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Leveling A Concrete Garage Slab

 
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Old 08-11-2019, 05:53 PM   #1
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Leveling A Concrete Garage Slab


We are involved with a project and part of what we're doing is going to require the existing garage slab to be made level. It is currently sloped .25:12 towards the big door. It has a stem wall so it's already formed on the perimeter.

We are thinking of using pumped concrete to about 2" and stopping it there and then using a self leveling underlayment of some sort from there, planning on using concrete glue for the top of the slab for that part.

If we go from 0" to 2" thick it will be about 15-17 cu. ft.. We're thinking of using something like SikaLevel, have used Sika products before with good results but wanted to see if anyone has another product that is better and to go over pros and cons of what the plan is.

It's in San Diego city so it's very temperate. The space will be conditioned but even if it wasn't there is no freeze/thaw cycle to be concerned with, the highs rarely get above 90 and never get to freezing, it's usually around 70 degrees.

Thanks for reviewing and comments!
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Old 08-11-2019, 06:42 PM   #2
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Re: Leveling A Concrete Garage Slab


Gyp crete/ fireproofing, contractor, add some Portland for a little more strength?

Al the wood multistory apartments use the G-Crete ask a fire floor/noise barrier, every other floor vertically, two inches + over the 3/4" OSD T & G....

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Old 08-11-2019, 11:15 PM   #3
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Re: Leveling A Concrete Garage Slab


HI Rio, forget the self-leveler, just go with pea gravel in the mix and really tamp it so a a thick layer of cream comes to the top.

They may want 6 mil. visqueen on the existing garage slab as there was probably no VB in the initial pour for the garage slab. It will dry slow but strong.

It will have to be about 1" thick minimum though.

Andy.
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Old 08-12-2019, 12:11 PM   #4
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Re: Leveling A Concrete Garage Slab


Mud jack it?
Or use spray foam to jack it up on the low end.
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Old 08-12-2019, 02:10 PM   #5
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Re: Leveling A Concrete Garage Slab


Hi Scipio, it's going to be 6 sack pea gravel so 3,000 psi, guess we could go less than 2" but I'm skeptical about long term stability at 1" and would like to take it down to about 1/4" or so for threshold purposes; did think about a vapor barrier and like the idea but I think that once it's getting down to the thin end it would be accentuating the cold joint, they'll just have to go with tile on the floor and area rugs.

Regarding mudjacking it's a monolithic slab on grade with a continuous footing so that's not an option.

Contractor wants to use a product called Levellite, never heard of it, need to check it out.............
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Old 08-12-2019, 11:19 PM   #6
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Re: Leveling A Concrete Garage Slab


I've done this with great success. Did it like Andy said. We made the garage into a room and built them another garage. We used 6 mil as well. It came out great. However I think our thinnest area was 3" thick. I'd have no problem doing it again in a heartbeat. Remember it's not really structural it's just a fill so to speak.

We pushed around all kinds of ideas. Those in hindsight seemed to be Overthinking it. Imo


Mike.
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Old 08-13-2019, 12:35 AM   #7
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Re: Leveling A Concrete Garage Slab


Yeah, I like Andy's suggestions, good advice all the way around, especially the tamping till the cream rises and the vapor barrier; thinking now maybe 6 mil up to 2" and then nothing from there on, the half loaf is better than none theory.

I was reading up on the levelLite and it looks like it's good stuff, has a bunch of ASTM compliance statements on the cut sheets, I'm attaching them in case anyone wants to take a gander.
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