Why is it that only the toilet on the second floor is easy to smell

If you are a new building, now the way of building drainage is different from before, many buildings in the design of sewer pipes, are from the roof to the second floor, the first floor of the pipe alone, so there will be such a problem, if you say there is a smell, then there may be a blockage, because there is a reverse bend should not appear smelly.

I guess you've only got 2 floors! Yes, you don't have to connect the drain pipe to the outside of the roof of the third floor, just put the drain pipe outside the roof of the third floor!

Floor drain anti-odor: In the past, the floor drain had a poor structure of anti-odor. It is recommended to replace a new type of odor-proof floor drain to prevent odor from backflowing; If the floor drain is not used for a long time, it can be covered with a suitable amount of fine sand or dry soil in a convenient bag;

Gap between the sink hose and the PVC sewer pipe: Some washbasins are connected to the sewer through a section of hose. The first is to use the hose to make an anti-odor backwater bend, and the second is to wrap the joint between the hose and the sewer pipe with waterproof tape;

When placing the toilet, avoid the dislocation of the toilet drain and the sewer mouth to prevent the overflow of dirt, so as to avoid the odor from volatilizing from the gap between the toilet and the ground; After placing the toilet, seal the gap with the ground with sealant;

The gap between the exhaust fan and the flue is a position that people often overlook. In this case, a high-quality anti-odor check valve should be added to prevent odor from occurring due to wind when the exhaust fan is not in use.

For the indoor environment of the bathroom and kitchen, it is necessary to take care of it frequently, ventilate, and keep the room dry and clean. If you do all of the above, you will ensure that the indoor air is odor-free.

This needs to be checked where the smell comes from. Then cure.