Expansion Joint
Planned gaps in concrete that allow for thermal expansion and contraction without random cracking.
Why It Matters for Homeowners
Why it matters: concrete expands and contracts with temperature changes, and expansion joints are the planned cracks that prevent unplanned ones. They are typically tooled in every 8-10 feet on driveways and patios. Skipping them does not save money, it just guarantees random cracking within the first year or two. Joint sealant in the gap prevents water and debris from getting under the slab and accelerating failure.
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