A vapor barrier can be applied or installed over the tile substrate using a liquid or sheet membrane.
Wall tile vapor barrier.
It s usually a thin layer of plastic that sits between the drywall and the studs.
Steam stays in a gas form until it cools down or hits a barrier such as a shower door tile ceiling or a mirror.
Water vapor that gets behind walls or travels up through light fixtures or hvac grilles into an attic will turn back into water when it cools off.
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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.