- 1). Prepare the slab's location. A concrete slab must rest on a stable surface to avoid cracking in the future. Ideally, remove all soil with organic content (topsoil) and replace it with a well compacted, non-organic fill. This base should be at least 4 to 12 inches thick, with the last 2 to 3 inches being gravel for drainage. The base is compacted by adding a few inches of dirt and compacting it with a vibrating plate tamper. Add a few more inches and tamp. Repeat this step until you reach the appropriate grade.
- 2). Build the concrete form with stakes and 2-by-6 wood. Lay out the 2-by-6's in the pattern you desire for the floor space and drive stakes into the ground beside the wood. Attach the wood to the stakes so you have a supported box on the ground. Use a level to ensure the frame is level and measure the distance between the opposing corners to make sure the box is square. Both measurements must be equal if you desire a floor with 90 degree corners.
- 3). Install wire mesh across the entire floor. Raise it off the ground 2 inches by using supports and tie wire. This will add needed strength to the concrete.
- 4). Mix and pour concrete into the form until it has reached the top of the 6-inch boards. Use a spare board to roughly level the concrete.
- 5). Smooth the concrete with a trowel. Use the trowel in a circular motion and allow to dry for a few hours. Trowel again for a smoother surface.
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