AC107 - Sandwich Panels
ICC-ES Acceptance Criteria for Sandwich Panels
Last updated: September 21, 2025
Overview
Sandwich panels are layered building panels consisting of two stiff, thin face skins bonded to a lightweight thick core. The core is often an insulating foam or other low-density material, and the face sheets can be metal, wood, or composite. This construction produces a component that is very strong and rigid for its weight, making it useful for walls, roofs, or floors that need both structural support and thermal insulation. Sandwich panels are commonly used in commercial and industrial construction where speed of installation and energy efficiency are important.
Purpose
This acceptance criteria provides a basis for evaluating sandwich panel systems 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 composite building elements.
Benefits of Compliance
- Nationwide acceptance by building officials for sandwich panel installations
- Streamlined approval process for composite panel systems
- Third-party verification of structural and thermal performance
- Enhanced marketability for innovative building systems
Resources
Frequently Asked Questions
What are sandwich panels made of?
Sandwich panels consist of two thin, stiff face skins bonded to a lightweight core. Face sheets can be metal, wood, or composite materials, while the core is typically insulating foam (polyurethane, polystyrene, or mineral wool) or another low-density material.
Where are sandwich panels commonly used?
Sandwich panels are widely used in commercial and industrial construction for walls, roofs, and cold storage facilities. Their combination of structural strength, thermal insulation, and fast installation makes them popular for warehouses, factories, and commercial buildings.
Does AC107 cover both structural and insulating performance?
Yes. AC107 evaluation covers both the structural capacity (load-bearing, wind resistance) and thermal performance (R-value, air leakage) of sandwich panel systems, ensuring they meet building code requirements for both functions.
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