AC87 - Glass Fiber Reinforced Gypsum
ICC-ES Acceptance Criteria for Glass Fiber Reinforced Gypsum (GFRG)
Last updated: September 21, 2025
Overview
Glass Fiber Reinforced Gypsum (GFRG) is a material made of gypsum plaster strengthened with glass fibers. It is an economical, lightweight, and durable replacement for traditional plaster, often used for decorative interior elements. GFRG can be molded into virtually any shape – for example, forming intricate ceiling panels, columns, or dome decorations – while being much lighter than solid plaster pieces. The glass fibers in the mix give the gypsum extra tensile strength, so the finished pieces are strong, not prone to cracking, and can be installed more easily.
Purpose
This acceptance criteria provides a basis for evaluating glass fiber reinforced gypsum products that may not be directly covered by existing codes. It establishes testing protocols, structural performance requirements, and quality standards needed for code approval of these decorative and functional gypsum elements.
Benefits of Compliance
- Nationwide acceptance by building officials for GFRG installations
- Streamlined approval process for decorative gypsum products
- Third-party verification of structural and fire performance
- Enhanced marketability for architectural elements
Resources
Frequently Asked Questions
What is glass fiber reinforced gypsum used for?
GFRG is primarily used for decorative interior architectural elements such as ceiling panels, columns, cornices, domes, and moldings. It provides the look of traditional plaster at a fraction of the weight, making installation easier and reducing structural load requirements.
Is GFRG fire resistant?
Yes. Gypsum is naturally fire resistant, and GFRG products inherit this property. AC87 evaluation includes fire performance testing to verify that GFRG elements meet code requirements for flame spread and smoke development in their intended applications.
Can GFRG be used in exterior applications?
Standard GFRG is intended for interior use only, as gypsum is susceptible to moisture damage. Some manufacturers offer modified formulations for sheltered exterior use, but the specific ESR should be checked for approved applications and exposure conditions.
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