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

Raising older larger style manholes

Discussion in 'In the Garden' started by shabbaranks, 11 May 2020.

  1. shabbaranks

    shabbaranks

    Joined:
    4 Jan 2012
    Messages:
    176
    Thanks Received:
    1
    Country:
    United Kingdom
    Hi guys,
    As Ive more time on my hands with all this lockdown stuff Im tidying up the garden. Ive got a couple of large older manholes which ideally I'd like to raise but I cant find any risers big enough??

    The manholes are 600mm (rectangle) and I need to check the round one but does anyone know where/how I can do this? Ive read some people just cover them but I don't think thats a good idea???
    Thanks as always
     

    Attached Files:

  2. Sponsored Links
  3. CBW

    CBW

    Joined:
    26 Sep 2019
    Messages:
    9,131
    Thanks Received:
    2,462
    Location:
    North
    Country:
    United Kingdom
    Good morning,

    As far as I know, the rectangular ones are brick, so would just need building up to suit, the circular one might just be a riser required.
     
    • Thanks Thanks x 1
  4. shabbaranks

    shabbaranks

    Joined:
    4 Jan 2012
    Messages:
    176
    Thanks Received:
    1
    Country:
    United Kingdom
    Thanks Chris Im no builder so my brickwork might need some practice will have a go and see what happens. Im guessing there are no issues with doing this as this drain is for soil waste (the round is rain etc) not sure what the technical terms for these are
     
    • Like Like x 1
  5. CBW

    CBW

    Joined:
    26 Sep 2019
    Messages:
    9,131
    Thanks Received:
    2,462
    Location:
    North
    Country:
    United Kingdom
    Correct soil waste, although a lot refer to it as foul waste. The other is classed as rain or surface. The manhole cover needs to be mortared in as well.
     
    • Thanks Thanks x 1
  6. shabbaranks

    shabbaranks

    Joined:
    4 Jan 2012
    Messages:
    176
    Thanks Received:
    1
    Country:
    United Kingdom
    Ive just lifted the cover and your right its seems relatively easy to add some blocks to raise it and then replace with one of the newer\lighter covers. This might sound like a stupid question but what sort of blocks would you use to raise the manhole cover? Ive got some spare driveway blocks but Im assuming they wont be correct?

    Thanks
     
  7. CBW

    CBW

    Joined:
    26 Sep 2019
    Messages:
    9,131
    Thanks Received:
    2,462
    Location:
    North
    Country:
    United Kingdom
    Last edited: 11 May 2020
    • Thanks Thanks x 1
  8. Hugh Jaleak

    Hugh Jaleak

    Joined:
    3 Feb 2008
    Messages:
    7,405
    Thanks Received:
    1,741
    Location:
    Northamptonshire
    Country:
    United Kingdom
    Round chamber, 450mm risers are required to raise height to suit, but you'll need to see what the existing manufacturer is, and get same to suit, not all are interchangeable.

    The others, depends on construction of chamber under the cover, engineering bricks would be required for a manhole. They may also be shared drains, in which case are the Water Company's asset, and you would be wise to gain written permission before making any alteration to these.

    Edit, should add for the OP, the shape of the cover is totally irrelevant to what the drain is carrying. Some heavy duty covers can sometimes be marked with FW or SW to indicate Surface/Storm Water or Foul Water, and there was a school of thought some years ago that the triangular covers should be position to point in direction of flow, but that never seemed to become a rule of thumb.

    Best cover by a long shot is a round one, gives more room to access the chamber below and the added advantage you cant drop the bl00dy thing down the hole.
     
    Last edited: 11 May 2020
    • Thanks Thanks x 1
  9. 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

     
  10. Sponsored Links
Loading...

Share This Page