Reserved Hole Position for Mobile Toilets

The reserved hole position for mobile toilets can be achieved through methods such as self-design when the ground is unfilled, using toilet offset connectors, same-floor drainage renovation, and inter-floor drainage renovation, as detailed below:

Self-design when the ground is unfilled

If the toilet drainage hole in the delivered house is a reserved pipe connection and the ground is unfilled (approximately 300 millimeters below the floor level), homeowners can design the drainage or water outlet connection positions themselves. After modification, the ground needs to be backfilled, and the floor, waterproof layer, and tiles should be laid in sequence. This method is suitable for the early stages of renovation, allowing flexible adjustment of the reserved hole position, but it is necessary to ensure that subsequent construction complies with waterproofing and drainage specifications.

Using toilet offset connectors

If the ground has been backfilled or if you do not want to make extensive modifications to the pipes, short-distance relocation (usually 5-10 centimeters, up to 15 centimeters in special cases) can be achieved by installing an offset connector. The offset connector should be installed before laying the floor tiles, and the drainage slope should meet the requirements (the greater the distance, the higher the slope requirement). Note: Offset connectors may increase the risk of blockage, and an increase in pipe bends can easily lead to sewage backflow. Therefore, it is recommended to keep the relocation distance within 10 centimeters.

Same-floor drainage renovation

• Floor lowering: If the bathroom floor is already recessed (250-350 millimeters), you can freely arrange the toilet and other drainage outlets. Using a slanted tee instead of a straight tee can reduce the risk of blockage, and it is also necessary to ensure a reasonable drainage slope.
• Floor raising: By building a raised platform (180-200 millimeters high) and re-embedding the drainage pipes, long-distance relocation can be achieved. This method involves a large amount of work and may affect the use by the elderly (e.g., requiring steps), so it should be chosen with caution.

Inter-floor drainage renovation

• Relocation from the ceiling below: This requires negotiation with the neighbors downstairs to create a new hole in the ceiling of their bathroom and connect it to the main drainage pipe. There is no limit to the relocation distance, but proper waterproofing must be done, and a trap must be installed to prevent odors.
• Wall-mounted toilet conversion: By installing a wall-mounted toilet using a steel structure, a large relocation distance can be achieved, and it is aesthetically pleasing and easy to clean. However, this method does not allow the toilet to be moved to the other side of the drainage pipe, so the pipe layout must be planned in advance.

Precautions

1. Relocation distance control: It is recommended to keep the relocation distance within 10 centimeters to reduce the risk of blockage; if exceeded, the floor level should be raised, and the use of 90-degree elbows should be avoided (two 45-degree elbows can be used instead).
2. Accurate measurement of the rough-in distance: Measure the distance from the center of the drainage hole to the wall and reserve the thickness for renovation (e.g., an additional 2-5 centimeters for wall tiles).
3. Protection of the waterproof layer: Regardless of the method used, ensure the integrity of the waterproof layer to avoid leakage caused by construction damage.