APA Performance Rated I-joists (PRI) are “I”-shaped engineered wood structural members that offer strength, versatility and economy for use in residential and light commercial applications. I-joists are comprised of top and bottom flanges of various widths united with webs of various depths. The flanges resist common bending stresses, and the web provides outstanding shear performance.
New design details from APA show how to correctly attach sprinkler systems to APA I-joists. The design details illustrate a variety of sprinkler attachments that incorporate fasteners permitted by the National Fire Protection Association (NFPA), design load assumptions published by the NFPA, and published design fastener capacities. Download the new Technical Note: Sprinkler Installation for APA Performance Rated I-Joists.
If you’re looking for detailed and technical information on I-joists, you may wish to jump directly to the I-joist section of the Publications Store. Here you will find a complete listing of all APA publications featuring I-joists, including case studies, technical sheets, builder tips and more. This section is searchable by keyword.
For floor framing details in CAD format, go to www.apacad.org. Details can be downloaded in .dwf, .dwg, .dxf or .pdf formats. A variety of I-joist floor framing and sprinkler mounting details are available.
I-joists can be manufactured using solid sawn lumber or structural composite lumber for the flange components, and plywood or oriented strand board for the web. This versatility allows the manufacturer to make the most efficient use of wood fiber resources in their region while producing products that consistently perform to known standards.
APA Performance Rated I-joists are manufactured to specific dimensions commonly used in residential construction. They are ideal for long spans and readily available from most builder supply sources.
APA trademarks appear only on products manufactured by APA member mills. The mark signifies that panel quality is subject to verification through APA audit– a procedure designed to assure manufacture in conformance with APA performance standards or the standard shown in the mark.