Mold needs two things to survive and spread: moisture and food.
Because it's susceptible to moisture, traditional paper-faced
drywall is mold's favorite sandwich, with two outer faces of
paper as the bread and the gypsum stuck in the middle as
baloney. Gypsum is a mineral, and though mold cannot digest it,
the cellulose in the paper can be degraded by some molds. The
drywall paper is like bread in another way: the paper contains
up to one percent starch, another nutrient for mold. A great
alternative to traditional, paper-faced drywall is Georgia-
Pacific's DensArmor® Plus , a relatively new type of drywall in
which the paper faces have been replaced by thin, fiberglass
mats. It's moisture-resistant, and because fiberglass, like
gypsum, is a mineral, there are no nutrients on which the mold
can grow.