LIGHTROC® Lightweight Gypsum Board End Tape

LIGHTROC® Lightweight Gypsum Board


LIGHTROC® Lightweight Gypsum Board

LightRoc® gypsum wallboard is lighter in weight than traditional 1/2” drywall. The wallboard panels consist of a fire-resistant gypsum core that is encased in natural-finish paper on the face side and sturdy liner paper on the back side which are both 100% recycled. The face paper is folded around the long edges to reinforce and protect the core, with the ends being square-cut and finished smooth. Long edges of the panels are tapered, allowing joints to be reinforced and concealed with a joint compound system.

American Gypsum products contain no asbestos and no detectable levels of formaldehyde.


With up to 90% of our time spent indoors - in an office building, shopping center, or school - indoor air quality becomes a crucial factor when selecting the proper building materials.

LightRoc® family of gypsum wallboard products has attained the GREENGUARD Indoor Air Quality Certified® status and GREENGUARD Children & SchoolsSM status. To obtain the M-Bloc product certificates please select the GREENGUARD link at right.

Product Data


Thickness Widths Lengths Edge Type
1/2" (12.7mm) 4' (1219mm) 8' - 12' (2438mm - 3658mm) Tapered
1/2" (12.7mm) 54" (1372mm) 12' & 14' (3658mm & 4267mm) Tapered

Special lengths or edges may be available on special order. Consult your American Gypsum sales representative for details.

Thermal Resistance "R" Value 1/2" = 0.50

Technical Data

Storage & Handling

Gypsum board does not generate or support the growth of mold when it is properly transported, stored, handled, installed, and maintained. However, mold spores are present everywhere and when conditions are favorable; mold can grow on practically any surface. GYPSUM BOARD MUST BE KEPT DRY to prevent the growth of mold.

Gypsum board must be stored in an area that protects it from adverse weather conditions, condensation, and other forms of moisture. Job site conditions that can expose gypsum board to water or moisture must be avoided.

Gypsum board must be protected during transit with a weather-tight cover in good condition. Plastic shipping bags are intended to provide protection during transit only and must be promptly removed upon arrival of the load. Failure to remove the shipping bag can increase the likelihood of developing conditions favorable to the growth of mold.

Gypsum board that has visible mold growth must not be used. For additional information, refer to Gypsum Association publication,
"Guidelines for the Prevention of Mold Growth on Gypsum Wallboard" (GA-238).

Gypsum board must be stored off the ground and under protective cover. Sufficient risers must be used to assure support for the entire length of the wallboard to prevent sagging.

Gypsum board must be delivered to the job site as near to the time it will be used as possible. Individuals delivering gypsum board to jobsites should ensure that it is carried, not dragged, to place of storage/installation to prevent damage to finished edges.

Gypsum board shall always be stacked flat - NEVER on edge or end. Gypsum board stacked on edge or end is unstable and presents a serious hazard should it accidentally topple. Gypsum board should be placed so weight is evenly distributed and the floor is not overloaded.

Applicable Standards

Manufacturing ASTM C 1396 section 5 (C 36)
Federal Specification – SS-L-30D Type III
Installation ASTM C 840
Gypsum Association GA-216
Gypsum Association GA-214
Surface Burning Characteristics ASTM E 84
Flame Spread 5
Smoke Developed 0
Non-Combustibility ASTM E 84
Hardness ASTM C 473
Flexural Strength ASTM C 473
Humidified Deflection ASTM C 473
Nail Pull Resistance ASTM C 473

LEED / Green

LEED Contributions

Our products can contribute to the following credits within the Materials and Resources (MR) category.

  • LEED MR Credit 2: Construction Waste Management
  • LEED MR Credit 4: Recycled Content
  • LEED MR Credit 5: Regional Materials

Our products can contribute to the following credit within the Indoor Environmental Quality (IEQ) category.

  • LEED IEQ Credit 4.6: Low-Emitting Materials - Ceiling and Wall Systems (SCHOOLS ONLY)

To learn more please click the LEED link at right.