Tapping into SVP

Discussion in 'Plumbers' Talk' started by Stu Hub, Sep 14, 2021.

  1. Stu Hub

    Stu Hub New Member

    I am looking to put a second, downstairs toilet in my house. Its directly beneath the current toilet which has a SVP stack that runs floor to ceiling.
    Its a cast 100mm that I need to tap into - I can find strap on bosses that will allow a 40 or 50mm waste into to platic soil pipe no problem.

    How do I tap a 100mm waste into this please - any ideas gratefully rec'd
     
  2. pppmacca43

    pppmacca43 Super Member

    You would need to cut it and put a tee in
     
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  3. pppmacca43

    pppmacca43 Super Member

    You can get mcalpine bosses for 32/40mm suitable for cast iron but as far as I’m aware the only way to get a 110mm waste branch is to cut a tee in. This can be done in more than one way but I would suggest a mcalpine drain connector into the cast with a 110mm tee in and a piece of pipe out of the top with a slip jubilee coupler as there won’t be any movement in the pipe. Obviously the weight of the cast above is going to be very heavy so u need to make sure this isn’t going to drop when you cut a section out. Cast can be a pig to cut also.
     

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  4. Stu Hub

    Stu Hub New Member

    Wow!! How very different a response to certain social media platforms!! Thank you - I have located a flexible equal Tee that will do the job, however, I hadn't taken into account the fact that the cast may drop when I cut the section out - I need to have a think about this
     
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  5. pppmacca43

    pppmacca43 Super Member

    Depending on if it’s clipped, how it’s ran above etc it may not drop but it’s definitely something to consider.
     
  6. Stu Hub

    Stu Hub New Member

    Its completely boxed in all the way through the house so I have no way of knowing if it is clipped - just been having a mooch and, as far as I can see, mine is the only house in the street with the SVP internally, all the rest have them outside - typical!!
     
  7. dcox

    dcox Screwfix Select

    Here’s one I did last week. It is a bit scary chopping through a cast iron stack and ideally I’d replace the whole thing with plastic but this was an emergency job.

    E4E8A7C7-81BB-484B-82BF-828737588010.jpeg
     
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  8. pppmacca43

    pppmacca43 Super Member

    Perfect example of what I meant DCox :)
     
  9. WillyEckerslike

    WillyEckerslike Screwfix Select

    I wish I could cut a hole that neatly with a 9" grinder..... Impressive!
     
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  10. dcox

    dcox Screwfix Select

    It’s a very versatile tool! Joking aside it was a very satisfying hole to core. I’d like to say they always look like that but I’d be lying.
     
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