Capping sewer pipe before concreting

**brettsyoung** · 19th February 2008, 03:35 PM

Hi all. About to demolish an outhouse-washroom that's about 5 metres from the back of the house. I will close off the water pipes and remove all the toilet/taps/basins etc but I'm not sure how I should block off the waste drain. The pipe runs from the outhouse about 10 metres parallel to the house before joining the main house-sewer. I want eventually to build a garage over the site and the remaining pipes will be under the concrete (not the water supply pipes which will be cut-off next to the house). Can I just cap the pipe (100mm PVC) and bury in concrete? (and will the concreter have an issue with this.) I don't really want to dig a 10 metre trench to get the entire thing out or dig down one metre to cap the pipe where it joins the main sewer unless I have to (ie it's strongly recommended that I should).

Cheers
Brett

**Skew ChiDAMN!!** · 19th February 2008, 06:00 PM

Originally Posted by brettsyoung

I don't really want to [...] dig down one metre to cap the pipe where it joins the main sewer unless I have to (ie it's strongly recommended that I should).

This would be my (strong) recommendation.

Then you can leave the pipe underground without worrying too much about it - and if your concreter has an issue with it he can dig it up himself without going through the "you need a plumber" argument.

**dan76** · 19th February 2008, 07:08 PM

put a crapper in the shed

**wonderplumb** · 19th February 2008, 07:38 PM

in good practice you should always cap off a branch drain on the junction to the main drain.
What is the drainage made of??

**brettsyoung** · 20th February 2008, 06:55 AM

Thanks for the replies. I'll cap it off at the main (it's PVC by the way) if I decide to remove the plumbing altogether. But "put a crapper in the shed" has me thinking - dunno why I didn't think of that before - I think I might leave the plumbing in a good enough state until just before the pour in case I decide to take up this option. I guess I could stick a shower in there too....

thanks again. Brett

**wonderplumb** · 20th February 2008, 10:43 AM

You could stick what ever you like in ther mate, if you do cap it off use a 4" socket with a screwed lid.

**bricks** · 21st February 2008, 07:17 PM

What I would do is buy a 100mm socket , put that on the pipe riser below floor level.

Then buy a 150mm Bolt and trap screw, Give this to the concretor to set up flush with floor level., Basically it goes over the pipe so you can use it later without having to have the pipe sticking up out of your shed floor.

**brettsyoung** · 26th February 2008, 12:01 PM

Helpful replies all. In light of the above discussion I might save the water and drain pipes and seal off for a future toilet. Thanks heaps. This forum is saving me a lot of headaches.

cheers
Brett

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