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Old 06-21-2012, 03:28 PM   #1
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Core drilling multiple holes in concrete


I need to drill two 3" holes and one 8" hole in my basement wall. These holes need to be drilled somewhat close together because I only have a 24" trench to work with on the outside of the wall. My question is how do I position the holes? Is it best to drill them in a row or on top of each other? Maybe the two small ones on top of each other next to the larger hole. I don't want to compromise the wall

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Old 06-21-2012, 03:39 PM   #2
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Core drilling multiple holes in concrete


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I need to drill two 3" holes and one 8" hole in my basement wall. These holes need to be drilled somewhat close together because I only have a 24" trench to work with on the outside of the wall. My question is how do I position the holes? Is it best to drill them in a row or on top of each other? Maybe the two small ones on top of each other next to the larger hole. I don't want to compromise the wall

Thanks


And i assume they have to be within the 24",so horizontal would be the way to drill them,and space them farther apart.

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Old 06-21-2012, 03:42 PM   #3
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Core drilling multiple holes in concrete


Yes they all need to be within the 24". Only two of them need to be low to prevent freezing. The other could be higher to creat a triangle pattern. Just looking to prevent cracks.
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Old 06-21-2012, 03:49 PM   #4
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Core drilling multiple holes in concrete


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Yes they all need to be within the 24". Only two of them need to be low to prevent freezing. The other could be higher to creat a triangle pattern. Just looking to prevent cracks.

Better to drill them in a single row,triangle has a much better chance of cracking.
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Old 06-21-2012, 03:50 PM   #5
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Core drilling multiple holes in concrete


Just wanted to add that one of the 3" holes will be for electrical conduit so I could run that above grade if need be to elimate one of the holes. I would prefer not to since that extra bend makes it hard to pull future wire through. Im just putting rope in it now so I can pull what I want to through it later.
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Old 06-21-2012, 03:53 PM   #6
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Core drilling multiple holes in concrete


Sorry I take that back. I can't go above grade because my deck is in the way
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Old 06-21-2012, 04:01 PM   #7
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Core drilling multiple holes in concrete


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Sorry I take that back. I can't go above grade because my deck is in the way


If you can't drill all of them horizontal,then put the 8 inch hole on the bottom,and the 3 inch to form the triangle.
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Old 06-21-2012, 05:59 PM   #8
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Core drilling multiple holes in concrete


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I need to drill two 3" holes and one 8" hole in my basement wall. These holes need to be drilled somewhat close together...
I'm sure it would look neater this way, but...
have you ever used a cold chisel and sledge?

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I don't want to compromise the wall
There are lots of ways to create an opening and do it without compromising anything that don't call for core drilling.
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Old 06-22-2012, 11:29 AM   #9
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Core drilling multiple holes in concrete


All of the load will be downward on the wall. If it's block, I would stack them and minimize the amount of horizontal bridging, although this isn't a lot of material to remove from a wall anyway. Leave a 3-4 inch web between the holes and it won't make any difference.

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