The WH Mark for Building Product Certification North America’s leading safety and performance mark.

Intertek’s Warnock Hersey (WH) Mark has long been the industry preferred certification mark. Today, Intertek’s WH Mark can be found on more than 4,000 building and construction products. Having Intertek’s WH Mark on your product reflects your commitment to product safety, performance and quality to inspectors, builders and end users.

The presence of Intertek’s WH Mark also demonstrates that you have implemented an approved quality control program and are undergoing quarterly manufacturing plant audits to maintain product consistency.

Once your product has undergone vigorous safety or performance testing and was determined to be in compliance with the applicable standards your product will bear Intertek's widely known and accepted WH Mark.

Trusted Industry Experience For more than 100 years Intertek has served as the testing, evaluation, and certification leader for building products and materials.

Achieve Faster Time to Market :

When you work with Intertek, you’re guaranteed the knowledge and operational excellence that only an experienced partner can provide. We understand that lost time in testing means lost revenue, so we work closely with you during each step of the process. From an initial engineering consultation to project planning and final submission, we’ll ensure your deadlines and time to market goals are being met.

Intertek provides a variety of testing and certification services for your products including fire testing, physical property testing, structural testing, and performance testing. What’s more, throughout our global network of labs we have the ability to test your products to applicable ANSI, ASTM, CCMC, CSA, EPA, ICBO, ICC-ES, UL, and ULC standards.

Whether testing to industry requirements, standards or for R&D, our team will work with you to ensure you are able to reach your target market quickly and cost effectively.

Leverage Our Wealth of Accreditations:

Intertek is recognized by the world's leading code bodies; as a Nationally Recognized Testing Laboratory (NRTL) by OSHA; recognized by Standards Council of Canada (SCC); and A2LA, APLAC, and ILAC accredited for Asia and other parts of the world. Our additional accreditations include those by the Standards Council of Canada (SCC), the National Evaluation Service (NES), the American National Standards Institute (ANSI) and the International Code Council - Evaluation Service (ICC-ES).

To learn more about Intertek’s WH Mark, visit us on line at www.intertek.com/marks/wh,

email icenter@intertek.com or call 1-800-WORLDLAB.