How to Fill Cinder Blocks

Cinder blocks are ideal for constructing foundations and walls since they are larger than standard bricks, allowing you to build them up quickly. They also have holes that can be reinforced with rebar, metal reinforcing bars and filled with concrete to add strength, insulation and long-lasting durability to your foundation, wall or other cinder block project. Like bricks, you can choose from a number of sizes, shapes, textures and colors to customize your job.

Dry, premixed concrete
Cinder blocks
Wheelbarrow
Trowel
Rebar
Hydraulic bolt cutter
Hammer
Knife
Shovel

Instructions

- 1
  Determine how much concrete you will need to do your job using an online calculator (see Resources).
- 2
  Place your cinder blocks into position with the holes facing up and down.
- 3
  Cut the rebar to the proper height, if necessary, using the hydraulic bolt cutter. Position the rebar in each block's hole, driving them approximately 2 inches into the ground. Look at the rebars to make sure they are straight. If not, reposition them so they are.
- 4
  Cut open a bag of concrete mix with a knife and dump it into your wheelbarrow. Slowly add ¾ gallon of water. Thoroughly mix the concrete with a shovel. Add more water and mix it in. Scrape to the bottom of the wheelbarrow and continue to mix the concrete until no dry mix remains. You should achieve a clay-like consistency with your final mix.
- 5
  Shovel the concrete into the cinder block's holes. Compact the concrete with a trowel.

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