Moisture barriers stop that.
Vapor barrier shower walls tile.
It s usually a thin layer of plastic that sits between the drywall and the studs.
Water vapor is water in a gas form.
Use a minimal amount of staples to secure the vapor barrier to the walls studs.
Use appropriate tape to adhere two pieces of vapor barrier and edges to avoid moisture entry to the back walls.
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.
Steam stays in a gas form until it cools down or hits a barrier such as a shower door tile ceiling or a mirror.
In a shower situation you recognize it as steam.
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.