How to Make a Mold for a Concrete Fire Ring

A fire pit can add aesthetic value to your outdoor living space, and can provide a source of heat when you are relaxing outside during the cooler months. You can also use a fire pit for roasting campfire fare such as hot dogs and marshmallows. A concrete fire pit ring provides a low-maintenance barrier to contain fire and help prevent injuries from burns. Constructing a concrete fire pit ring is a relatively straightforward task that you can complete in a weekend.

Measuring tape
Bender board
Jigsaw
Nails
Hammer
Wood stakes
Carpenter's level

Instructions

- 1
  Determine the diameter and thickness of the fire pit ring with a measuring tape. The ring should be at least 5 inches thick for optimal stability and safety.
- 2
  Cut a section of bender board to the outer circumference of the fire pit ring, plus an additional 4 inches, with a jigsaw. You can determine the outer circumference by multiplying half the diameter by 3.1416, then multiplying the result by itself. Cut an additional section of bender board to the inner circumference of the ring, plus an additional 4 inches, using the inner diameter to calculate the circumference.
- 3
  Bend the outer and inner bender board sections into circles, and overlap the ends by 4 inches. Drive nails through the overlapped sections of the bender board, using a hammer, to secure the forms.
- 4
  Center the inner form inside of the outer form in the desired location of the fire pit. Drive wood stakes into the ground with a hammer along the outside of the outer form, and along the inside of the inner form. The stakes hold the two circles of bender board in place when you pour concrete in the space between them.

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