How to Replace Expansion Joints

Replacing expansion joints in concrete driveways and patios is necessary to maintain a barrier between the slabs and prevent the concrete from cracking. Wood and fiber expansion joints can wear out and rot over time, breaking down the cushioning between the concrete slabs. Maintaining the expansion joints will keep the concrete slabs from breaking up and help to retain a professional appearance in your walkways.

Things You'll Need

• Putty knife
• Broom
• Foam backer rod
• Self-leveling urethane sealant
• Safety goggles
• Rubber gloves

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Instructions

1. • 1

     Remove old debris or pieces of wood from inside the concrete expansion joints with a putty knife. Clean out the joints with a broom.

   • 2

     Insert a new foam backer rod into the expansion joints, using the putty knife.

   • 3

     Fill in the joints with self-leveling urethane sealant. Wear safety goggles and rubber gloves when applying the sealant.