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.