ICC-ES AC321
Full Name
ICC-ES AC321 – Acceptance Criteria for Treated-engineered-wood Siding
Scope
ICC-ES AC321 outlines the acceptance criteria for treated-engineered-wood panel and lap siding products intended for use as exterior wall-covering materials. The scope of AC321 includes:
- Materials: it specifies the requirements for the wood species, adhesives, preservatives, and other components used in the manufacture of the siding, ensuring their suitability for exterior applications.
- Manufacturing: it details the manufacturing processes for the siding, including panel formation, treatment, and finishing, to ensure consistent quality and performance.
- Performance: it outlines the testing methods and acceptance criteria for evaluating the performance of the siding, including its resistance to weathering, moisture, decay, insects, and fire.
- Durability: it addresses the durability of the siding, ensuring it can withstand long-term exposure to environmental conditions without significant degradation or loss of performance.
- Quality control: it establishes a quality control program to ensure that the siding consistently meets the requirements of the acceptance criteria, including inspections and testing procedures.
The AC321 acceptance criteria are used by manufacturers to obtain an evaluation report from ICC Evaluation Service (ICC-ES), which demonstrates that their siding products comply with the applicable building codes and standards.
Resources
Keywords
siding; treated-engineered-wood siding; wood; engineered wood; panel; lap siding; acceptance criteria; adhesive; preservative; weathering; moisture resistance; decay resistance; insect resistance; fire resistance; durability; quality control; inspection; testing; building code; standard; evaluation report