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Old 02-05-2010, 06:40 AM   #1
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ridges on a concrete floor


I am planning on laying an epoxy finish on my garage floor. I was told that any unevenness in the concrete would show so I decided to use a self-leveling underlayment. This was the first time I've tried something like this and apparently I did something WAY wrong. The mixture looked to me like really thin concrete. When I poured it, it seemed to flow really easily. I had a friend pouring while I used the squeegee to get the concrete into all the corners and somewhat level it so that it can finish leveling itself off. When I looked in the next morning, I noticed that there are ridges everywhere from the squeegee. It has been several days now and they are still there. They didn't level out. Now I have two questions. 1. What did I do wrong? 2. How can I fix it? Thanks.

Blake

P.S. Total working time, including mixing the second bag was around 20 minutes.

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Old 02-05-2010, 07:02 AM   #2
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ridges on a concrete floor


Hi and welcome to the forum.
"self-leveling underlayment".... what brand?
you may need to 'sand' it smooth.

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Old 02-05-2010, 09:11 AM   #3
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It was MAPEI Novaplan 2. Do you mean "sand" it smooth with a floor grinder?

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Old 02-05-2010, 09:44 AM   #4
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ridges on a concrete floor


possibly, or you may have to redo it. maybe it wasn't thin enough to self level?
i'm hoping the guys will chime in here any time.....

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Old 02-05-2010, 09:53 AM   #5
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I just looked on the MAPEI site and they have self-leveling underlayment and self-leveling topping. Should I have used a self-leveling topping?
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Old 02-05-2010, 09:56 AM   #6
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ridges on a concrete floor


i'd guess underlayment since you're going to add epoxy? not too sure on this one.
love the different looks you can do with epoxy though, wise choice.

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Old 02-05-2010, 09:59 AM   #7
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ridges on a concrete floor


Thank you. I'm really excited to do this. Just need to get the floor looking right first.
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Old 02-05-2010, 11:46 AM   #8
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ridges on a concrete floor


grinder with a carborundum (sp?) cup stone to take off the high spots first.
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Old 02-05-2010, 12:01 PM   #9
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ridges on a concrete floor


If I do use a floor grinder, will it eat quickly into the floor and possibly cause pits or will it slowly grind material away?
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Old 02-05-2010, 01:14 PM   #10
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ridges on a concrete floor


Also, I have 2 options to rent. A 7" hand-held grinder or a 22" floor buffer style grinder. Which should I get? Also, how do I grind next to walls and in tight spaces?
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Old 02-05-2010, 05:19 PM   #11
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Any ideas? I'm really lost on this one and really need the help. Thanks.

Blake
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Old 02-06-2010, 07:26 AM   #12
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ridges on a concrete floor


we use several things - oscillating floor sander - 4 & 7" diamond cup wheels on hand grinders - swing buffers w/screens &/or diamond pads - walk-behind 2-head'd grinders - depends on the ridges - topping was the correct mtl, not underlayment - my advice is grind it all of & begin anew,,, diy projects aren't necessarily as easy as the literature - dvd's - brochures - w-sites but this is how you learn,,, fairly difficult to gain critical experience & knowledge when everything goes ' RIGHT ' especially when the goal requires 'em
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Old 03-25-2010, 01:59 PM   #13
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ridges on a concrete floor


Been doing epoxy garage floors since 2004.

You will need to grind the floor smooth with a diamond grinding wheel. Be careful, though, it is all too easy to leave grinder swirl marks in the surface.

ALSO, don't scrimp. It is absolutely necessary to get a grinder with an attached vacuum to suck up the concrete dust. It is nasty stuff you don't want to be breathing. I'd also wear a dust mask.

The epoxy and decorative chips hide lots of sins when the chips are applied at 100% coverage but they don't hide everything.

Patrick Dowd
California Concrete Restoration
http://www.squidoo.com/epoxygaragefloors

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