I-joists are prefabricated ‘I’ shaped engineered wood structural members, using sawn or structural composite lumber flanges and OSB webs, bonded together with exterior type adhesives. I-joists are ideal for long spans, including continuous spans over intermediate supports and especially suitable for floor and roof framing in both residential and non-residential construction.
American producers mainly supply I-joists in lengths up to 60 feet, and the most common depths, in inches, are 9-1/2, 11-7/8, 14 and 16. Each manufacturer provides technical material specific to their own product. For example, APA member mills produced this construction.
In the EU and UK, there is no standard for I-joists. To obtain a mark of conformity, each manufacturer must first apply for a European Technical Assessment (ETA) to measure the product against specific test requirements.This leads to a European Assessment Document (EAD) which is currently accepted by the EU and UK construction.
APPLICATIONS | General Description | Plywood Grade Rated (with span rating) | Non-Rated Plywood Grade | Bond Classification/Glue Line | Exterior veneer grades | Exposure 1 veneer grades | Span rating/support spacing and designated loading | ||
NON-STRUCTURAL | Where appearance of both sides is important for interior applications, with smooth surfaces suitable for painting | A-A (NON-RATED) | US panels are available in two classifications: Exterior - equivalent to (BS) EN 314 Bond Class 3 or Exposure 1 (always includes D veneer) - Bond Class 2 | Face A; Inner C; Back A | Face A;Inner D; Back A | Span rating not applicable |