A lath is a thin, narrow strip of some straight-grained wood or other material, including metal or gypsum. A lattice, or lattice-work, is a criss-crossed or interlaced arrangement of laths, or the pattern made by such an arrangement. Lath is the basic material used in the formerly common building technique known as lath and plaster, which was used to make interior walls.
Gypsum lath consists of gypsum plaster sandwiched between two sheets of absorbent paper. It was invented in 1910, and multiple variations were developed in the 1930s. Gypsum was safer than wood lath as it wasn't combustible, was easier to use, and gave better results. The lath and plaster method declined in the 1950s, as it was replaced by the more efficient drywall.