ASTM International Committee C11 on Gypsum and Related Building Materials and Systems approved 2 nonmetallic plaster base standards. While ASTM C1787 provides minimum performance requirements when nonmetallic plaster base (lath) is used with stucco, ASTM C1788 lists minimum installation requirements for nonmetallic lath with stucco. Also available, ASTM C1764 offers test methods for evaluating performance of vertical wall applications of lath under various test exposures.