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Cavity Tray at DPC level vs lean mix infill

Discussion in 'Building' started by williamglossop, 17 Mar 2021.

  1. williamglossop

    williamglossop

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    I'm seeing more and more use of cavity trays all the way round a build at dpc level rather than two level DPC's (inner/outer leaf) with angled lean mix concrete.


    Just wondering why things have changed more towards a massive tray all the way round.....
     
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  3. ^woody^

    ^woody^

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    Things have not changed
     
  4. williamglossop

    williamglossop

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  5. williamglossop

    williamglossop

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    Why would one method be used over the other...
     
  6. ^woody^

    ^woody^

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    The only practical reasons would a difference in internal floor level, or a radon barrier
     
  7. noseall

    noseall

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    The brand new home we are working on at present (Redrow Homes) has trays all round at DPC (B&B floors). I can't see any reason why the addition and it's deffo not a radon risk area. Builders must be steering away from sub DPC cavity filling perhaps in favour of DPC level trays..?
     
  8. ^woody^

    ^woody^

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    Lose fill cavity insulation?
     
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  9. stuart45

    stuart45

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    With wheelchair access being required, ground levels need to be higher, (which requires a tray) is another reason.
     
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  11. noseall

    noseall

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    Probably. Why would it matter having sub-dpc lean mix cavity fill though?

    Have you seen how the brickies keep the cavities clean these days Woods?
     
  12. ^woody^

    ^woody^

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    It's been a long long time since I've seen any proper brickies working
     
  13. noseall

    noseall

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    They lay hessian sacking in the bottom of the cavity, build the walls then smash out every third block and drag out the snot covered sacking.
     
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  14. ^woody^

    ^woody^

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    :eek:

    Bloody radicals
     
  15. 23vc

    23vc

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    Is there no insulation in the wall at that point then? That sounds a right b4ll ache
     
  16. noseall

    noseall

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    I think the idea was contrived with partial fill in mind.
     
  17. noseall

    noseall

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    Indeed.

    I showed my young oppo the blocks that had been replaced, when we recently did an outer skin knock-down.
    A lot of effort but I do agree with it. I have seen snots stacked up to the third course above DPC, filling the (50mm) cavity.
     
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