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Subject Author Date
How to cut control joints Walter R. 06-29-2006
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Posted by Walter R. on June 29, 2006, 12:48 am
I need to cut 2 control joints in my 4' concrete patio slab, each 11 feet
long.

Can I do that with my old circular hand saw? Would I use a masonry blade
(the clack stuff) or a do I need a diamond blade (expensive)?

How deep should the control joint be?

--
Walter
www.rationality.net
-



Posted by on June 29, 2006, 9:13 am
You need to rent a concrete sway. Typically there is a hourly fee plus
whatever portion of the diamond blade you use (like a tile saw). I have
used a masonry blade and skil saw before, but the rental will likely
prove cheaper than burning up your saw.

I think theyr'e supposed to be 1-2" deep, but I could be wrong on that.


Posted by on June 29, 2006, 9:14 am

That should say concrete SAW.


Posted by on June 29, 2006, 11:06 am
I really don't think it's 1-2" deep. Do some research to find the
exact value.


Posted by on June 29, 2006, 11:24 am

Walter R. wrote:
> I need to cut 2 control joints in my 4' concrete patio slab, each 11 feet
> long.
>
> Can I do that with my old circular hand saw? Would I use a masonry blade
> (the clack stuff) or a do I need a diamond blade (expensive)?
>
> How deep should the control joint be?
>
> --
> Walter
> www.rationality.net
> -

On small jobs like yours we use a skill saw with a diamond blade.
Typically we go 25% of the thickness of the slab.


What are the dimensions of your patio?


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