For the purpose of the Washington state public works law, chapter 39.12 RCW, tile setters apply tile to floors, walls, ceilings, stair treads, promenade roof decks, garden walks, swimming pools, and all places where tiles may be used to form a finished surface for practical use, sanitary finish or decorative purpose.

The tile is defined as all burned clay products, as used in the tile industry, either glazed or unglazed, and all composition materials and all substitute materials in single units up to and including 15" x 20" x 2" (except quarry tiles larger than 9" x 1 1/4"), and all mixtures in the form of cement, plastics and metals that are used as a finished surface.

The work includes, but is not limited to:

• Measuring and cutting metal lath to size for walls and ceilings with tin snips. Tacking lath to wall and ceiling surfaces with staple gun or hammer. Spreading plaster base over lath with trowel and leveling plaster to specified thickness, using screed.

• Spreading concrete on subfloors with trowel and leveling it with screed.

• Spreading mastic or other adhesive base on roof deck, using serrated spreader to form base for promenade tile.

• Cutting and shaping tile with tile cutters and biters.

• Positioning tile and tapping it with trowel handle to affix tile to plaster or adhesive base.