A method for installing the floor of a shower installation or the like comprising the steps of:
- (a) providing a carrier body assembly comprising a carrier body and a sealing membrane, the carrier body being a rigid body and comprising an upper surface, a lower surface, an outer periphery extending around the body, and a drain opening extending through the carrier body from the upper surface to the lower surface, the upper surface sloping towards the drain opening for flowing shower water falling on the upper surface to the drain opening, the sealing membrane comprising an inner portion and a flexible, pliant outer portion surrounding the inner portion, the inner portion permanently affixed to and covering one of the said inner and outer surfaces of the carrier body, the outer portion of the sealing membrane at least partially not permanently affixed to the carrier body and foldable away from the carrier body, the outer portion being foldable along a non-predetermined fold line, portions of the outer portion of the sealing membrane disposed on opposite sides of the fold line and immediately adjacent the fold line being foldable along the fold line 90 degrees or more while maintaining the integrity of the sealing membrane, the outer portion of the sealing membrane extendable beyond the entire outer periphery of the carrier body;
- (b) placing the carrier body on a substrate to support the carrier body and in close alignment with a neighboring surface to define the location of the floor of the shower installation, the upper surface of the carrier body facing away from the substrate;
- (c) placing the outer portion of the sealing membrane over the outer portion of the said one of the upper and lower surfaces of the carrier body and adhering the sealing membrane to the outer portion whereby the sealing membrane covers and adheres to the entire said one of the upper and lower surfaces of the carrier body;
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- (d) extending the sealing membrane away from the carrier body and against the neighboring surface whereby the sealing membrane defines a continuous surface extending from the carrier body to the neighboring surface that forms a seal between the carrier body and the neighboring surface.