MATERIALS • Metal snips
• Chicken wire
• 23-inch-diameter plastic bowl • Hot-glue gun + glue stick
• 1½-inch diameter by 3-inch PVC pipe • Vegetable oil spray
• 18-inch-diameter plastic bowl
• 5-gallon bucket
• 50-pound bag fast-setting concrete mix • Bricks
• Sheet plastic
• Metal file
• Play sand
• 13½-inch grill grate
Step 1 Use metal snips to cut a 2×2-foot square of chicken wire. Press and fit the chicken wire inside the large bowl. Trim excess wire. Set aside the wire bowl, which will be used to reinforce the concrete fire bowl when it is formed.
Step 2 Hot-glue the pipe to the inside center of the large bowl, to create a drainage hole when molding the fire bowl. Spray vegetable oil on the inside of the large bowl and outside of the small bowl (A).
Step 3 Mix concrete in a 5-gallon bucket according to the package directions. Press prepared concrete 1 inch thick in the bottom of the large bowl. Press the chicken wire bowl into the concrete, then add another inch of concrete to embed and hold the wire in place (B).
Step 4 Set the smaller bowl on the concrete and fill the bowl with bricks or rocks to hold it in place (C). Add remaining prepared concrete to fill the sides of the large mold to its top edge. Press and rotate the small mold every few minutes to release it from the concrete. When the concrete begins to set and hold its shape, remove the bricks, small mold, and pipe.
Step 5 Cover the large mold with a sheet of plastic. Allow the concrete to set for 24 hours, then carefully turn the mold over and remove (D). Wrap the concrete bowl in sheet plastic and allow it to cure for one week; unwrap. Use a metal file to smooth the bowl’s top edge. Before using the fire bowl, fill the bottom one-third of it with sand and set the grill grate on the sand.