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Using old bricks as hardcore for paving

Discussion in 'Building' started by DIYFrustration, 10 Mar 2019.

  1. DIYFrustration

    DIYFrustration

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    We have recently done some building work, and have a lot of rubble left over - about 5 cubes. We now need to pave outside the back door. I've read in another post that the bricks should be broken down to about 2" pieces before laying it down, and to be careful to remove all plaster from the rubble before doing so.

    A couple of questions on this:
    1. How does one break up bricks into 2" pieces? can I just lay it down 100mm at a time and smash it down with a plate compactor, or do I need to bring a brick crusher in? I'm filling in about 300mm.
    2. The rubble doesn't contain any plaster, but does contain cement previously used to hold the wall together. Is this a problem, or is it only plaster I need to worry about?
    3. Can I lay the paving stones (400x400 concrete slabs) directly on the hardcore with cement/sharp sand, or would you recommend casting a slab first?
    4. The paving will come up against the house, joining at the level of the damp course. Should I add waterproofing between the hardcore/slab/paving and the house?
    5. The minimum fall for paving is quoted as 1/40, which seems quite a lot. Is this correct, or can I get away with less?
    Thanks
     
  2. footprints

    footprints

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    If you want to reuse them get a Kango or just a good SDS drill on hammer with a chisel or point bit put the brick on the ground and the bit on top with your weight behind it most bricks will break up easily unless they are engineering ones. Long job though with that amount of brick!
    Old cement will not matter.
    Finishing level with the DPC is a bad move though, maybe a French drain might help but I am not that expert on ground works myself.
     
  3. Leofric

    Leofric

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    The external ground level (paving in your case ) should be at least 150mm below the dpc in the external wall of the house. This is a fundamental requirement in building.
     
  4. tomfe

    tomfe

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    Don't smash them up it'll take too long, place the neatly with a little gap between, do one layer then fill the gaps with stone and compact. Then repeat.
     
  5. nickjb

    nickjb

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    I spent about half an hour getting nowhere breaking up my brick and other waste before giving up. Hired a crusher and it made short work of it and produced perfect MOT. Quite satisfying to do as well. I had a bit more and made sub bases for a patio and two sheds. It wasn't cheap to hirehbut was cheaper than a skip and buying new MOT and much better than just using the rubble as is
     
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  6. Leofric

    Leofric

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    So , any thoughts on levels :?:
     
  7. 23vc

    23vc

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    If there’s no way you can achieve the 150mm rule, there are possible workarounds: http://www.pavingexpert.com/dpc01.htm

    I’ve had to do one with a drained channel filled with slate chippings.
     
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  8. Nige F

    Nige F

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    1 that's fine, 2 pavingexpert site will have advice
     
  9. EddieM

    EddieM

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    I don't think crushed brick would class as MOT Type anything :whistle:
     
  10. DIYFrustration

    DIYFrustration

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    Thank you all for your responses. This has been very helpful.

    Yes, I should be able to get to 150mm below the DPC. That's not a problem. It will be a bit of a step and will require a bit of digging, but doable.

    This is a useful link - thank you. I'm getting most of what I need from there.
     
  11. DIYnot Local

    DIYnot Local

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