Things You Will Need
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Mix a batch of ready-mix mortar according to the manufacturer's instructions. Pour a 2-inch layer over the sub floor. Create a slight slope towards the center drain. Allow the mortar 24 hours to cure.
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Install a sheet of waterproof vinyl membrane over the mortar. Position the vinyl membrane flat on the ground and 1 foot up the side walls. Overlap the vinyl at each corner and staple it to the wall studs.
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Staple the vinyl into the studs with a slap stapler. Fold the vinyl down over the curb and staple the shower pan liner to the front of the curb. Trim off the excess vinyl.
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Glue the vinyl shower pan to the drain hole to keep it centered.
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Mix another batch of mortar and place a 2-inch layer on top of the vinyl sheet. Make sure there is a slight slope towards the center drain. Allow the mortar 24 hours to cure.
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Lay a pre-fabricated vinyl shower pan on top of the second layer of mortar, with the drain hole positioned over the shower pan's hole.
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Bore pilot holes through the sides of the pan, then screw the pan to the wall studs with galvanized screws.