It s usually a thin layer of plastic that sits between the drywall and the studs.
Vapor barrier shower walls tile.
Steam stays in a gas form until it cools down or hits a barrier such as a shower door tile ceiling or a mirror.
A seam in an acrylic shower or a cracked grout joint or some missing caulk in a tile shower are all that is needed to let moisture get behind your shower enclosure.
Water vapor is water in a gas form.
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.
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.
In a shower situation you recognize it as steam.
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.