Gypsum sheathing is most commonly manufactured
with a water-resistive treated core but may be
available in a nontreated core. Treated core gypsum
sheathing is a versatile, economical, water-repellent
panel sheathing and is intended for use as a substrate
sheathing under a variety of exterior wall claddings in
any climate. Nontreated core gypsum sheathing is
intended for