Finish TradesQuestion 226 of 700
An uncoupling (crack-isolation) membrane is installed between a concrete slab and ceramic tile. Its PRIMARY purpose is to:
a.Allow minor in-plane movement of the slab without transferring cracks to the tile
b.Add structural load capacity to the slab
c.Replace the need for any thinset mortar
d.Serve as the finished wearing surface
Explanation
An uncoupling membrane separates the tile layer from slab movement so shrinkage or small cracks in the concrete are not telegraphed up through the tile and grout. It does not add structural capacity, still requires thinset above and below, and is a hidden layer, not the wear surface.
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