What is the purpose of an expansion joint?

The purpose of an expansion joint is to engineer a controlled crack in the epoxy grout to reduce the possibility of random cracking, when machinery to grout temperature differentials of 50°F are encountered.

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What type of material should I use to fill an expansion joint.

You can fill an expansion joint with silicone caulk, however it is recommended to use an elastic epoxy seam sealant after the grout is fully cured, such as Chockfast Expansion Joint material.

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