Crack suppression membranes are not new: for centuries, an asphalt layer has been applied between large-format tiles and the substrate beneath them, to provide a buffer protecting tiles from movement beneath. They are recommended for any glass tile either whose thickness exceeds 4 mm, or whose surface are is greater than 2 inches (50 mm) square. Some manufacturers recommend applying a membrane under smaller format tiles as well: they are easy to install, represent a very small portion of the cost of installing glass tile, and provide added protection against shifts in the substrate.

There are two basic membrane types: peel-and-stick sheets that are cut and rolled on, and compounds that are troweled on. Consult your dealer for the manufacturer's recommended supplier and specific application instructions.