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Old 07-26-2012, 07:23 PM   #1
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How to make a concrete floor smooth


We have a new floor (poured about 2 months ago) fully cured and we are planning to acid stain it. We would first like to get rid of the trowel marks and were wondering the best way to go. We also have limited funds and pipes installed to heat the floor so we can go too extreme. I found an edco concrete grinder I can rent and wither use stones or a diamond. Any advice? Any other options? We just want it smooth enough for a nice stained finish.

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Old 07-27-2012, 05:48 PM   #2
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How to make a concrete floor smooth


Grinding and polishing is the only way I know. Your choice of diamond or stone will depend on how much you have to take off and where each will be used in the grinding/polishing process. Read up online or ask the rental yard.

I would get some estimates for having the work done. By the time you rent the equipment, buy the abrasives and all it may make more sense. Maybe not but you won't know unless you check.

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Old 07-27-2012, 06:30 PM   #3
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How to make a concrete floor smooth


If you do the work yourself, be certain you purchase a NIOSH rated face mask, as concrete dust is quite damaging to the lungs. I second the idea of finding a contractor, grinding concrete is miserable work.
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Old 07-27-2012, 06:47 PM   #4
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How to make a concrete floor smooth


Quote:
Originally Posted by Daniel Holzman View Post
If you do the work yourself, be certain you purchase a NIOSH rated face mask, as concrete dust is quite damaging to the lungs. I second the idea of finding a contractor, grinding concrete is miserable work.
Yup! Noise supression would be prudent also. And wear a mouth guard because the thing will rattle your fillings out!

Good news is you will get a work out. Concrete grinders are one of those machines that build muscle tone and character instantly!

Seriously, have someone on hand just to help you maneuver it.

Make sure the dust does not enter your HVAC system. Have plenty of shop vac bags on hand. You will likely clog the motor if you run the shop vac without bags.

Last edited by user1007; 07-27-2012 at 06:50 PM.
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Old 07-27-2012, 08:33 PM   #5
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How to make a concrete floor smooth


Yeah, I'm thinking we may want to hire somebody for this part of the process and just do the stain ourselves.

Thanks for all the responses, if we go ahead we have a plan of action (no air conditioning so at least that's one thing we don't need to worry about).

Any advice on stones vs diamond? grades?

Thanks again!
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Old 07-27-2012, 09:30 PM   #6
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How to make a concrete floor smooth


How severe/high are the trowel marks at their worst? How widespread at that height? This is what will help you determine what abrasives to use. You should decide how polished you want the final floor as well. I've seen stained concrete polished to almost glass like by the time they were sealed. If you remember the concrete mix it will be helpful to those making recommendations for you.

I am going to bow out of recommendations for actual abrasives you should use since I just never did enough of this to feel confident. I sub-contracted grinding and polishing out but for one time.

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