J
My semi-d uses a single stack system, which I believe is quite common. All the waste pipes from upstairs flow into a single pipe at the side of the house. The pipes from the upstairs toilets enter the stack pipe above those from the sinks, etc, and the top of the stack pipe has a vent, presumably to draw up and disperse any nasty smells. This system is separate from the groundwater/gutter waste system.My concern is that the pipe feeding the drain with sewage from the toilets is also feeding the drain with waste water from the bathroom sink, bath, ensuite sink, and shower. The proposed solution by the builder will leave this set up intact and will result in the waste water running directly into the sewage pipes.
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