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Unread 10-13-2020, 02:31 PM   #1
JerseyDIYguy
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How to make a 1-3/4" hole in cinder block

I need to install conduit through the cinder block foundation of the addition on my house. There is already a 1" hole that I drilled with a 1" masonry bit. The existing hole is about 1/3 of the way from the edge of the block, so it goes through the hollow part. I own a hammer drill with a 1/2" chuck.

Essentially, I need to expand the existing 1" hole to 1-3/4" diameter. I'm only ever going to need to make this one hole, so I'm looking for budget recommendations.

I know this is a tile forum, but you guys are the best I know about all things concrete
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Unread 10-13-2020, 02:55 PM   #2
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Wink

its a tool, you'll find if you have it you'll use it somewhere else.
Or maybe you can rent one?
drill a bunch of smaller holes around the perimeter(of the size) and hit it with a hammer?
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Unread 10-13-2020, 03:24 PM   #3
jadnashua
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How pretty do you want it to be? A hole saw would make it pretty, chipping it out probably not. Either would work. Once the pipe is through, if you sleeve it, you could fill what's left with something like hydraulic cement. Just depends...
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Unread 10-13-2020, 04:47 PM   #4
smifwal
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$35.00 will get you a hole saw bit at home depot or lowes
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Unread 10-13-2020, 06:23 PM   #5
Davy
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And even cheaper on Amazon if you have time to wait on it.
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Unread 10-13-2020, 07:45 PM   #6
JerseyDIYguy
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e3 - I'm with you. I have an impressive tool collection (36" pipe wrench anyone?), but I just don't see needing to drill a second 1-3/4" hole in concrete during the remainder of my days. I thought about drilling a number of small holes around the perimeter of the existing hole, but that has always turned into a ton of work and mess for me.

jad - It doesn't need to be pretty. I can stuff caulk/silicone around this and no one will see it, so I have options.

So a conventional (not hammer) drill, and a hole saw like this one:

https://www.amazon.com/Drilax-Diamon...%2C155&sr=8-14

Along with a decent amount of patience?
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Unread 10-13-2020, 07:55 PM   #7
jadnashua
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A good bit in a hammer drill into a block like that is not much harder than drilling hardwood. Quick work. Dusty, but not an issue.
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Unread 10-13-2020, 08:08 PM   #8
JerseyDIYguy
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jad - I understand what you're getting at with a masonry bit designed for hammer drills. However, the one I linked is more like a conventional hole cutter (no hammer action). I haven't found a 1-3/4" hammer drill bit -- only rotary hammer bits in that size.
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Unread 10-13-2020, 08:21 PM   #9
jadnashua
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I was talking about using a smaller bit to make a bunch of holes around what's there, then knocking it out...a masonry bit that large would be expensive! Cutting into block, a small one would work fine and chip out what's left. Depending on the pipe you're using, it's usually a good idea to put a sleeve over it so it can expand/contract without the block acting like sandpaper on it, so a larger hole might be called for.
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Unread 10-14-2020, 06:29 AM   #10
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Maybe somethin like this?

https://www.lowes.com/pd/DEWALT-Stee...E&gclsrc=aw.ds
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