ICC-ES AC59

Full Name

ICC-ES AC59 – Acceptance Criteria for Direct-applied Exterior Finish Systems (DEFS)

Scope

ICC-ES AC59 outlines the requirements for evaluating exterior wall finishes that are applied directly to the substrate without an air gap or insulation. The scope includes:
  • Materials: it specifies the acceptable materials for direct-applied exterior finish systems (DEFS), including base coats, mesh reinforcement, finishes, and adhesives, ensuring they meet the necessary durability, weather resistance, and fire performance standards.
  • Design: it outlines the design requirements for DEFS, considering factors such as substrate compatibility, thickness, and attachment methods, to ensure proper adhesion, moisture control, and structural integrity.
  • Testing: it details the specific tests required to evaluate DEFS performance, including tests for water resistance, impact resistance, crack bridging, adhesion, and fire resistance.
  • Evaluation: it provides a framework for evaluating DEFS to ensure they comply with the acceptance criteria, including a review of their design, material properties, and test results.
ICC-ES AC59 is essential for manufacturers to demonstrate that their DEFS products meet the required performance and safety standards. It also assists building officials, designers, and contractors in selecting and installing appropriate DEFS for various applications.

Resources

Keywords

direct-applied exterior finish systems; acceptance criteria; evaluation; materials; design; testing; water resistance; impact resistance; crack bridging; adhesion; fire resistance; base coat; mesh reinforcement; finish; adhesive; substrate compatibility