To Install Concrete Walling in a Shower, you have to Measure the width of your shower walls and transfer those measurements to your sheets of concrete board. You need to Order sheets according to the size of your shower. If possible, you must install full sheets. After that, Cut the pieces of concrete board as required with a utility knife. You should Mark the top and bottom edge of a piece with the tape measure and pencil.
You can snap a chalk line between the two marks to give you a line to cut. You have to Slice the piece of board along this chalk line with the utility knife. You need to snap the piece with both hands against the line. You must fold it against the scored mark. You should Use the utility knife to cut the back side free after you snap the pieces.
Then, Place the pieces of concrete board on the wall. You can Mount the pieces on the wall with setting the drywall screws through the boards into the wall studs. You have to Keep at least an eighth-inch gap between all pieces. You need to Place the screws each three to four inches or based on the marks that are already on the face of the concrete board as a reference line. Next, Fill the gaps between all pieces with silicone caulk because it will allow for seasonal movement once the house expands and shrinks during the warmer and cooler weather of the year.
You must Leave the silicone caulk to dry for at least twenty four hours before installing your preferred method of waterproofing on top of the concrete board.