- 1). Arrange a series of concrete support stones along the bottom of the foundation excavation. Concrete support stones are square concrete stones of a uniform height that support the rebar at the necessary height while the concrete is poured. Choose stones that are half the height of the planned slab. Place a stone every five feet in the excavation.
- 2). Place the rebar rods into the foundation atop the support stones. The grid should be placed with a bar spaded every two feet, starting two to five inches from the edge of the planned slab. Place a single layer of parallel bars, and then place the second layer of bars perpendicular to the first.
- 3). Place metal ties around the crossing points of the two layers of rebar to create a single grid. Twist the metal ties around the crossing bars using a pair of pliers.
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