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After a structural framework is built along walls, ceilings, and other foundations, lathers install a base to hold plaster, tiles, or acoustical materials in place. This base material is called lath. Metal laths are made in mesh form and are commonly used in kitchens and bathrooms, where tile walls are frequently installed. Gypsum lath is made of several layers of fiberboard, paper, or felt bonded to a hard plaster core. As a barrier against moisture and the cold, lath can also be made with reflective sheets of foil or hard plastic.