Can Toilet and Floor Drain Share the Same Pipe?

Some homeowners wish to install two floor drains in their bathrooms during renovations, but due to insufficient drainage outlet reservations, they consider connecting the toilet and the floor drain to a single pipe. Is it feasible for the toilet and the floor drain to share one drainage pipe?

Can the toilet and floor drain share a pipe?

No, it is not permissible. According to building drainage regulations and related standards, indoor wastewater and sewage should be separated. This means that the wastewater from the toilet and the drainage from the floor drain should be discharged separately. If the floor drain and the toilet share a sewage pipe, there is a high risk that the drainage volume from the floor drain could overwhelm the sewage system. If the floor drain is not properly designed or installed, it can lead to unpleasant odors. Additionally, if the toilet becomes clogged, there is a possibility of backflow from the floor drain.

What details should be noted during bathroom renovations?

1. Bathrooms are usually small spaces with high humidity, so it’s important to pay attention to ventilation and lighting. For instance, we can enhance ventilation by installing exhaust fans. Besides a main light fixture, we can also add auxiliary light sources such as mirror lights. If the bathroom is a windowless space (a "dark bathroom"), we should design a window if conditions allow.

2. Proper waterproofing and drainage are crucial during bathroom renovations. When renovating the bathroom, it's essential to reinforce the waterproofing at pipe joint areas. When laying tiles, they should be slightly sloped toward the floor drain to facilitate drainage. Additionally, it’s important to check for any sediment blockages in the drainage pipe before renovations.

3. Although the bathroom is small, it contains many sanitary ware items. Therefore, we should plan accordingly during renovations to avoid overcrowding, which can affect comfort during use. For example, we can determine the dimensions of the sanitary ware based on the bathroom's area and utilize wall space for storage.

In summary：I have briefly introduced whether the toilet and floor drain can share a pipe. I hope this article provides reference and help for everyone when renovating their bathrooms. If you would like to learn more about related information, please continue to follow our website.