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I-joists are strong, lightweight, "I" shaped engineered wood structural members that meet demanding performance standards. I-joists are comprised of top and bottom flanges, which resist bending, united with webs, which provide outstanding shear resistance. The flange material is typically laminated veneer lumber (LVL) or solid sawn lumber, and the web is made with plywood or OSB. The robust combination of structural characteristics results in a versatile, economical framing member that is easy to install in residential and light commercial projects.
I-joists are used extensively in residential floor and roof framing. They are ideal for long spans, including continuous spans over intermediate supports. Because I-joists are straight and true, it's easier for builders to avoid crowning and maintain a level framing surface. In addition, wood I-joists are typically stocked and readily available in depths that meet the needs of residential framing.
9-1/2", 11-7/8", 14", 16". Flange widths vary from 1-1/2" to 3-1/2"; long lengths are readily available.
I-joists are popular for floor and roof framing. Many APA member-manufacturers have software design tools; contact the manufacturer (at right) for more information.
APA Performance Rated I-joists (PRIs) are manufactured in accordance with APA PRI-400, Performance Standard for Residential I-joists. This Performance Standard provides an easy-to-use table of allowable spans for applications in residential floor construction, allowing designers and builders to select and use I-joists from various member manufacturers using just one set of span tables. APA PRIs are recognized through ICC-ES ESR-1405.
APA trademarks appear only on products manufactured by APA member mills. The mark signifies that product 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.
Includes information on span ratings, installation details, cantilever designs, architectural specifications and engineering design properties for APA Performance Rated I-Joists.
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Access a complete list of APA publications about I-joists in APA's Resource Library.
Learn about several options that enhance the fire performance of I-joist floor systems and comply with the International Residential Code (IRC) by visiting the I-Joist Fire Assemblies page.
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A discussion of the durability and safety of wood I-joist floor assemblies in structure fires. Includes APA’s recommendation to increase the fire endurance of all floor-joist assemblies based on the International Building Code.
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Contains Q&A concerning fire protective coatings. Certification and inspection of products treated with fire-protective coatings are outside the scope of APA.
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APA, AWC and WIJMA jointly developed this paper that describes the history, background and intent of the IRC provisions for fire protection of floors as well as the methods used for establishing equivalence and compliance with these fire protection requirements.
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APA, AWC and WIJMA jointly developed this paper that describes the basic code recognition for prefabricated wood I-joists and the need for product certification in compliance with the codes.
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APA developed this paper that describes the basic fire protection requirements for prefabricated wood I-joists with factory-applied fire protection solutions for compliance with the codes.
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When you choose Trus Joist, you're choosing the brand that:
-Invented the very first I-Joist over 50 years ago
-Lead innovation and design to create a suite of Engineered Wood Products, including I-Joist, LVL Microllam, LSL Timberstrand, and PSL Parallam
-Pushed the limits of span charts to make the open floor concepts of today a reality
-Has been the #1 used I-Joist for the past 14 years
-And is one of the most trusted brands in the building community today.
Trus Joist. The Only Choice.
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Available Sizes
Span Chart
L/480 is the design criteria we recommend for the best performing floor
Features and Benefits:
-LVL Flange for superior strength and a squeak-free floor
-Capable of spans up to 32'
-Pre-notched holes for mechanicals
-Multiple depths and series for any application
-In-house design and engineering
-Long Spans
For more door skin plywoodinformation, please contact us. We will provide professional answers.
I-Joists can span up to a whopping 32' without support, giving custom home builders the ability to create open floor plans that customers demand
-LVL Flange
An LVL flange is critical for a high performing floor because it prevents squeaky floors in two ways. 1) the LVL flange holds fasteners better, preventing loose nails that cause squeaks, and 2) it will not shrink over time with the moisture change which is another common cause of squeaks
-Engineered for Consistency
All TJI Joists will be perfectly straight and will not twist, warp, or cup
-Allow for spacing for HVAC, Electrical, and Plumbing
Large holes can be cut in the webbing of TJI Joists, allowing for mechanicals to be easily run and installed. Joists can also be spaced wider than traditional solid sawn joists which allows for quicker and easier installation
-Fast and Easy Install
All TJI Joists are designed using patented software that designs a floor taylor-made for every home. This software creates a layout and specifies where every single framing member goes. When the material arrives on the jobsite, there is minimal cutting, and carpenters know exactly where every joist goes.
Trus Joist I-Joist Product Page
Trus Joist I-Joist Installation Guide
Allowable Holes I-Joists & Beams
Trus Joist I-Joist Spec Sheet
Trus Joist I-Joist Warranty
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Floor Plan Takeoff Process
Sample Floor Plan Layout
Minimum Criteria Span (per code)
Fiber Source
Installation Videos
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