Composite Panel Association: Innovative Products for a Sustainable FutureEngineered Wood Siding and Trim (EWST) are categories of composite panels that have been designed and manufactured to perform in interior and exterior exposure applications with the appearance of traditional wood. These advanced composites can be engineered with enhanced resistance to moisture, dimensional stability and protection against fungal decay and termites.
The engineered properties translate into long-lasting durability allowing for decades of service life while maintaining their attractive appearance. Today’s engineered wood siding and trim products are highly versatile and come in many forms including sophisticated woodgrains and embossed surfaces.
The American National Standard for Hardboard Siding (ANSI A135.6), now referred to as the Engineered Wood Siding Standard, covers requirements and methods of testing for exterior durability, dimensions, straightness, squareness, physical properties and surface characteristics. It also includes trade terms and methods of identifying engineered wood siding. Third-party certification to the ANSI Standards is required for many applications of siding panels. Many building code jurisdictions require the physical properties of engineered wood siding to be third-party certified. CPA’s accredited certification program is recognized and approved by building code officials to evaluate siding products for code compliance.
An ANSI Engineered Wood Trim Standard is under development and is expected to be complete in 2012. The new standard will cover requirements and methods of testing for exterior durability as well as physical and mechanical properties. This consensus-based standard is being sponsored by CPA.
Detailed product information is available in the Product Locator.
Available from the association bookstore:
ANSI Engineered Wood Siding Standard ANSI A135.6 (2006)
Available for download:
Maintenance Tips for Engineered Wood Siding Technical Bulletin [PDF]
