 liter of water should drain within 10 seconds) and check for joint leakage; in northern regions during winter, wrap insulation cotton to prevent condensation.

III. Relocation Scenarios and Precautions

1. Scenario Adaptation:
   • Relocate to a corner when there is a positional conflict (e.g., the floor drain is blocked by the toilet) or when it affects usability.
   • Adjust between dry and wet areas: relocate the floor drain into the wet area if there is none, or move it to a corner if the floor drain in the shower area is far from the wall.
2. Key Restrictions:
   • The relocated pipe must be laid close to the floor, with a typical diameter of 40mm; cutting the elbow to align with the floor will make it impossible to install an S-trap for odor prevention, so prioritize selecting a drainage outlet with an S-trap in its original position.
   • A 40mm diameter pipe must use a dedicated floor drain to avoid leakage due to size mismatch.
   • If the original drainage outlet has no S-trap, the risk of odor after relocation is high; avoid relocation unless necessary, or mitigate the odor with an odor-proof core or a deep-water-seal floor drain.

IV. Selection and Maintenance of Floor Drains

1. Quality First: Choose mid-to-high-end products priced above 200 yuan, which offer better odor prevention, drainage, and durability.
2. Functional Adaptation: Use deep-water-seal (water seal ≥5cm) or gravity magnetic floor drains in the shower area; use mechanical odor-proof floor drains in dry areas.
3. Regular Maintenance: Clean the filter screen monthly and unclog the pipe with hot water or a mixture of baking soda and white vinegar every quarter.

V. Prevention of After-Effects

1. Before Construction: Confirm the S-trap of the original drainage outlet, assess the necessity of relocation; prioritize short pipes and positions close to the wall.
2. During Construction: Ensure the elbow is flat to avoid water accumulation due to tilting.
3. After Construction: Test the drainage speed and observe for odor; if odor occurs, install an odor-proof core or replace the floor drain; if drainage is poor, check the slope or unclog the pipe.