Is a shallow sewer line grandfathered in for a remodel in Ca.?

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Jamavo

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Hello, new to the forum. Have gone through the permitting process and have started demo on a 38' by 34' RV garage in the back yard to convert to an ADU with a kitchen and relocated bath room, built and permitted with the house in 1983. Had the plumber come out yesterday for the new plumbing for a kitchen sink and bathroom vanity. Discovered that the sewer line running through the center of the building is only 1" inch or so beneath the cement slab in the back of the building, and about 14" below in the front (They installed clean outs on both sides). The plumber mentioned that the current code is 18" and deeper, and that he wanted to consult with some of his colleagues. My question is, will this existing shallow sewer line be grandfathered in, or should I plan to start tearing up some cement. The whole back yard is concrete the whole length of the line.

Thanks for your answers and any advice is welcomed.

Jason
 

breplum

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There is no uniform code that has any problem whatsoever with sewer pipes under a slab, NONE.
Most of Calif uses the CPC which is derived from the UPC.
The codes do pertain to pipes outside the buildings, nothing about under slabs.
Unless you live someplace where cold weather affects the ground in freezing conditions, then that would be/might be a local code.
 
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