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Cutting Concrete??????

Old 12-06-2019, 01:01 AM
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Default Cutting Concrete??????

In the spring I'm building a paver walkway and steps from my driveway to my back porch. In order for it to look right I need to remove about a 10' x 3' piece of my concrete driveway. So can I get away with cutting the 10' dimension with a 7" concrete/diamond blade in a 7 1/4" circular saw or do I need to rent a real concrete saw. I have cut plenty of brick, block, tile/green-board and even a few small cuts in concrete with a circular saw but never a big cut like that. Who has actually tried it?
Old 12-06-2019, 01:08 AM
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Any idea how thick this is? I would think a driveway would be at least 4", that size saw will at best only go 2-3/4" deep.
Old 12-06-2019, 01:18 AM
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Originally Posted by polarred21 View Post
Any idea how thick this is? I would think a driveway would be at least 4", that size saw will at best only go 2-3/4" deep.
Suppose to be 4" but I have never seen a residential contractor get one that thick. I was thinking if I can get a 2 3/4" cut in the concrete it should demo easy enough.
Old 12-06-2019, 02:07 AM
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Eliminate a lot of frustration rent a concrete saw for a couple of hrs. Done.
Old 12-06-2019, 02:43 AM
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Definitely rent a saw.
Gas powered.
With water attachment.
Old 12-06-2019, 02:45 AM
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Even better if you can hire one on wheels, saves bending over.
Old 12-06-2019, 02:52 AM
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Originally Posted by noelm View Post
Even better if you can hire one on wheels, saves bending over.
I have cut a lot of concrete. I may also add that I am always looking to save a few $$$ when I can. RENT A SAW and the walk behind is a great idea. They are not that much!
Old 12-06-2019, 03:18 AM
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Originally Posted by jkmjr View Post
I have cut a lot of concrete. I may also add that I am always looking to save a few $$$ when I can. RENT A SAW and the walk behind is a great idea. They are not that much!
Walk behind would be a pain due to the restricted area It would have to be a handheld. The only real "concrete" cutting I have dealt with at work is pavement and that is a whole different animal. Have you ever cut with a circular saw? I know the vertical construction guys use them I just don't know what the production rate on one would be.

Last edited by xl883lo; 12-06-2019 at 03:28 AM.
Old 12-06-2019, 03:38 AM
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I just opened up a 2x3 portion of mine a few weeks ago.
​​​​​​I rented, I believe a 14" concrete saw that actually cut about 5" deep. Unfortunately my driveway was almost 7" thick in that area. It took a lot longer than planned as my cuts got smaller to open a hole while chipping away.
Finally finished it up with a hammer drill and a large chisel bit.
Old 12-06-2019, 03:46 AM
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Originally Posted by PeteH View Post
Definitely rent a saw.
Gas powered.
With water attachment.
This.

I've used the circular saw blades for really small things, that is not the right approach for 10" of driveway concrete that has rebar in it. A 4 hour rental should be pretty cheap, and you'll be done in 20 minutes.
Old 12-06-2019, 03:54 AM
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And you won't burn up your circular saw.
Old 12-06-2019, 04:01 AM
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14” walk behind is nice and compact and will make short work of the job. They are not self propelled making them a lot smaller than a typical floor saw.

a 14” gas cutoff saw will work as well, but not be as easy to make a clean cut.

should be able to rent either from sunbelt or Home Depot for under 200, including buying a general purpose blade.
Old 12-06-2019, 04:06 AM
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I've done large sections of a pool deck. Save your back...get a walk behind, and a jackhammer for those surprise thicker spots..esp if a large rock or boulder is underneath and the concrete bound to it.
Old 12-06-2019, 04:15 AM
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Water is your friend .
Old 12-06-2019, 04:20 AM
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Rebar would be my concern.
Old 12-06-2019, 04:22 AM
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If you can't use a walk behind which would be preferred for the length of the cut then minimum 12" or 14" cutoff saw. Use a board as a straight line. Cut down 4" deep so the concrete breaks off with a clean edge. I wouldn't do that job without a jack hammer.
They sell carbide blades that would zip through heavy rebar if its just wire mesh sometimes the jack hammer will break it
Old 12-06-2019, 04:35 AM
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Originally Posted by autobaun70 View Post
14” walk behind is nice and compact and will make short work of the job. They are not self propelled making them a lot smaller than a typical floor saw.
a 14” gas cutoff saw will work as well, but not be as easy to make a clean cut.
should be able to rent either from sunbelt or Home Depot for under 200, including buying a general purpose blade.
Originally Posted by YeOldeStonecat View Post
I've done large sections of a pool deck. Save your back...get a walk behind, and a jackhammer for those surprise thicker spots..esp if a large rock or boulder is underneath and the concrete bound to it.
As I said in an earlier post the walk behind is out.due to a fence and a brick wall being in the way. Shouldn't be any big rocks where it is. I hoped to cut it into 3 sections (400# each) drill it for lifting pins and pull it out with the tractor.

As far as a straight cut that is one reason I was considering a circular saw. I thought I would Tapcon a piece of angle to the driveway as a fence and at a minimum use the circular saw to score a first pass if I needed a 14" saw.

Last edited by xl883lo; 12-06-2019 at 04:47 AM.
Old 12-06-2019, 04:42 AM
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Vote for a gas powered hand concrete saw with a hose attachment.

also for ease of cutting straight get a good chalk line and some clear spray paint. Pop your cut lines and spray paint over that so it doesn’t wash away in the water.

lots of cuts in concrete here
Old 12-06-2019, 04:46 AM
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Don't want to be a wet blanket, but there are serious regulations on the books now for silica dust. Unless you use a wet saw or a saw with a dust extractor. If you have a pissy neighborhood and a complaint is made, you could be is some hot water. I know because I am in the manufacturing business related to stone and when the regs went into effect, the State came a-callin. We had no violations, BUT bottom line is if you have any exposure (if you're on an acre lot or more no one will see or care) you need to use a wet saw. A 14" Diamond Blade will do your work and rebar is no issue. You may want to just check craigslist and pay a lump sum to have it cut. Diamond saw rental PLUS blade is probably $150 +. My 2 cents PS- Don't waste your time with the "Abrasvive type " blade- get a segmented diamond blade.
Old 12-06-2019, 04:48 AM
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I have cut plenty with a circular saw.

Don’t do it, it sucks.

Slow, dust right in you face, kills the saw, etc.

Even an angle grinder with the guard removed is better. Remove the diamond shaped knockout from a 7 1/4 diamond blade and stick it on the angle grinder for tight spots. Use caution.

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