FIREBLOC® 45 Gypsum Wallboard

Firebloc 45


1/2’’ FireBloc® 45 gypsum wallboard is manufactured with additional properties to enhance the core and allow superior performance to resist the passage of fire, and has achieved a 45 minute fire rating on wood stud walls (per ASTM E119). FireBloc 45 panels are designed for use in wall and ceiling applications and approved to be applied parallel or perpendicular to ceiling framing spaced up to 24’’ o/c, even when a hand applied or water based texture is used for decoration. This fire-resistant gypsum core is encased in 100% recycled natural-finish paper on the face side and sturdy liner paper on the back. 

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

Basic Uses

1/2" FireBloc 45 gypsum wallboard is designed for interior walls or ceilings in new construction or renovation projects and may be attached to wood or metal framing by the use of screws, nails or adhesive. Some benefits of selecting FireBloc 45 include:

  • This panel achieved a 45 minute fire rating per ASTM E119 when applied on wood framed partition walls spaced not more than 16" o/c.
  • FireBloc 45 is also designed for use in non-fire rated wall and ceiling applications which are spaced no more than 24’’ o/c.
  • Approved to be applied parallel or perpendicular to ceiling framing spaced up to 24’’ o/c, even when a hand applied or water based texture is used for decoration.
  • With joints covered, FireBloc 45 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).


FireBloc 45 gypsum wallboard has achieved UL Environment’s GREENGUARD GOLD Certification. GREENGUARD Certified products are scientifically proven to meet some of the world’s most rigorous, third-party chemical emissions standards, helping reduce indoor air pollution and the risk of chemical exposure while aiding in the creation of healthier indoor environments. 
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Product Data


Thickness Widths Lengths Edge Types
1/2’’ (12.7mm) 4’ (1219mm) 12’ (3658mm) 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 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, and 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 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 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 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.
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).

Applicable Standards

ASTM C 1396 section 12 (C 36)
Federal Specification SS-L-30D Type III
Type X
ASTM C 840
Gypsum Association GA-216
Gypsum Association GA-214
Fire Resistance
ASTM E119 (WFCi 15142r1)
Surface Burning Characteristics
Flame Spread   0
Smoke Developed   0
ASTM E 136


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.