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Two roots, each household shall be separated.
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The drain main is all one.
Hello, it is needed, otherwise there will be backwater in the bathroom on the first floor.
There are no clear requirements, just leave the manholes well.
There is grease in the kitchen, which is easy to stick to the pipe wall, easy to block, or the running water is not smooth. Therefore, it is better to separate the sewer pipes from the kitchen and bathroom.
Did it go out from under the ground floor? The specification stipulates that there should be an inspection port at the place where the riser turns to the horizontal pipe, and a compartment should be set up in the future!
Drainage riser You can even count 3m (18-3)*3 per floor Now the floor height of the house is generally 3 meters.