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Whats best way to drill 32mm hole through concrete for a drain hole?

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  1. #1
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    Default Whats best way to drill 32mm hole through concrete for a drain hole?

    I have a balcony that has these stupid slots in them about 10mm wide that are not sufficient for a drain hole and i want to insert 32mm PVC pipe in them instead when i retile it.
    Whats the best way to drill through the slab at a slight downward angle to the other side? its the width of a bessa block.
    Should i just use a 32mm bit on a rotary hammer drill or would it need core drilling properly?? i can get a 32mm bit for $39 and it will cost $150 for someone to come and coredrill the holes.
    The pilot hole in there, it just needs enlargening 20mm.
    im worried about ugly looking break out on the other side if i use a hammer drill and a normal bit.

  2. #2
    Senior Member TermiMonster's Avatar
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    Aldi had some cheap core bits on special last(?) week. $20 odd bucks. Don't know what sizes (range). Maybe worth a look?
    TM

  3. #3
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    dont have an aldi anywhere near me. cost more in plane tickets or fuel to goto one than its worth, i could get someone to core drill 50 holes instead for the same price.
    but for a coredrill of $20, it would be a shallow one i bet and not as deep as i require.

  4. #4
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    Hammer drilling will almost certainly cause spauling (breaking) at the back of the hole. You would be better to get someone in to core-drill it for you.

  5. #5
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    i'd steer clear of a 32mm masonary bit for under $100.... chances are it would only last half a hole. the last 18mm bit i bought cost me $80. as ken suggested, you'll get a much better job with a hole corer! hope this helps!

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