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Thread: Chop or Core Wall

  1. #1
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    Chop or Core Wall

    If you had (4) 4" conduits going through a masonry bock wall(existing) would you chop out a "window" or core individual holes. I believe it's usually an opening made with hammer drill. Thanks.

  2. #2
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    Are the blocks hollow or solid cored?

    If it's hollow just bash though with a single jack sledge hammer.
    Once in a while you get shown the light
    In the strangest of places if you look at it right. Robert Hunter

  3. #3
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    Quote Originally Posted by ActionDave View Post
    Are the blocks hollow or solid cored?

    If it's hollow just bash though with a single jack sledge hammer.
    To be honest, I don't know.

  4. #4
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    Quote Originally Posted by mstrlucky74 View Post
    To be honest, I don't know.
    You should probably find out, as it makes a big difference as to the preferred method.
    Cheers and Stay Safe,

    Marky the Sparky

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    Quote Originally Posted by K8MHZ View Post
    You should probably find out, as it makes a big difference as to the preferred method.

    Ok, thanks.

  6. #6
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    With 4-4" conduits going through the wall, that is the equivalent of taking out two full blocks. You might not have any issue if you spread them out, but if they are close together, the blocks above may lose stability. In that case, a metal lintel (basically angle iron) should probably be installed above the removed sections. I would consult a block mason. Coring is probably more stable since you are leaving more material in place.

  7. #7
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    Quote Originally Posted by mstrlucky74 View Post
    If you had (4) 4" conduits going through a masonry bock wall(existing) would you chop out a "window" or core individual holes. I believe it's usually an opening made with hammer drill. Thanks.
    I'd put 2 holes in one block and 2 in another. Avg block is 8"H x 16"L, you're not getting 4 4" conduits thru one block. I'd just as soon not have to use large fire stop bricks to seal the opening or pay a mason to fix the hole.
    Electricians do it until it Hertz!

  8. #8
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    As Dave mentioned if it's solid filled then core drill, if the blocks ares still hollow then chop the hole. Solid filled walls also may have rebar in them which is easier to core drill through.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  9. #9
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    Thanks guys. Are block walls most always the hollow cored type?

  10. #10
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    Not most always, if the block is below grade or being used to hold side pressure then they are filled. Probably other reasons as well.
    If you aim at nothing, you will hit it every time!

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