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

gravel driveway: concrete crush underneath type1?

Discussion in 'Building' started by ash_h, 7 Jan 2020.

  1. ash_h

    ash_h

    Joined:
    7 Jan 2020
    Messages:
    3
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi,

    I have a question that I hope someone can help with their expertise.

    I'm having a gravel driveway installed tot he front of my house. The area before was partly block paved but mostly grass.

    The agreed spec was to dig out 200mm, lay a geotextile membrane and then 150mm type 1 (compacted), finishing and 50mm gravel.

    The chap installing the driveway showed me a few soft spots during the digging out, but before they had dug to the correct depth. The digging out is now finished and they are now laying "concrete crush" (around 100mm - 150mm concrete bits) on to the geotextile membrane (will be rolled in), and will then lay 50mm type 1 (again compacted).

    Is this correct? Is it stronger than the original spec?

    Thanks
     
  2. Sponsored Links
  3. ETAF

    ETAF

    Joined:
    24 Apr 2008
    Messages:
    1,171
    Thanks Received:
    204
    Location:
    UK, Wittering, West Sussex
    Country:
    United Kingdom
    if the spec was for 200mm (8'') and they have only now gone down 100mm (4") then they have not really completed to the spec that you agreed, I would discuss with the builder.
    i'm not sure about the strength , but you agreed to 200mm . and assume paid for the labour to dig out and the ballast to fill
    I had a similar issue with new soak away, the builder who specced it, he did not come on site and the contract guys who fitted did what they could get away with, i made them dig it all up and start again and do the job as agreed, which they did , including relaying grass they had destroyed, and then they went into liquidation after i had paid them, as the turf had issues and was not growing over the soakaway - so i could not get them back to sort out
     
  4. phatboy

    phatboy

    Joined:
    22 Jan 2012
    Messages:
    2,194
    Thanks Received:
    259
    Location:
    Jersey
    Country:
    United Kingdom
    If the crushed concrete meets the spec of type 1 (40mm and down) then it really is type 1 surely?!

    Same difference.......
     
  5. ash_h

    ash_h

    Joined:
    7 Jan 2020
    Messages:
    3
    Thanks Received:
    0
    Country:
    United Kingdom
    it doesn't - that's the point. It's 100mm- 150mm concrete lumps
     
  6. Notch7

    Notch7

    Joined:
    15 Sep 2017
    Messages:
    25,309
    Thanks Received:
    1,790
    Location:
    S. Uplands
    Country:
    United Kingdom
    Thats not graded concrete crush, its broken hardcore and unsuitable.

    A sub base needs to be graded aggregate from around 40mm down to zero,

    Your big lumps wont lock together as its compacted and will have too many voids.

    When buying by the lorry load there isnt a massive cost difference between concrete crush and type 1
     
  7. ash_h

    ash_h

    Joined:
    7 Jan 2020
    Messages:
    3
    Thanks Received:
    0
    Country:
    United Kingdom
    thanks Notch7
     
  8. phatboy

    phatboy

    Joined:
    22 Jan 2012
    Messages:
    2,194
    Thanks Received:
    259
    Location:
    Jersey
    Country:
    United Kingdom
    My bad, mis-read that as being the depth, not the grade! Sorry....
     
    • 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