Meet ASTM C1396 Section 5 gypsum wallboard and Section 12 gypsum ceiling board specifications, with the lighter, dimensionally stable ToughRock® Lite-Weight Gypsum Board. This ½” (12.7 mm) gypsum board is ideal for use as a wall or ceiling covering material in both new building construction and renovation work. ToughRock Lite-Weight Gypsum Board has been specifically designed to perform like a ceiling board where improved sag resistance is desired.
Lighter in weight than traditional ToughRock® Gypsum Board
Specially designed with improved sag resistance, for ceiling applications
1/2″ (12.7 mm), ± 1/64″ (0.4 mm)
4 (1220 mm), ± 3/32″ (2.4 mm)
8′ (2440 mm) to 16′ (4880 mm) ± 1/4″ (6.4 mm)
1.4 (6.8) lbs./sq. ft., nominal (kg/sq.m²)1
°F•ft2•hr/BTU (m2•K/W): 0.45 (0.08)2
5/16″ (8 mm)3
1Represents approximate weight for design and shipping purposes. Actual weight may vary depending on manufacturing location and other factors.
2Per Gypsum Association document GA-235.
3Specified minimum values are as defined in ASTM C1396.
According to the Gypsum Association publication GA-216, gypsum board could be applied in a ceiling framed 24″ o.c. provided the board length is at right angles (perpendicular) to the framing members. When a water-based texture is to be applied, the maximum spacing for traditional 1/2″ gypsum board is 16″ o.c.
We always advise our customers to use either 5/8″ gypsum board, ToughRock® CD® ceiling board, or 1/2″ ToughRock Lite-Weight in such applications. Once the board sags, it is much more expensive to replace than to use the right product initially. Sag in the ceilings of new homes is a common complaint. Most often, research reveals it is not the board but job site conditions that cause the board to sag. Propane heaters combined with poor ventilation cause build-up of moisture in the house.