Concrete cutting

[50flathead]

Anybody have experience widening garage door openings? My 28 x 28 x 11 garage has a pair of 9 x 7 and I'd rather have 10 x 8. The framing is straight forward. Have a 18" tall by 8" thick concrete stub wall that would need to be sawed through and ground to match the surface contour of the floor. Is this a common job for a competent tradesman?

 

[slidewayes]

Yes .

 

[Hilltopmasonry]

Just did it today...putting a 12 foot overhead door through a brick wall and need to remove a foot of foundation to be level with the inside floor


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[ItsNemo]

Yes .

+1 Yes.

 

[LX-Markham]

We put a window in a basement wall, similar thing, contractor used a concrete chainsaw. Coolest toy I have ever seen!

 

[Hilltopmasonry]

We put a window in a basement wall, similar thing, contractor used a concrete chainsaw. Coolest toy I have ever seen!

Yes, unfortunately they have a high cost ratio to operate because the chain and chain bar damages easy if the operator moves or shifts the saw while using it kinking them. A friend of mine that owns a contractors equipment rental shop stopped carrying them because renters would cause more damage than he was making on the saws

This is the saw that i own...a cut and break double blade saw which will cut 18 inches deep!
https://www.google.com/imgres?imgur...J_TAhUlxYMKHbRfDqEQMwgpKAQwBA&iact=mrc&uact=8




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[ishiboo]

I'm with Hilltop. I rented a concrete chainsaw to cut my door opening larger. Had to buy a $280 chain to do it. Sprocket blew in the first 4" of the cut.

While I was running all over town, my buddy used my regular concrete saw (K760) to cut as far as he could in each side, and then hammered in railroad spikes he had and split it off. Could have saved a lot of money doing that the first time. This was widening a 8' opening to just over 10' through a 14" thick concrete wall.

Even with a cut and break saw, the operating costs are probably like a quarter of what the concrete chainsaws run.

 

[larry4406]

I'm with Ishibo. Concrete blade in old circ saw will give you about 3.5" depth. Drill thru or measure and mark both sides carefully. Cut from both sides. Pound wedge to break. Then diamond blade in a 4-5" grinder for the snapped core. If you measure right the cuts will align perfect.

 

[ishiboo]

I'm with Ishibo. Concrete blade in old circ saw will give you about 3.5" depth. Drill thru or measure and mark both sides carefully. Cut from both sides. Pound wedge to break. Then diamond blade in a 4-5" grinder for the snapped core. If you measure right the cuts will align perfect.

If you go this route, I'd rent a concrete saw with a 14" blade. Even with my 14" saw it was a lot of work. For alignment, we drilled 7/16" holes with a SDS first at top and bottom, then snapped a chalk line from top to bottom. That got us very close.