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LIGHTROC® Type X Gypsum Board

LightRoc®  Type X gypsum wallboard panels are engineered to be lighter in weight than traditional Type X wallboard, yet maintain the same performance standards the industry has come to depend on for almost 60 years from American Gypsum. With its UL classification (LightRoc), this panel is approved for use in over 100 fire rated assemblies including walls, ceilings, horizontal membranes, shaftwalls, columns, beams and head-of-wall details. The fire-resistant gypsum core is encased in 100% recycled natural-finish paper on the face side and sturdy liner paper on the back side. Long edges of the panels are tapered or square, with tapered edges allowing joints to be easily reinforced and finished with the joint treatment systems.

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

Currently this product is limited to the South Region. Please check with your local American Gypsum sales representative for availability. 

Basic Uses

American Gypsum’s lightweight 5/8’’ LightRoc Type X wallboard is normally used to achieve specific fire rated assemblies in commercial and residential applications. It is designed for direct attachment by screws, nails, or adhesive to wood or metal framing and even existing surfaces.

With joints covered, LightRoc Type X gypsum wallboard will resist the passage of smoke. For additional information on smoke barriers, refer to Gypsum Association publication, “Building and Inspecting Smoke Barriers” (GA-618).


LightRoc Type X gypsum wallboard has attained the GREENGUARD Indoor Air Quality Certified status and GREENGUARD Children & Schools Indoor Air Quality Certified status.

Product Data


ThicknessWidthsLengthsEdge Types
5/8” (15.9mm) 4’ (1219mm) 8’ - 12’ (2438mm – 3658mm) Tapered

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

Weight     2.04 lb. s/f *

Thermal Resistance “R” Value  5/8” = 0.61

* (Represents approximate weight for design and shipping purposes. For specific product weight in your area consult the local American Gypsum sales representative.)

Technical Data

Storage and 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


ASTM C 1396 section 5 (C 36)


ASTM C 840

Gypsum Association GA-216
Gypsum Association GA-214

Nail Pull, Humidified, Deflection, Flexural Strength, Core Hardness

ASTM C 473 

Surface Burning Characteristics

Flame Spread 0
Smoke Developed 0

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.

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