No Sag Drywall
USG has recently introduced a
1/2-inch sag-resistant drywall —
Sheetrock Ceiling Board — similar
to Domtar CD Ceiling Board (see
"For What It's Worth," 7/90). The
ceiling boards are reportedly as
stiff as 5/8-inch drywall, but as
light as conventional 1/2-inch
material. USG would not tell us
how their board is made, except
to say it has a "specially formulated
core." Domtar has a three-layer
"controlled density" core. The
gypsum near each face is concentrated
to increase the board's
strength. Both 1/2-inch ceiling
boards are designed for 24-inch
on-center framing, where extra
insulation is required, or where
the moisture in heavy-textured
finishes might weaken ordinary
drywall. For more information,
contact United States Gypsum,
101 S. Wacker Drive, Chicago, IL
60606, 800/621-9622; or