Lawn and Garden

Concrete Curb Edging

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Concrete Curb Edging

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BLACK+DECKER B+D Contributor 120 Projects

Poured concrete edging is perfect for curves and custom shapes, especially when you want a continuous border at a consistent height. Keeping the edging low to the ground (about one inch above grade) makes it work well as a mowing strip, in addition to a patio or walkway border. Use fiber-reinforced concrete mix, and cut control joints into the edging to help control cracking.

How to Install Concrete Curb Edging

  1. Lay out the contours of the edging using a rope or garden hose. For straight runs, use stakes and mason’s string to mark the layout. Make the curb at least 5" wide.

  2. Dig a trench between the layout lines 8" wide (or 3" wider than the finished curb width) at a depth that allows for a 4"-thick (minimum) curb at the desired height above grade. Compact the soil to form a flat, solid base.

  3. Stake along the edges of the trench, using 1 x 1 x 12" wood stakes. Drive a stake every 18" along each side edge.

  4. Build the form sides by fastening 4"-wide strips of 1/4" hardboard to the insides of the stakes using 1" wood screws. Bend the strips to follow the desired contours.

  5. Add spacers inside the form to maintain a consistent width. Cut the spacers from 1 x 1 to fit snugly inside the form. Set the spacers along the bottom edges of the form at 3-ft. intervals.

  6. Fill the form with concrete mixed to a firm, workable consistency. Use a margin trowel to spread and consolidate the concrete.

  7. Tool the concrete: once the bleed water disappears, smooth the surface with a wood float. Using a margin trowel, cut 1"-deep control joints across the width of the curb at 3-ft. intervals.

  8. Tool the side edges of the curb with an edger. Allow to cure.

  9. Seal the concrete, as directed, with an acrylic concrete sealer, and let it cure for 3 to 5 days before removing the form.