Drilling thru Concrete Block

Discussion in 'Home Theater Projects' started by Eddie L, Jul 28, 2004.

  1. Eddie L

    Eddie L Stunt Coordinator

    Jun 15, 2003
    Likes Received:
    I know there was discussion about this awhile back, but I thought I'd again put in my 2 cents.
    Yesterday I had to make a 4" hole thru my 8" basement block, that was filled with concrete.
    This was done for my exhaust fan.
    I rented a Milwaukee hammer drill, 5/8" bit on a 12" shaft, and the hammer chisel all for $35.00 for the day....no hourly rate.
    I proceeded by drilling about 10 pilot holes around the exterior of my sketched outline
    Then taking the power chisel I just chiseled out the interior.
    Luckily, I missed the rebar!
    It took about 45 min.
    With clean up, a little over an hour.
    Hope this helps someone.
    I know there was talk about using water to cool things down,, not using a hammer drill because of damage to the exterior of the block.
    All I can say is, I've done this before and this way works slick as snot!
    If I would have been thinking I would have taken pics, but the duct is already in place....sorry.
  2. Frank Zimkas

    Frank Zimkas Supporting Actor

    Mar 10, 2002
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    I've had to do the same thing on different occasions. The hammer drill option will work, but for sheer speed and ease of use, a 4" coring bit is the only way to go. No water needed and available at most bigger rental yards. They'll cut right through rebar as well.

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