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Posted by on November 27, 2006, 8:54 am
What's the trick to cutting concrete blocks in half?
I am blocking up some old foundation windows using 8 x 8 x 16 concrete
blocks and I need some partial (half) blocks to complete the run. I
have a masonry blade, a 3-inch stone chisel and a 3-lb hammer. I've
been scoring the block in the middle, then using the chisel to crack
it.
I can't get the block to split cleanly in the middle -- one end ends up
crumbled. I do get 1 decent half block for my effort, but waste the
other half.
Can this be done?
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Posted by hallerb@aol.com on November 27, 2006, 9:13 am
use masonary blade in circular saw, perfect cut but dusty.
dont block those windows in a fire how would one get out?
ventilation?
its never a good idea to elminate windows.
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Posted by EXT on November 27, 2006, 9:20 am
Done it many times with both a chisel and a masonry hammer which has a
chisel on one side of the head, also a 3 pound hammer will do it, but not so
neat. You carefully tap along the line where you want to cut the block on
both sides, you will note that it has a ringing sound when you hit it, you
keep going over the line rotating sides, until the ringing sound turns flat
as the crack grows, once more over the block and it should part. It sounds
like you are trying to cut it too hard by hitting it too hard, it really
doesn't take much tapping once you get the feel for it. If you find that you
cannot successfully cut a block, most concrete block plants make half blocks
that you could use.
> What's the trick to cutting concrete blocks in half?
>
> I am blocking up some old foundation windows using 8 x 8 x 16 concrete
> blocks and I need some partial (half) blocks to complete the run. I
> have a masonry blade, a 3-inch stone chisel and a 3-lb hammer. I've
> been scoring the block in the middle, then using the chisel to crack
> it.
>
> I can't get the block to split cleanly in the middle -- one end ends up
> crumbled. I do get 1 decent half block for my effort, but waste the
> other half.
>
> Can this be done?
>
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Posted by on November 27, 2006, 11:28 am
On 27 Nov 2006 05:54:07 -0800, jgold@desktoppub.com wrote:
>What's the trick to cutting concrete blocks in half?
>
>I am blocking up some old foundation windows using 8 x 8 x 16 concrete
>blocks and I need some partial (half) blocks to complete the run. I
>have a masonry blade, a 3-inch stone chisel and a 3-lb hammer. I've
>been scoring the block in the middle, then using the chisel to crack
>it.
>
>I can't get the block to split cleanly in the middle -- one end ends up
>crumbled. I do get 1 decent half block for my effort, but waste the
>other half.
>
>Can this be done?
Do you have the right kind of block? Blocks intended to be split have
a void in the center. If the web in the center is solid you don't have
the right block. There are actually at least 4 kinds of 8x8x16" blocks
not counting specialties.
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Posted by Robert Allison on November 27, 2006, 12:11 pm
jgold@desktoppub.com wrote:
> What's the trick to cutting concrete blocks in half?
>
> I am blocking up some old foundation windows using 8 x 8 x 16 concrete
> blocks and I need some partial (half) blocks to complete the run. I
> have a masonry blade, a 3-inch stone chisel and a 3-lb hammer. I've
> been scoring the block in the middle, then using the chisel to crack
> it.
>
> I can't get the block to split cleanly in the middle -- one end ends up
> crumbled. I do get 1 decent half block for my effort, but waste the
> other half.
>
> Can this be done?
>
Why would you even want to do this? Just buy some 8x8x8s. Go
to a real masonry supplier and you will be surprised by what
they have to make your life easier.
--
Robert Allison
Rimshot, Inc.
Georgetown, TX
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