Drill 4" round hole in 6" thick cement/brick wall


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Old 01-28-21, 01:28 PM
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Drill 4" round hole in 6" thick cement/brick wall

I would like to install a new ceiling fan in a bathroom which has none.
I will have to cut a square hole into the bathroom ceiling itself. The fan would go between two existing ceiling lights so that should be helpful. The ceiling is maybe 2 inches of solid concrete and should have plenty of hollow space above for the fan itself.
I will have to run perhaps 5 ft of four inch PVC from the fan out an exterior 6" concrete/brick wall.

I am not a contractor. This is a one time deal. I really would like a one use solution.
I see all these concrete hole saws on the internet.
Can I get by with a 2" deep saw, cut the cement, withdraw the saw, chip out the hole and repeat ?

Is there a simpler solution ? The normal way to do it here would be for a mason to chip away a hole by hand using a hammer and chisel. The right tool may be a lot cheaper.

Thanks.
 
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Old 01-28-21, 01:39 PM
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I'd draw out the circle and then drill a series of small holes with a masonry bit around the circle. It should be a simple matter to knock out the concrete once your holes are drilled.
 
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Old 01-28-21, 02:33 PM
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What Mark said and I'll add that it will be worth it to rent a good hammer drill (Hilte?) and buy your own bit.
 
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Old 01-28-21, 02:57 PM
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Thank you both.

I already own a Dewalt hammer drill and some foot long drill bits for putting holes in my walls.
I'm in Mexico and Dewalt must be made in Mexico because I can get it at a better price than the US (which is very unusual).

While I have you - I have my eye on one of these - maybe not for this project - but I have to take down a 10 foot long by 4 foot high X 1 foot think stone wall which has a large propane tank behind it. (We no longer use gas to heat the pool but have installed 18 boxes on the roof with copper tubing instead). I need to knock down the stone wall to be able to drag the gas tank out of there...

https://www.amazon.com.mx/gp/product...MBWVCY9T&psc=1

Any opinions ?

Thanks again.

Edit : In Mexico - perhaps the only thing you can rent is a car.
 
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Old 01-28-21, 03:12 PM
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Big sledgehammer with a large person swinging it.

Is the price in that link in Pesos ?
If yes.... that's equivalent to around $225 US. I see it for less than that.
 
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Old 01-28-21, 03:19 PM
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Yes - that is probably the normal way around here.
We also have these maybe 5 foot long, heavy metal rods with a point on one end and a 'wedge' on the other. Never saw them in the US.
That came in handy when I had to dig up my septic system.

The sledgehammer solution might require two people though. One to swing the hammer and the other to hold the chisel.

 
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Old 01-28-21, 03:24 PM
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I have two of those bars here. Maybe called digging bars.
Digging bars

Why hit a chisel..... hit the rocks starting at the top.
 
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Old 01-28-21, 03:28 PM
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Well I never saw them in Oradell :-)
 
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Old 01-28-21, 03:47 PM
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Pinch point bars. Also in that description. I couldn't think of the name before.
 
 

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