Are Toilets and Floor Drains Connected to the Same Pipe

Can the drainage pipes in a sunken bathroom be modified as needed? Are the toilet and the floor drain in the bathroom part of the same pipe? Let's briefly introduce this.

Are the toilet and floor drain in the bathroom part of the same pipe?

They are part of the same drainage pipe, but the toilet and floor drain pipes cannot be directly connected. The drainage pipes for the toilet and the floor drain are different branches of the same drainage pipe. Generally, the drainage pipe for the toilet has a diameter of 110 mm, while the drainage pipe for the floor drain is usually 50 or 75 mm. After the wastewater from the toilet and floor drain enters the same drainage pipe, it then flows into the main drainage pipe.

What should be noted during the installation of bathroom drainage pipes?

1. When installing the bathroom drainage pipes, it is essential to plan the position of the drainage pipes based on the location of the sanitary fixtures. During installation, choose the appropriate specifications for the drainage pipes. For example, use a 110 mm pipe for the toilet and typically a 75 mm pipe for the floor drain. If the pipe's specifications are too small, it may affect drainage performance.

2. While laying out the drainage system, do not make holes in the toilet drainage pipe to facilitate secondary drainage. Although this method may seem convenient, it can lead to unpleasant odors during later use. The toilet drainage pipe and other drainage pipes, such as the floor drain, should be kept at least 50 cm apart; otherwise, odors may arise from the floor drain.

3. When installing floor drains and sink drainage pipes, a trap (water seal) should be installed to prevent odors from rising through the pipes. When connecting and securing the drainage pipes, minimize the use of 90-degree elbows. Instead of a single 90-degree elbow, use two 45-degree elbows to improve drainage effectiveness. The installation of drainage pipes should maintain a certain slope, ideally greater than 5%, to facilitate the discharge of wastewater.

In summary：this is a brief introduction about whether the toilet and floor drain in the bathroom are part of the same pipe. We hope that this article provides you with reference and assistance. For more related information, please continue to follow our website.