Existing expansion joints
Q. How do I keep the existing expansion joints in the concrete floor from cracking up through my stampable overlay?
A. You must always honor existing expansion joints in concrete when doing concrete overlays and concrete coatings.
Whether it's a concrete floor, concrete pool deck, concrete patio or concrete driveway, the expansion joints are there to allow the concrete to expand and contract.
If you try to cover up the expansion joint with the concrete overlay product there is a very good chance the joint will mirror up through the overlay and look like a crack.
It's important to make the customer aware of this when selling the concrete overlay and explain why the expansion joints are there in the first place.
Mark out where the expansion joints are and re-cut them after the concrete overlay has hardened.
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