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Old 08-25-2011, 05:54 PM   #1
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too much slope on slab foundation site


I am still in the early planning stage, haven't talked to grader yet. But am planning on building a 32' x 36' shop on a slab foundation. The place where I want to locate has a bit of fall from high point to low point (haven't pulled a string and level out but is probaly 3'). Then of course the build-up around outside of low corners where it continues to slope down... Is there a limit on how much is too much fall or is a just a matter of moving alot more dirt? thanks

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Old 08-26-2011, 03:04 AM   #2
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too much slope on slab foundation site


"Is there a limit on how much is too much fall or is a just a matter of moving alot more dirt?" I don't understand the question. Dig a flat spot, so you pour on undisturbed dirt, not compacted dirt (fill). Compact gravel under the slab, of course. 3 feet? Hell, I just dug down 25' and had to move over 6,000 yards of dirt for my house area. You're flat!

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Old 08-26-2011, 09:33 AM   #3
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too much slope on slab foundation site


Quote:
Originally Posted by jklingel View Post
"Is there a limit on how much is too much fall or is a just a matter of moving alot more dirt?" I don't understand the question. Dig a flat spot, so you pour on undisturbed dirt, not compacted dirt (fill). Compact gravel under the slab, of course. 3 feet? Hell, I just dug down 25' and had to move over 6,000 yards of dirt for my house area. You're flat!
The high side will be 3' below grade (underground).
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Old 08-26-2011, 11:53 AM   #4
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too much slope on slab foundation site


If you are trying to use a monolithic slab, you'll needed to escavate a level area and provide for drainage. When you put put a sting and level on it you will probably find it's more unlevel than you think...
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Old 08-26-2011, 12:09 PM   #5
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too much slope on slab foundation site


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Originally Posted by ugabulldog View Post
The high side will be 3' below grade (underground).
You can handle it a few ways.
1. You will build a block wall above grade. then waterprroof the block on the outside.
Or
2. Dig back a few feet and build a retaining wall into the hill, keeping the soil away from the structure.
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