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Concrete Pad on Grass

Concrete Pad on Grass

Concrete Pad on Grass

(OP)
Hi,

Recently I got 11'X11' concrete pad built in my backyard. Some contractor in my neighborhood was working and I got him to build this pad for me. He built it while I was away at work. Later when I checked my security cameras, I saw that he built it on top of grass without digging the grass out. He poured gravels on top of grass then compacted them and then poured about 5" concrete on top of it. I have never heard of anyone doing it this way. Should I be concerned?

RE: Concrete Pad on Grass

Depends on what you are putting on the slab I would think.

RE: Concrete Pad on Grass

(OP)
I am planning on building 10 X 10 storage shed on it.

RE: Concrete Pad on Grass

Since the slab is 5" thick, it's likely strong enough, so the question becomes, is the likely inch or so of settlement going to be a problem.

RE: Concrete Pad on Grass

A 10x10 residential use shed is likely to carry a very light load compared to some of the projects we see in the commercial/industrial world. However, if one of us were building it in our yard, we would have a 12-inch thick slab with #8 bars every 6 inches "just to make sure."

RE: Concrete Pad on Grass

TigerGuy,

Not me. I have done exactly as the OP's contractor did.

RE: Concrete Pad on Grass

For a storage shed slab, I'd most likely do a 4" unreinforced slab, or 3" reinforced with mesh on a compacted base of crushed rock. 6" around the edges to embed anchors for the wall. I calculate what's needed, so I can be sure without wasting money.

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