Original forum thread about installing plumbing for a basement kitchen, focused on waste water drainage solutions.
i'm going to build a kitchen in the basement. it will be used as a commercial kitchen initially to prepare fresh pasta. there is no plan to have a commode but a sink is necessary. what is the usual method used to pump the waste water up to the drainage line, which is 7' or so above the floor? how do you vent a drain like that?
Multiple users emphasized that both the sink drain and the pump system require proper venting.
A strong recommendation to check with local inspectors first to understand requirements. Advice was given to avoid using words like "commercial" or "production" when speaking with inspectors unless absolutely necessary, as it may trigger stricter codes.
A user strongly advised installing a 3" check valve in the waste line before it ties into the main household drain. This is to prevent backflow from an upstairs clog from flooding the basement. This is separate from any check valve on the pump discharge.
The original poster clarified that the "commercial kitchen" is for fresh pasta production with minimal water use and only a sink to drain. They considered a simple sump pump in a container under the sink, questioning if a vent would be needed in that setup.
