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.
Vapor barrier shower walls tile.
Moisture barriers stop that.
Run the height of the vapor barrier from the top all the way down into the shower pan make sure not cut too short before the water barrier.
Use appropriate tape to adhere two pieces of vapor barrier and edges to avoid moisture entry to the back walls.
Steam stays in a gas form until it cools down or hits a barrier such as a shower door tile ceiling or a mirror.
Before tile can be installed on shower walls a moisture barrier must be secured so that any water that penetrates through the tile and grout does not get all the way through to the wooden wall.
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.
In a shower situation you recognize it as steam.
Water vapor is water in a gas form.