How to Replace the Wooden Joints in the Driveway

Installing concrete expansion joints during a pour is one of the most effective ways to prevent a slab from developing unsightly cracks. Pressure-treated wood joints can rot over time, which leaves the joints and foundation beneath vulnerable to water damage. Do-it-yourselfers should replace damaged joints immediately to prevent the problem from spreading. This is a straightforward task you can do in a few hours with basic materials.

Hammer
Cold chisel
Metal scraper
Wire brush
Foam backer rod
Utility knife
Wood
Mallet
Expansion joint sealer
Caulking gun
Putty knife
Gloves

Instructions

- 1
  Chisel out the damaged wooden joints with a hammer and cold chisel. Hold it at an angle and continue to pry pieces loose until the joint is empty. Go over the sides with a metal scraper to chip off any old caulk. Brush out the debris with a wire brush.
- 2
  Cut a length of foam backer rod to fit the expanse with a sharpened utility knife. The dense material absorbs tension from the slabs, and it’s more durable than wood.
- 3
  Press the backer rod into the joint with your hands. Hold a blunt piece of wood over the backer rod and hit it with the mallet to push it all the way to the bottom of the joint. When you’re finished, the top should sit 1/2 inch from the surface of the concrete.
- 4
  Attach a tube of expansion-joint sealer to a caulking gun. Start at one end of the joint and fill the remaining expanse of the joint with sealer. Smooth the top with the end of a putty knife. Run a gloved finger along the edges so it doesn’t stain the concrete.

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