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Discuss Drill through granite worktop in the Plumbing Forum area at

  1. hammers4spanner

    hammers4spanner Plumber GSR

    Need to go through with a condensate pipe. It' granite transformation so about 5 mm thick.
    What do you guys suggest to use ?
  2. jtsplumbing

    jtsplumbing Plumber GSR

    Do what you usely do Big Hammer lol :)! is it proper Granite ? what about those diamond sets that drill ceramic tiles ?
  3. hammers4spanner

    hammers4spanner Plumber GSR

    All I know it' called granite transformation.
    They lay it on top of existing worktops
  4. rpm

    rpm Trusted Plumber Top Contributor!!

    Just googled the stuff to see what it is and they have stockists and showrooms with phone numbers, give a couple of them a call tomorrow and see what they say.
    • Like Like x 2
  5. scott_d

    scott_d Plumber GSR

    Tile drill bit?
  6. gmartine

    gmartine GSR

    Diamond hole saw then I suppose an ordinary hole saw or flat bit saw to get through whatever the granite has been laid on.

    Tile Diamond Holesaw 25mm
    Last edited: Apr 29, 2018
  7. S.P.S.

    S.P.S. GSR

    Agreed on diamond hole saw. I use these ones

    Erbauer Diamond Tile Drill Bit 25 x 80mm

    Very good for the money. Trouble is with the one above is they don’t last long! You might find you drill half the hole and it’s dead.
    • Like Like x 1
  8. gmartine

    gmartine GSR

    Those bits aren't the best quality that's true but are easily killed when pressing too hard and overheated so the diamond coating gets glazed, they can be redressed or at least partially so by using on something softer but then the OP only has to drill through 5 mm.
    • Agree Agree x 1
    Last edited: Apr 30, 2018
  9. hammers4spanner

    hammers4spanner Plumber GSR

    What do you use to guide them through?
    Don't want them sliding all over thje worktop
  10. S.P.S.

    S.P.S. GSR

    You can start it by hand, use your spare hand as a guide, lightly hold around the bit (gloves), drilling slowely and gently to start, hold the drill at a slight angle so one edge bites. Don’t push down hard. Or you can buy the suction guide, but you may not have room for this up against the wall?
  11. firemant

    firemant Plumber GSR

    I used to regularly drill 6mm holes through granite using a standard drill bit. Never did 22mm but would have thought starting small and expanding up would Beno problem.

    But avoid hammer :)
  12. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR Top Contributor!!

    You could either get a guide or make a guide out of wood like ply our something.
    • Informative Informative x 1
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