ICC-ES AC212
Full Name
ICC-ES AC212 – Acceptance Criteria for Water-resistive Coatings Used as Water-resistive Barriers over Exterior Sheathing
Scope
ICC-ES AC212 outlines the acceptance criteria for water-resistive coatings that are used as water-resistive barriers (WRBs) over exterior sheathing in building construction. The primary goal is to ensure these coatings effectively prevent water intrusion while allowing vapor permeability, contributing to the overall weather resistance of the building envelope.
Key areas covered by AC212 include:
- Material properties: defining the requirements for the chemical composition, physical properties (e.g., tensile strength, elongation), and water resistance of the coating materials.
- Performance testing: outlining specific tests to assess the coating’s water resistance, including water penetration, structural performance under racking, weathering resistance, and adhesion to the sheathing substrate.
- Application requirements: specifying the acceptable methods and conditions for applying the coating to ensure proper coverage and adhesion, as well as detailing any necessary preparation of the substrate.
- Quality control: establishing guidelines for quality control during the manufacturing and application processes to maintain consistency and performance of the water-resistive coating.
By adhering to AC212, manufacturers can demonstrate that their water-resistive coatings meet the required performance standards for use as WRBs. This provides confidence to building officials, designers, and contractors that the coatings will effectively protect the building from water damage while allowing for proper moisture management.
Resources
Keywords
water-resistive coating; water-resistive barrier; exterior sheathing; acceptance criteria; tensile strength; elongation; water resistance; water penetration; structural performance; racking; weathering resistance; adhesion