Expansion joints keep your concrete slabs from cracking when they contract and expand due to temperature changes. The material takes on the stress from the movement of the slab, serving as a shock absorber to prevent damage to other structures. A sidewalk caulk expansion joint doesn’t last forever, though. Over time, the material dries out, reducing its effectiveness in absorbing the stress. When you start seeing cracks appear in the slabs, that means you need to start shopping for a replacement. If you want to install the replacement joint yourself, follow these steps.
Clear the clutter
Sweep the area clean of any dirt and debris before you start. Keep your tools handy and accessible.
Remove the old joints
Once the area is clean, start digging out the old material in the joints. A putty knife will do the job. If it’s hard to get rid of the debris, try flushing them out with a hose.
Clean the joints
If you used the hose, go over the joints with a wet-dry vacuum. Make sure the joints between the slabs are clean of any dirt and materials.
Apply the adhesive
Using a brush, put epoxy into the joints to help the new material bond to the old concrete. Wait for about 10 to 15 minutes while keeping an eye on the epoxy. Don’t let it dry completely.
Insert the rod
While the epoxy is still sticky, insert the foam backer rod into the joint. This will serve as the new shock absorber. Be sure to cut it at the right size, so measure the backer rod you need. Use a putty knife to push the strip into the joint and make sure it’s all the way in.
Cover and seal the joint
Apply a layer of self-leveling urethane sealant to cover and seal the joint. Wear safety goggles when you do so. Block off the area to give the sealant a chance to dry.
To learn more about sidewalk caulk expansion joint, visit Trim-A-Slab.com