Do I Need a Decoupling Membrane?

If tile is laid directly on top of concrete, this expansion and contraction will cause stresses that fracture or delaminate the tile. ... Other less common and more challenging substrates like asphalt and metal require an uncoupling membrane to ensure the tile will adhere to these surfaces.

Do you need uncoupling membrane over concrete?

Uncoupling membranes are invaluable if you anticipate any movement or cracking from the concrete floor. Generally, it is well worth the cost and the time to purchase and install an uncoupling membrane. Uncoupling membranes are not perfect, though.

When would you use an uncoupling membrane?

Uncoupling membranes are usually used to uncouple the tiling layer from the substrate and thus reduce the stresses built up between substrate and tile. They can also offer waterproofing and channels for evaporation or heat exchange.