ICC-ES AC209

Full Name

ICC-ES AC209 – Acceptance Criteria for Trowel-, Spray- or Roller-applied Water-resistive Coatings Used as Weather-resistive Barriers over Exterior Cementitious Wall Coverings

Scope

ICC-ES AC209 outlines the acceptance criteria for trowel, spray, or roller-applied water-resistive coatings used as weather-resistive barriers (WRBs) over exterior cementitious wall coverings. These coatings are designed to prevent water intrusion while allowing vapor transmission, protecting the building envelope from moisture damage. The scope of AC209 includes:
  • Material properties: it specifies the minimum requirements for these coatings, including their water resistance, vapor permeability, and durability when exposed to weathering.
  • Testing procedures: it details the standardized testing methods for evaluating the water resistance, vapor permeability, and other performance characteristics of the coatings.
  • Application requirements: it provides guidelines for the proper application of these coatings over cementitious wall coverings to ensure their effectiveness as weather-resistive barriers.
  • Evaluation and certification: it outlines the process for evaluating and certifying these coating products to ensure they meet the acceptance criteria.
By adhering to ICC-ES AC209, manufacturers can ensure their coatings meet the required performance standards for use as WRBs over exterior cementitious wall coverings. This helps builders and homeowners select products that effectively protect their buildings from moisture damage.

Resources

Keywords

water-resistive coating; weather-resistive barrier; exterior cementitious wall covering; acceptance criteria; water resistance; vapor permeability; durability; testing; application; evaluation; certification
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