AC162 - Reinforced Cementitious Panels
ICC-ES Acceptance Criteria for Reinforced Cementitious Panels
Last updated: September 21, 2025
Overview
Reinforced Cementitious Panels are building materials made from cement combined with reinforcing fibers or mesh to create durable, lightweight panels for construction use. These panels typically include portland cement, sand, and reinforcement materials like glass fibers, cellulose, or synthetic fibers. They offer good fire resistance, dimensional stability, and workability, making them suitable for both interior and exterior applications. Reinforced cementitious panels are often used as wall sheathing, siding, or interior paneling where moisture resistance and structural performance are important.
Purpose
This acceptance criteria provides a basis for evaluating reinforced cementitious panel 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 cement-based building panels.
Benefits of Compliance
- Nationwide acceptance by building officials for cementitious panel installations
- Streamlined approval process for cement-based building products
- Third-party verification of structural and fire performance
- Enhanced marketability for innovative panel systems
Resources
Frequently Asked Questions
What makes cementitious panels different from regular concrete panels?
Reinforced cementitious panels incorporate fibers or mesh (glass, cellulose, or synthetic) into the cement matrix, making them lighter and more crack-resistant than plain concrete panels. This reinforcement allows thinner profiles while maintaining structural integrity.
Can AC162 panels be used as exterior siding?
Yes. Many reinforced cementitious panels are designed for exterior applications including siding, sheathing, and soffit panels. The specific ESR for each product specifies approved applications and required installation details for exterior exposure.
Are cementitious panels fire resistant?
Cement-based panels are inherently noncombustible and offer excellent fire resistance. AC162 evaluation includes fire performance testing, and many products achieve fire-rated assembly listings for use in fire-resistive wall and floor constructions.
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