How to Add a Concrete Perimeter to a Post and Pier

Remove soil between the piers 16 inches deep and 16 inches wide. Loosen the soil with a pickax. Remove the soil with a square shovel. Place a 4-foot level in the bottom of the footer trench to level the footer.

Lay two pieces of rebar in the bottom of the footer. Place the rebar on concrete bricks to raise it off the floor of the footer.

Drill four 3/8-inch holes into the sides of the piers where the piers face each other. Place a 1/2-inch rebar that is eight inches long onto the holes. These rebar ties the concrete perimeter to the concrete piers.

Place 3/4-inch plywood on the front and back sides of the piers, enclosing the spaces between the piers. Drill 1/4-inch holes into the concrete piers with the concrete drill bit and hammer drill. Attach plywood to the front and back of the piers with 3/16-inch concrete screws.

Drill a 3-inch hole at the top of each piece of plywood on the outside of the piers. Pump concrete into the holes with a concrete pump truck. Fill the space between the piers with concrete. Tap the sides of the plywood with a hammer to remove bubbles and to settle the concrete gravel. Allow the concrete to set for 24 hours, and remove the plywood.