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Rodding access to existing rainwater downpipe

Discussion in 'Plumbing and Central Heating' started by DukeGB, 13 Jul 2020.

  1. DukeGB

    DukeGB

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    Hi All,

    We have a blocked downpipe and any advice on how to get at it would be appreciated. Water is backing the existing cast iron downpipe and flooding out the connections half way up and around the base. I have tried jetting down from the very top (~5m up) and rodding it but with on luck, just lots of silty water disturbed and I'm reluctant to keep hammering away without better access and a better idea of what's going on.
    Looking at the angles I suspect an adjacent 68mm black plastic pipe joins up near the blockage and I would like to try rodding or push a camera down this run but there is no access. Can anyone suggest how to cut this in with something like an access saddle - if they come in such a size? I'd cut the pipe but I can't move it because it's constrained by the top gutter and the concrete it is bedded in.
    Thanks in advance for any advice.
     

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  3. sircerebus666

    sircerebus666

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    Have you used the rods to tell you where the blockage is?

    What's that plastic cover with ivy growing out of it ? Is that not a rodding point?
     
  4. DukeGB

    DukeGB

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    Hi,

    The plastic cover is a rodding point, but I don't know if they're related. I've cleaned it out but can see which way it goes. Will get the water out and have another look.
    Rods from the top of the white RWP suggest it might be below ground level but I hit both metal and compacted material when rodding. That might be the issue but at our last house some chancer ran the surface water into mud which had to be fixed. O b doubt that has happen here but I don't want to damage anything in a tricky apot to access.

    Thanks for your help. Will check later today if possible and let you know. Cheers
     
  5. CBW

    CBW

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    The black pipe looks like pvc, have you tried taking the angled elbow apart and seeing what’s happening there?
     
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  6. DukeGB

    DukeGB

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    Hi Chris,

    I'd like to but I've not been brave enough yet as they're both fixed and I'd rather not unscrew things from the wall repeatedly. That said there's probably enough flex in the pipes so I'll take a look. Cheers.
     
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  8. CBW

    CBW

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    There’s usually a bit of play (flex as you call it) in them, so just give it a try, pull the upper one first. Judging by the photos it looks like there’s plenty of play in them. ;)
     
  9. DukeGB

    DukeGB

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    Ha! Will have a play and see what happens... :)
     
  10. johnny2007

    johnny2007

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    If rodding from the plastic pipe doesn't give you results, jetwash the blocked cast iron pipe from the top.
    With a bit of luck enough water should dislodge the blockage.
    Be prepared to get wet and dirty.
     
  11. DukeGB

    DukeGB

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    Haha - thank you. I tried that yesterday and it sent a lot of fine mud out the base and sides of the cast iron pipe joints. I stopped as I'd like to know for sure I'm jetting a blockage not undermining my foundations! Will persevere in a day or so and report back. Thanks again
     
  12. DukeGB

    DukeGB

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    Thanks for all your posts. I've taken both the cast iron and now the pvc off the wall. Hoovered out lots of rubbish, then discovered a split in the pvc and started digging...
    There's still more rubbish blocking the pipe, it's clearly been going through the soil for years. I now know the black pvc and cast iron pipes join before heading away from the house and going into the vertical PVC (round cap) before heading back under the house. I still need more time to clear the branch to the PVC but at least I know that runs to the street just about ok.

    Any recommendations on DIY kit to get round a 90 degree bend to help shift the rubbish? I could jet again but I'm wary of damaging the cast iron - as other sites have suggested. Also can I try to remove scale build up myself or best get a pro in?
    Thanks again.
     

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  13. DIYnot Local

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