1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Condensate soakaway and feed pipe under driveway

Discussion in 'Plumbing and Central Heating' started by Careful_Bodger, 14 Apr 2017.

  1. Careful_Bodger

    Careful_Bodger

    Joined:
    11 May 2004
    Messages:
    217
    Thanks Received:
    8
    Location:
    Hampshire
    Country:
    United Kingdom
    I am trying to plan ahead a bit here, in the case of a condensing boiler when my current bermuda baxi fails, and the possibility that a new tarmac driveway gets done first. Some of my concerns apply which ever project gets done first.

    Soooo.....if I did set a condensate soakaway, it would sit under the tarmac. Pedestrian traffic would require the >500mm horizontal run just prior to the soakaway to be also under the tarmac (to avoid a trip hazard).

    My questions are....
    1) Do the limestone chippings require replenishing or are there inspection requirements that would mean an access cover is needed (e.g. by the relevant RGI)?
    2) How and where might I suitably cap the outdoor vertical condensate pipe (until needed)?
    3) Apart from digging a pit (i.e. by the groundworks people for the driveway), is the rest of this a DIYable job?
    4) Is any of this not permitted, or not a good idea for other reasons?
    5) If a soakaway is not permitted under the driveway, is there a horizontal maximum distance limit?

    Hopefully needless to say, other options are also being considered. Access to the foul drain would require complex external routing. Internal routing would involve tiled-floor bathrooms or solid-floor kitchens. A condensate pump would work but would require up-and-over pipework.

    Thoughts welcome.
     
  2. Sponsored Links
  3. Careful_Bodger

    Careful_Bodger

    Joined:
    11 May 2004
    Messages:
    217
    Thanks Received:
    8
    Location:
    Hampshire
    Country:
    United Kingdom
    Hmmm - I thought there'd be more opining on this :(
     
  4. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,210
    Thanks Received:
    3,019
    Location:
    Daventry
    Country:
    United Kingdom
    It is a bank holiday weekend - people are busy doing family stuff!

    No reason in theory why your soakaway shouldn't go under your drive, and it is DIYable, but it does need to be accessed as part of the annual boiler service to top up the limestone chippings. You also need to consider how you might prevent your drive sinking into the pit - some sort of reinforcing structure would be required.

    If at all possible, I'd be looking at extending external drainage to a suitable location or using a pump, but without being able to see the site it's hard to make and accurate judgement
     
    • Thanks Thanks x 1
  5. Maybe the intended new boiler position can be changed to allow easy removal of condense ,it really needs a site survey.
     
    Last edited by a moderator: 17 Apr 2017
  6. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,210
    Thanks Received:
    3,019
    Location:
    Daventry
    Country:
    United Kingdom
    It's a Bermuda so the location of the new boiler will almost certainly be different anyway
     
  7. Have seen several soak away's frozen in the ground with condense backed up in to the boiler. £££+'s

    Was during 2012 thou.
     
  8. Agile

    Agile

    Joined:
    26 Jun 2004
    Messages:
    63,982
    Thanks Received:
    4,583
    Location:
    London
    Country:
    United Kingdom
    Although inefficient, a Bermuda BBU will go on for almost ever!

    I would never advise a condensate soakaway under a drive for multiple reasons.

    I think you should be using a condensate pump and an up and over outlet tube. They can be quite thin and easy to fit.

    Tony
     
    • Like Like x 1
  9. Sponsored Links
  10. Careful_Bodger

    Careful_Bodger

    Joined:
    11 May 2004
    Messages:
    217
    Thanks Received:
    8
    Location:
    Hampshire
    Country:
    United Kingdom
    Noted, thanks!

    Gas, existing CH pipework/future routing, flue location, and the constraints I mentioned all to some or other extent raised my interest in options for the condensate drain location.
     
  11. Careful_Bodger

    Careful_Bodger

    Joined:
    11 May 2004
    Messages:
    217
    Thanks Received:
    8
    Location:
    Hampshire
    Country:
    United Kingdom
    Thanks for confirming the need for topping up the limestone! Would this be stated in the MIs, or elsewhere?
     
  12. Razor900

    Razor900

    Joined:
    16 Nov 2007
    Messages:
    5,625
    Thanks Received:
    2,141
    Location:
    Northamptonshire
    Country:
    United Kingdom
    Just another point of failure really and the pumps are mostly pretty poor and noisy. A soakaway is fine under a drive if done properly and with the cap exposed for service - not that anyone in history has ever topped one up ;)
     
  13. Agile

    Agile

    Joined:
    26 Jun 2004
    Messages:
    63,982
    Thanks Received:
    4,583
    Location:
    London
    Country:
    United Kingdom
    Just the body of a plastic soakaway is expensive and that is before buying limestone to fill it with. I think the two I have would cost about £19 each. But could be made for £3 by hacking a bit of drain pipe.

    The condensate pumps are cheap to buy or replace. All mine and those I have seen are quiet with a small induction motor.

    Depending on the soil conditions up to 20 litres of condensate a day could cause ground movement on the driveway. Not worth risking in my view.
     
  14. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,034
    Thanks Received:
    9,420
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Really? compared to a pump? :LOL:

    They're peanuts too and last for ages.
     
  15. mcmoby69

    mcmoby69

    Joined:
    19 Jun 2011
    Messages:
    6,561
    Thanks Received:
    2,213
    Location:
    Lancashire
    Country:
    United Kingdom
    just had to replace the chippings in a soakaway I fitted 6 years ago.......
     
  16. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page