A concrete expansion joint is a material placed in the joints (or cracks) between slabs to protect them from cracking as they expand and contract due to temperature changes. Expansion joints also act as a shock-absorbing material, helping you absorb the stress caused by the slab’s movement. However, after some time, your concrete expansion joints may dry out and be unable to absorb this stress as well as they used to. You will notice that cracks begin to develop in the concrete. If you see this, it is time for you to replace your concrete expansion joints.

To make expansion joint concrete repairs, you must follow these instructions carefully:

Start by sweeping away any debris or dirt from the area.

Dig to remove any old material inside the joints using a putty knife. You can also flush out any hard-to-reach debris using a hose.

Using a wet-dry vacuum, clean the joints between the slabs thoroughly.

Apply your bonding adhesive into the joints using a brush. Allow the glue to dry for 10 –15 minutes. Ensure you don’t leave the adhesive for too long since it needs to be sticky, not dry. It should help your new material bond to the concrete efficiently.




Insert a foam backer rod to act as your new shock absorber. Measure the total amount of rod you need and cut a piece that fits. Push the strip down into the joint using a putty knife.

Cover and seal your joint. Apply a thick layer of self-levelling urethane sealant. We recommend you wear safety gloves and goggles when working with urethane sealants.

Block any area, so no one walks on your newly placed joints until the sealant has completely dried out.

However, if you don’t have enough time, experience, or training to make such concrete repairs, we suggest you always hire professionals to do the job for you. Professional experts will know how to fix your issue and ensure you get long-lasting results.