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ICC-ES AC90 – Acceptance Criteria for Fiber Cement Siding Used as Exterior Wall Siding


ICC-ES AC90 establishes the requirements for fiber cement siding to be evaluated in an ICC-ES evaluation report under the International Building Code (IBC) and the International Residential Code (IRC).

The scope of AC90 covers the following aspects:

  • Materials: it specifies the requirements for the composition and properties of fiber cement siding, including the type and amount of fibers, cement, and other additives.
  • Physical properties: it defines the minimum requirements for the physical properties of fiber cement siding, such as flexural strength, impact resistance, moisture resistance, freeze-thaw resistance, and dimensional stability.
  • Performance: it outlines the performance requirements for fiber cement siding, including resistance to wind loads, impact loads, fire, and termites.
  • Testing: it details the testing procedures to be used to evaluate the properties and performance of fiber cement siding, including flexural testing, impact testing, moisture testing, freeze-thaw testing, dimensional stability testing, wind load testing, impact load testing, fire testing, and termite testing.
  • Installation: it provides guidelines for the proper installation of fiber cement siding to ensure its long-term performance and durability.

In essence, AC90 serves to ensure that fiber cement siding used in construction projects meets the necessary safety, performance, and durability standards as outlined in the IBC and IRC. This provides confidence to builders, contractors, and homeowners that the fiber cement siding will perform as expected and provide long-term protection for the building envelope.

ICC-ES AC90 Accredited Inspection Agency

Applied Testing & Geosciences, LLC is accredited for performing inspections using the ICC-ES AC90 acceptance criteria.

Contact us for more information.



fiber cement siding; flexural strength; impact resistance; moisture resistance; freeze-thaw resistance; dimensional stability; wind load; impact load; fire resistance; termite resistance; flexural testing; impact testing; moisture testing; freeze-thaw testing; dimensional stability testing; wind load testing; impact load testing; fire testing; termite testing