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Drilling into stoney wall/pebblecrete

Discussion in 'General DIY' started by MPEJ, 11 Mar 2019.

  1. MPEJ

    MPEJ

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    Location:
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    I live in an 1950s ex local authority house with walls that are made of what appears to be aggregate mixed with concrete and I need advice on drilling.

    It’s not smooth pebblecrete as I would call it as it is lumpy stones of approx 20mm+ across loosely glued together with a sheen on concrete.
    Having been up in the loft where it’s exposed and unrendered I’ve got a better idea of it.

    Every time I try to drill it either the bit glances off the stones and the cavity goes on the wonk or the stones dislodge and I end up with a massive hole- an attempt to put a 25mm sds through the wall to fit some trunking resulted in a nearer 40mm hole as pebbles came loose and fell out the hole.

    Has anyone encountered this before? Any advice?
    My present thoughts are upgrade from my Bosch pbh2000 sds to something nearer 1500watts or start using a diamond core.

    I’d like advice before striking out on either costly solution.
     
  2. foxhole

    foxhole

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    Start hole with 6mm bit then the larger bit won’t wander .
     
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  4. Alastairreid

    Alastairreid

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    Sounds like a no fines house.
     
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  5. Brigadier

    Brigadier

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  6. DIYnot Local

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