Mark Fleming
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I'm building my own summer place with slab on grade costruction and concrete walls. The only fixture on an outside wall (concrete) is the kitchen sink, which is also on the concrete slab. It is 18 feet from the 4" horizontal main. I'm under the UPC and the local county does not allow AAVs. They suggested that I cast the vent pipe into the concrete wall, but that's easier said than done. I'm thinking of proposing an island vent, but even that is a little difficult because of tying the vent leg into the horizontal and into a stack vent. Each of the horizontal drain and vent pipes would have to be dug into the underslab material (with a pick axe), and then backfilled.
So, I was wondering if it was possible to increase the size of the kitchen drain pipe such that no vent was required and I would need to dig just one trench (I have plenty of drop between the sink and the main). What if a 2 inch drain pipe went through the slab into a 3" elbow with 3" pipe all the way to the 4" main? It seems a little crazy that it would need to be vented, but my question is, is there a pipe size that would allow just one pipe going to the main without a vent?
Mark
So, I was wondering if it was possible to increase the size of the kitchen drain pipe such that no vent was required and I would need to dig just one trench (I have plenty of drop between the sink and the main). What if a 2 inch drain pipe went through the slab into a 3" elbow with 3" pipe all the way to the 4" main? It seems a little crazy that it would need to be vented, but my question is, is there a pipe size that would allow just one pipe going to the main without a vent?
Mark