A shower pan includes a draining base portion that drains to an orifice. The draining base portion includes a support structure for supporting a slab floor member (for example, a single piece of granite, marble, or engineered stone) above the orifice such that a planar upper surface of the floor member has a slight tilt. The pan is installed such that the tilt is toward a shower head. The shower enclosure is finished by cladding the enclosure walls with a finishing material (for example, granite, marble or engineered stone) such that the finishing material extends down into the pan. The floor member is placed on the support structure such that water from the shower head that falls on the floor member runs off one or more edges of the floor member and is conducted to the orifice under the floor member by a draining portion of the draining base portion.