Catherine:
In the past I have specified Stonehard Polymer Floor material and surfacing for seamless floors. You can Google Stonehard to get to their website. Proper installation requires a recessed floor slab then using the underlayment of the base material to create a slope to the drain. The material can be formed into a cove base. On the walls the company has similar type materials or one could use solid surface (corian or similar) sheets that are chemically welded. Ceilings could finish out with epoxy paint on gyp board, solid surface materials or epoxy paint on plaster.
I hope that helps,
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David Murray AIA
MBP
Charlotte NC
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