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DIY Concrete Mold Making

Making a concrete mold is a technique called casting that requires the use of a form. The form to use is constructed in the shape of the mold. This can be a concrete fountain or a centerpiece for a patio. To do this you will require rigid foam insulation. The tools and materials you will need for this project can be found at your local home improvement store.

Things You'll Need

1-inch rigid foam insulation
Tape measure
Felt tip marker
Straight edge
Circular saw
Green or blue painters tape
Power drill
Screw
Crack resistant concrete
1-by-2 board

Instructions

- 1
  Measure the rigid foam insulation and make four marks at six inches with the felt tip marker. Place the straight edge on each mark and draw cut line. Cut four 4-foot pieces with the circular saw.
- 2
  Measure and cut four 1-inch strips from the rigid foam insulation. Cut a 6-by-6-inch square out of the rigid insulation. This will be the base.
- 3
  Assemble the four cut pieces of rigid foam insulation to form a column. The center of the column needs to measure 5-by-5 inches. Secure the pieces of rigid foam insulation with a green or blue painter's tape.
- 4
  Assemble the four 1-inch pieces to from a 2-by-2-inch column. Secure the pieces together with the painter's tape.
- 5
  Set the 2-by-2-inch column in the center of the 6-inch square piece of rigid foam insulation. Drill a pilot hole through the insulation and into the 1-inch pieces with the power drill. Secure the pieces using a screw.
- 6
  Set the column and base upright. Place the 5-by-5-inch column onto the base. Secure the pieces by using screws.
- 7
  Mix the crack resistant concrete in a bucket. Fill the form with the concrete at 6-inch intervals. You will need to tamp the concrete with a 1-by-2 board as you fill the form to give it a smooth surface.
- 8
  Allow the concrete to cure for three to four days and then remove the form.

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