Discuss waste pipes in cement (question 1) in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Jennie

Gas Engineer
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Hi all,
I've got a really tricky scenario.
The house I'm working in has had an extension added to a utility room (in itself an extension on the side of the original house). The utility room has a toilet and basin, with waste pipes running under the cement floor. The 40mm basin waste is also under the floor, after running along a wall for a while. I presume they meet up at the other side of the room, on the original soil stack which then presumably (can't see through cement) runs to he drainage pipes in the yard where there is an inspection cover.
The householder would like to put in a shower, which will need a waste run. Also, the current basin waste runs across a wall where a doorway is to be knocked out. So that needs re-routing.
I've identified three options.
1. Chase the 40mm pipes into the cement floors, but can see so many problems with this.
2. Run waste through the wall to the outside, and get a drains specialist to put in an addition drain outside at corner b on my diagram, and tee it up to the inspection cover junction. No doubt this will cost zillions.
3. Twizzle the toilet round 90 degrees, so that the soil pipe above ground can be extended, so I can run the basin and shower wastes into it. Though I'm a bit worried about getting an adequate fall from the shower waste.
I'd be very grateful for your ideas, and maybe magic solutions (as I think magic is needed here).
Jennie
diagram.jpgwastepipes.jpg
 
Hi Jennie,

To be honest, you need to get an experienced plumber in to have a look. I certainly wouldn't like to give advice without seeing the situation for myself.
 
Ask for the drawings of the extension to see the routes of the underground drainage, you might be able to connect outside. if not you could take out wc and channel concrete to wc waste for connection. as Paulus said you would need to see it to have a better idea.
 
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