How to Overlap Rebar


Rebar is a common component found in concrete slabs. It serves as a foundation or paving where there is a need of additional reinforcement of the concrete. Placed in a layer in the center of a slab, rebar is a series of steel bars that overlap each other to form a grid held in place by the concrete as it hardens. The bars help to distribute weight placed onto the concrete's surface and allow the concrete to carry a greater load than it would if not reinforced. Though the hardened concrete keeps the rebar steady, you will need to secure the rods prior to pouring the concrete so that an even distribution is maintained throughout the stone.

Things You'll Need

  • Measuring tape
  • Concrete support stones
  • Steel rebar
  • Metal ties
  • Pliers
  • Measure the length, width and height of the excavated hole dug for your concrete slab. Cut rebar 10 inches shorter than the measured length and width of the site to prevent the bars from extending to the edges of the concrete. Any rebar exposed to the elements due to length will rust within the stone.

  • Lay concrete rebar support stones every 5 feet in the base of the hole to hold the rebar at the proper height in the concrete.

  • Lay the rebar, spaced every 2 feet, on top of the stones. Run the rebar along the width of the foundation hole, and then place rods along the length of the hole, overlapping the first layer of bars to form the grid.

  • Connect the overlapping rebar at the points they cross by tying metal ties around the cross-sections. Tighten them in place with a pair of pliers by twisting the tie ends together. After tightening the entire grid, pour the concrete.

Tips & Warnings

  • Have the supplier cut the rebar to length to save time on the building site.

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