Do I need a crack isolation membrane?

Do I need a crack isolation membrane?

https://www.youtube.com/watch?v=dRDe5onxNZA

What does crack isolation mean?

On concrete floors, crack isolation membranes, also known as crack I products, are designed to absorb the stresses produced by movement in the concrete. The purpose of the membrane is to stretch with the movement of the concrete, but not allow this movement to telegraph to the face of the tile or grout joint.Jul 1, 2016

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