A vapor or moisture barrier is a layer of protection that is designed to act as a waterproof shield helping to keep condensation away from wood insulation and other mold prone materials that are located behind the drywall.
Wall tile vapor barrier.
It s usually a thin layer of plastic that sits between the drywall and the studs.
A vapor barrier can be applied or installed over the tile substrate using a liquid or sheet membrane.
There is a clear advantage of using a liquid membrane it is relatively easy to apply over the tile substrate along with the use of a fiber mesh tape you can secure joints and changes of plane.
Nance carpet and rug versapad 180 sq.
Over time this will present itself as unhealthy mold and rot.