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Old 12-07-2012, 10:09 AM   #1
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Small Wood Shop on Grade


Hi all. I am finishing a garage area wherein the concrete floor is graded for drainage at an angle of about 6'' over a 20' run. I'd like to level this floor. My proposed method for doing so is to apply a vapor barrier, followed by joists or sleepers ripped at an angle commensurate with the floor angle so that one end would be six inches higher than the other creating a level surface, then a ply sub-floor. Anybody ever try this or have an opinion on my plan? Also curious if you would allow the sleepers to float or anchor them to the concrete floor to prevent slipping. Thanks. -Aaron


Last edited by St. A; 12-07-2012 at 10:59 AM.
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Old 12-08-2012, 09:27 PM   #2
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Small Wood Shop on Grade


Have you talked w/ any concrete places to see about just pouring a new floor over this one? ANY wood on concrete needs a capillary break, so I'd be leery of your plan w/out addressing that.

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Old 12-08-2012, 10:38 PM   #3
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Small Wood Shop on Grade


You need to share a bit more.

Why would you want to level a floor designed to drain so steeply?

Six inches over twenty feet, to one corner or one side, was not a casual decision. Is the house on a slab foundation? It all is leaning or sinking toward a corner?

What are you trying to do with this garage space?

Isn't the current poured floor near the level of the first entry to the living space?

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Old 12-28-2012, 10:09 AM   #4
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The house is in Florida, quite near the beach, and this house was essentially built on stilts (really filled concrete block pillars). The space below was graded presumably for easy drainage as a carport or garage. Half the lower floor was closed in before I bought the house, but it is not connected to the living area upstairs, so you have to go outside, walk down exterior stairs to get to that downstairs living area or to get to my laundry. I want to close in the other half of the downstairs to add an interior stair to make the house a cohesive whole. Another option, and perhaps a better one, as eluded to in post #2, would be to drill some holes in the concrete floor, add rebar, and simply pour new concrete atop the existing floor to level. I like the idea of this as I want to tile down there anyway and this would be a fine subfloor for tile, I'm just leery of adding new concrete to old. The floor is in beautiful shape, no cracks, perfectly smooth- just too steeply graded for a living area. Thanks- Aaron
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Old 12-28-2012, 11:42 AM   #5
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I just checked the grade to confirm my numbers and I was a bit off. The dimensions of the area to be regraded are 18'x14' with a grade of 7 1/2'' over the 18' run. By my calculations, (and they could be wrong), that's about 3 yards of concrete.
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Old 12-28-2012, 07:18 PM   #6
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Originally Posted by St. A View Post
I just checked the grade to confirm my numbers and I was a bit off. The dimensions of the area to be regraded are 18'x14' with a grade of 7 1/2'' over the 18' run. By my calculations, (and they could be wrong), that's about 3 yards of concrete.
Ayuh,.... How thick are ya talkin' to get to 3 yards,..??
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Old 12-28-2012, 07:46 PM   #7
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I got that by multiplying length times width times depth. In this case I multiplied 14' x 18' x 7.5 / 12 (to get to ft.) / 2 (to account for the slope which is the shape of a right triangle) / 27 (to get to cu. yards) and came up with 3. That's 7 1/2'' at it's deepest to 0'' at the other end where it will meet level concrete. I've never done this before, did I do it incorrectly?
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Old 12-29-2012, 07:26 AM   #8
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That's 7 1/2'' at it's deepest to 0'' at the other end where it will meet level concrete. I've never done this before, did I do it incorrectly?
Ayuh,.... Where ya feather the new concrete to 0", there'll always be an eroding edge, due to the thinnest of the concrete....

You'd need to raise the entire area, so the areas now figured at 0", has atleast 2" of concrete....
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Old 12-29-2012, 10:17 AM   #9
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Thanks Bondo. Can you get away with the feather edge (not raising all levels), if you put thinset and tile over the entire area after the concrete cures so the edge is unexposed? Thanks- Aaron
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Old 12-29-2012, 04:18 PM   #10
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Quite probably you are in a hurricane/flood plane area and as such are not allowed by code to have any form of living space below the flood line.
Just saying...

Andy.

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