After extensive testing, Custom found that using FlexBond, a premium mortar with maximum flexibility and bond strength, over USG Levelrock line of lightweight concrete products helps prevent tiles from cracking due to minor surface movement. FlexBond is a technologically advanced flexible mortar that is twice as strong as industry standards, and is the best choice for tiling over challenging surfaces such as plywood, ceramic tile and now, USG Levelrock lightweight concrete.
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