Specification

All surfaces, including applied joint compound, must be thoroughly dry, dust-free, and not glossy. Prime with
Sheetrock First Coat primer or with an undiluted, interior latex flat paint with high-solids content. Allow to dry
before decorating.
To improve fastener concealment, where gypsum panel walls and ceilings will be subjected to severe artificial
or natural side lighting, or be decorated with a gloss paint (egg shell, semi-gloss or gloss), the gypsum panel
surface should be skim coated with joint compound. This equalizes suction and texture differences between
the drywall face paper and the finished joint compound before painting. As an alternative to skim coating, or
when a Level 5 finish is required, use Sheetrock tuff-hide primer-surfacer.
Test Data
Installation
ASTM Test Method ASTM C-1396 Specification
1/2" wallboard Sheetrock
®
Brand
UltraLight Panels
Noncombustibility E-136 Pass Pass
Surface Burning Characteristics E-84 Flame Spread Index, not
greater than 25
15
Smoke Developed Index,
not greater than 450
0
Hardness (lbf) Core C-473 (B) Not less than 11 Meets or exceeds
End C-473 (B) Not less than 11 Meets or exceeds
Edge C-473 (B) Not less than 11 Meets or exceeds
Flexural Strength (lbf) Parallel C-473 (B) Not less than 36 Meets or exceeds
Perpendicular C-473 (B) Not less than 107 Meets or exceeds
Humidified Deflection, Gypsum Wallboard (in) C-473 Not greater than 1 1/4" Less than
Humidified Deflection, Gypsum Ceiling Board (in) C-473 Not greater than 5/16" Less than
Nail Pull Resistance (lbf) C-473 (B) Not less than 77 Meets or exceeds
Tested by Progressive Engineering, Inc. Reference PEI report 2008-212A.
Ceiling Installation, Single Layer
Application method (long edge position
relative to framing)
Frame Spacing Max. Weight of insulation
support by drywall
Application method if water-
based texture is applied
Perpendicular only 24" 1.3 psf Perpendicular only
Perpendicular or parallel 16" 2.2 psf
Installed in accordance with ASTM C840
Fastener Spacing, Single Layer Over Wood Framing
Fastener Type Location Maximum Spacing
in mm
Nails, 1 1/4" annular ring 5d
drywall nail complying with
ASTM C514
Ceilings 7 178
Sidewalls 8 203
Screws, 1 1/4" Type W bugle head
complying with ASTM C1002
Ceilings 12 305
Sidewalls 16 406
Screws (same as above) RC-1 Channels, ceilings or sidewalls 12 305
Adhesive with nails or screws
same as above
Ceilings, long edges perpendicular to
framing members
16" or 406 mm at ends, 1 fastener per framing member
at edges, 1 fastener in center of panel
Sidewalls, long edges perpendicular
to framing members
16" or 406 mm at ends, 1 fastener per framing member
at edges, 1 fastener in center of panel
Sidewalls, long edges parallel to
framing members
16" or 406 mm along edges, 1 fastener per framing
member at ends, 1 fastener in center of panel