During construction, it’s vital two design the joint spacing and placement properly. This way, it will allow the expansion joint to be effective, protecting the concrete slabs from cracking over time. With that said, here are some important placement tips for an ideal concrete expansion joint.
- Place a Joint After Every 10 Feet
When the concrete slabs are being placed, you will need to create joints (cracks) to allow the expansion joints to set. Thus, keep the joints about every 10 feet of concrete. Do not exceed 15 feet.
- Keep the Joints Deep Enough for Maximum Shock Absorbance
Make sure that the depth of the joints is one-quarter of the thickness of the slab at a minimum. The longer, the better shock absorbance it will provide.
- Use Joint Spacing
It’s best to use joint spacing so that you can have concrete slabs that are approximately square. The even concrete slabs will make it easier to cut expansion joints to fit into the spaces.
- Remove Wire Mesh on Contraction Joints
Some slabs may contain wire mesh. In that case, remove the wire mesh only on contraction joints.
- Plan All Joint Cutting
Mark the joints’ locations before you start cutting. This way, you can make the concrete slabs even, which will also look great.
- Do the Dry-Cutting at the Right Time
Begin dry-cutting every joint about 1 to 4 hours after the finishing is complete.
After following these tips, you can ensure that each concrete expansion joint will be well-placed and correctly installed.