Toilet Drain Riser Relocation

In principle, it is not recommended to arbitrarily relocate the toilet drain riser (the main sewer pipe). If relocation is indeed necessary, strict conditions must be met; branch pipes (such as those for toilets, sinks, and floor drains) can be adjusted according to needs, but must comply with regulations.

I. Conditions and Risks of Main Drain Riser Relocation

1. Obtain Written Approval The main drain riser is part of the building's public drainage system. Relocation requires approval from the property management and relevant departments (such as housing and urban-rural development, planning departments), and the plan must comply with the Building Water Supply and Drainage Design Standard (GB 50015-2019). Unauthorized alterations may violate building regulations or community management rules, leading to rectification orders or fines.

2. Avoid Affecting the Drainage System After relocation, ensure smooth drainage for the entire building to prevent blockages or backflow caused by insufficient pipe slope or excessive bends. If adjacent owners are affected (e.g., leaks or odors), you will be responsible for repairs and compensation.

II. Regulations and Restrictions for Branch Pipe Alterations

1. Toilet Pipes

   • Short-Distance Adjustment: Use a pipe relocator (typically ≤15 cm in length), avoiding right-angle bends to reduce drainage resistance.
   • Complete Relocation: Requires drilling new holes and laying pipes. You must consult with the downstairs neighbor and ensure the floor structure is safe. Waterproofing must be done after construction.

2. Sink Pipes

   • Can be converted to wall-mounted drainage to save floor space, but a strainer with a filter must be installed. Regularly clean hair and other debris to prevent clogging.

3. Floor Drain Pipes

   • Relocation distance should generally be ≤30 cm, following the "30-5-2" principle:
     • Relocation distance ≤30 cm: Avoid excessive length causing poor drainage.
     • Maintain a 5% slope: Ensure smooth water flow.
     • Use a dedicated relocator with two 45-degree bends: Reduce bending resistance.

III. Professional Recommendations

Before making any alterations, consult a professional plumber or decoration company to assess the pipe layout, floor structure, and drainage needs to ensure the plan is reasonable and feasible. During construction, strictly follow regulations to avoid damaging the original waterproof layer or load-bearing structure. After completion, conduct a closed-water test to ensure no leaks.