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ICC-ES AC318 – Acceptance Criteria for Structural Cementitious Floor and Roof Sheathing Panels


ICC-ES AC318 defines the acceptance criteria for structural cementitious floor and roof sheathing panels. These criteria are used for evaluating and addressing these panels in an ICC-ES evaluation report under the International Building Code (IBC) and International Residential Code (IRC).

The scope of AC318 includes:

  • Materials: it specifies the acceptable materials for the cementitious matrix, reinforcement, and any facings or coatings used in the panels.
  • Structural design: it outlines the structural design requirements for the panels, including their bending strength, shear strength, and deflection limits under various load conditions.
  • Fire resistance: it specifies the fire-resistance ratings required for the panels based on their intended use and the building’s construction type.
  • Durability: it addresses the durability requirements for the panels, including resistance to moisture, freeze-thaw cycles, and other environmental factors.
  • Testing: it details the testing procedures and protocols for evaluating the structural, fire resistance, and durability properties of the panels.

By defining these criteria, AC318 ensures that structural cementitious floor and roof sheathing panels meet the necessary standards for safety, performance, and compliance with building codes. It provides confidence to building officials, designers, and builders that these panels are suitable for their intended applications.

ICC-ES AC318 Accredited Inspection Agency

Applied Testing & Geosciences, LLC is accredited for performing inspections using the ICC-ES AC318 acceptance criteria.

Contact us for more information.



structural sheathing; cementitious panel; floor; roof; bending strength; shear strength; deflection; fire resistance; moisture resistance; freeze-thaw resistance