How Do I Replace a Regular Size Tub with a Fiberglass Shower?

Shut the water down in your home by turning off the water line. Cut through the tub's surround walls with a reciprocal saw and pull the walls down by hand. Use a crowbar to pry the walls from the framing. Cut through the drain pipe under the tub with the reciprocal saw. Once the tub walls are removed, pull the tub out of the alcove.

Clear out all the remnants of the drywall and all debris remaining from the demolition. Only the shower framing walls should remain.

Connect the drain to the new shower base by placing it into the shower base drain hole and tightening the nut on the bottom of the drain with a wrench. Set the shower base into the alcove. If the drain doesn't line up with the existing drain hole, mark the location of the new drain on the floor with a pencil and cut a new hole into the flooring at this location with the reciprocal saw.

Level the shower base with a carpenter's level. Insert shims under the base in any area where the base isn't reading level. Remove the base and secure the shims to the floor with regular screws and a power screwdriver. Mount the base to the framing with regular screws and the power screwdriver after all sides are completely level.

Mount new drywall to the framing with drywall screws and the power screwdriver. Tape the seams and apply joint compound with a scraper. Let the compound dry. Cut a hole in the shower wall panels for the shower faucet with a hole saw. Glue the shower walls to the drywall using construction adhesive. Firmly press the walls to the drywall, and let the entire shower surround dry for up to 12 hours or as directed by the adhesive label.