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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: soil pipe offset

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  1.  
    • CommentAuthormitchino
    • CommentTimeJul 9th 2020
     
    I 'm not getting any help on the UK plumbers forum so thought I'd ask here...

    I want to move a toilet further into a bathroom so I can construct a box behind it to support shelf.

    At the moment the toilet discharges into a horizontal soil pipe which runs along the wall and connects into the main stack.

    I was thinking I could put 2 x 135 degree offsets in the horizontal run so that the toilet can sit further out from the wall.

    Will this be ok, not against regs etc?

    Found this pic online which is similar to current layout.
      extending-soil-pipe.jpg
    • CommentAuthorphiledge
    • CommentTimeJul 9th 2020
     
    Ive no idea if theres any restrictions in the regs but first thing to try, if theres space between the joists, would be to turn the T piece in the stack so you can have a straight pipe coming out from the stack at a slight angle.

    Failing that put the set in as you suggest but make sure the pipework is fully supported both sides of the set so you dont get any sagging. Make sure theres a continuous fall from pan to stack as near to 1:40 as you can get.

    Put the set close to the pan so if things do go wrong you can lift the pan and get your hand in;)
  3.  
    I agree swiveling the T-piece is the obvious solution, but it depends how far you out you need to move the WC. If the joist is as pictured you'd get about 6" movement at most.
    If there isn't a joint you could swivel you could insert a flexible connector to achieve a very small angular movement, without the need for a double change of direction.

    Incidentally I don't think the pipes in the picture running in cut-outs in the top of the joists is good is it? Structurally weak, and at risk of nails?
    • CommentAuthormitchino
    • CommentTimeJul 9th 2020
     
    The picture is nothing to do with my bathroom, just a random pic from the web. My problem with twisting the T piece is it already has another pipe connected to it from the sink running along the other wall, so I can't turn it.
    • CommentAuthortony
    • CommentTimeJul 9th 2020
     
    Bends are ok , best not horizontal min fall 1:40
    • CommentAuthormitchino
    • CommentTimeJul 9th 2020
     
    thanks all
    • CommentAuthorCWatters
    • CommentTimeJul 9th 2020 edited
     
    <blockquote> I was thinking I could put 2 x 135 degree offsets in the horizontal run so that the toilet can sit further out from the wall. </blockquote>

    Might get away with a single one of these and a short length of pipe and blanking plug/rodding access.

    https://www.polypipe.com/housing/below-ground-drainage/soil/system-2000-soil-vent-pvcu/single-branch-4in110mm-135%C2%B0-triple-socket-swt37sg

    As per the attachment. The "straight on" part can be used to provide rodding access.
      Branch.jpg
    • CommentAuthorSteveZ
    • CommentTimeJul 12th 2020
     
    How about one 135 degree bend plus a 90 bend at the correct point near the pan to bring it to the pan spigot. If that doesn't appeal, how about a nice long flexible connector on the pan end of the existing pipe run. You can get them to extend up to 540mm. I found one very useful on my last bathroom rearrangement. Screwfix or eBay should provide the necessary.
    • CommentAuthortony
    • CommentTimeJul 12th 2020
     
    Flexi pan connector?

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