Producer Members

Any business entity engaged in the manufacture of prefabricated wood I-joists or structural composite lumber is eligible to become a member of the association. WIJMA is not staffed. Rather, technical representatives of each producer member periodically meet to discuss and address engineering principles, quality control practices, codes, standards, and industry activities. Each producer member pays annual dues and carries equal voting status.


For more information about our producer members and their respective product lines, please click on the links below. See also our Contact page.

To become a member, contact Mark Bartel at (717) 788-4879 or email

Associate Members

Any entity engaged in a business or service allied with the prefabricated wood I-joist industry or supportive of it may be an associate member. There are approximately 25 organizations that are currently listed as associate members. At the present time, associate membership is free.