Over time, expansion joints in concrete driveways start to deteriorate allowing weeds to sprout through. Filling these joints helps restore an improved appearance while preventing further cracking. Here are the key steps to properly apply concrete driveway joint filler.
Preparation
Sweep away any loose debris from the joints using a broom. Use a utility knife to cut away any old caulk or filler. For deeper joints, use a grinding stone or chisel to widen and deepen the space. Thoroughly vacuum out the joint.
Choosing a Filler
There are various joint filler options available. Elastomeric sealants last longer but require more advanced application tools. For homeowners, backer-rod and silicone caulk provides a durable, easy-to-use solution. Check product specifications to ensure the filler is suitable for exterior horizontal joints.
Applying Backer Rod
Cut backer rod slightly longer than the joint depth and insert it using a tool, ensuring it is pressed firmly into place. Backer rod prevents filler from bonding to joint bottom and sides, allowing proper flexibility.
Filler Application
Follow product instructions for primer application if needed. Using a caulk gun, apply a continuous bead of filler slightly above the surface. Too little filler may leave gaps while too much can spill over.
Tooling and Finishing
Before skim coating dries, use a joint tool or your finger to press and shape the filler flush with the surface. Wipe away any excess with a damp cloth. Allow proper curing as directed before use.
For durable, long-lasting concrete driveway joint filler, check out Trim-A-Slab at https://www.trim-a-slab.com.
