How does the layman drill a 2" hole in concrete block?

Discussion in 'Remodel Forum & Blog' started by Lakee911, Oct 19, 2009.

  1. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

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    Subject says it all ... how does the layman (me) drill a 2-1/2" diameter hole through an 8" hollow concrete block wall?

    Would a carbide tip hole saw on an extension do the job? Center bit won't be masonary bit.... :(


    Thanks,
    Jason
  2. iminaquagmire

    iminaquagmire DIY Senior Member

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  3. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

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    Your link didn't work. :(
  4. Ian Gills

    Ian Gills Senior Robin Hood Guy

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    It's EGay.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    If you only needed to do a couple, a concrete block wall shold be able to be drilled with a carbide holesaw. Note, if you hit a rib, it would be a big pain whatever you used. The centerhole bit can probably be found with a carbide tip, or, just drill the hole with one, then, the bit is just a guide. In fact, you could just use the shaft and not dull it at all. Once the hole saw is started, you don't need the center bit but you need to be careful. Diamond core bits often do not have a center bit, and it is an aquired skill to start them and get the hole where you want without it walking all over the place (this would probably work with the hole saw as well). Basically, you start with the drill at about a 45-degree angle so only a little edge is cutting, once it makes a decent divot, you slowly pivot the drill so it is perpendicular to the wall and finish the hole.
  6. hj

    hj Moderator & Master Plumber Staff Member

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    hole

    IF the hole is not on a web and the wall is not grouted, a swift blow with a hammer in the center of the hole, and then tapping around the edges will give you the hole you need.
  7. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

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    Excellent advice! Thanks. I'll let ya all know how it goes in week or so when I do it. :)

    Edit: Those guys on the e-homo****** site that Ian mentioned are going to set me back at least $30 or so for a one-time use. :( So, I'm going to just drill a series of small holes and then tap it out with a hammer. I'll be mounting a 2" LB against the hole, so that will cover most of the "handy work."

    The backside is a semi-inaccessible crawl space so I'll probably just use a cold chisel and bust out a chuck.

    Thanks,
    Jason
    Last edited: Oct 19, 2009
  8. frenchie

    frenchie Jack of all trades


    Funny you should say that.


    I only just noticed your new signature...


    If you're going to quote that song, shouldn't your avatar be this guy?

    [​IMG]


    :p

    .
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