I-joists are structural engineered wood products used for framing floors and roofs. The consistency allows for solid performance and smooth ceilings.
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Like all joists, I-joists are typically used to transfer loads to beams, walls, and the foundation. Unlike traditional dimension lumber, which can twist, split, and bow, I-joists offer better consistency and strength while weighing less and being easier to handle. These attributes make I-joists popular with builders of single-family homes, as well as light commercial and multi-family structures.
I-joists have become a construction industry standard largely because they offer reliable strength, consistency, and engineered performance that can provide a better value than dimension lumber. But that&#;s just the start of their benefits.
More Strength: Thanks to their unique construction, some I-joists, including Boise Cascade® I-Joists, are 20 percent stronger than comparably sized dimension lumber.
Longer Lengths: I-joists can be used to create long spans with less blocking to install faster. Something that dimension lumber simply can&#;t match.
Easier Handling: Dimensional lumber can be heavy and difficult to handle, but I-joists are lightweight, helping to reduce labor hours and labor costs.
Adaptable on the Jobsite: Most I-joists come with pre-stamped knockouts for wires, and allow for larger holes to be cut out of the web for mechanicals and can have very little change in performance. This makes running HVAC, electrical, and plumbing much faster and simpler.
Faster Installation: I-joists can be quickly trimmed in the field and offer a wider nailing surface for speedy installation.
Always Consistent: I-joists are engineered and manufactured for reliability &#; you&#;ll receive the same carefully made, consistently performing, and professionally inspected product time after time.
Sustainably Made: A typical I-joist uses only about half the wood of dimension lumber. The raw materials used in the manufacture of BCI and AJS I-joists are sourced from sustainable and responsibly managed forests. Boise Cascade strives to maximize the use and minimize the waste of each log procured. Bark and material residuals are used for carbon-neutral biomass fuel to generate over 70% of the energy needed to manufacture our products, keeping our emissions and reliance on fossil fuels low.
I-joists are a go-to product for residential and multi-family construction projects because they&#;re available in common sizes for today&#;s construction projects. They can also reduce common mistakes and hassles to make: framing simpler, floors flatter, and homes perform to meet customer expectations.
The strength and stability of I-joists make them a popular choice for engineered floors and roof framing. I-joists come in longer spans than dimensional lumber but without the potential defects and imperfections that eat up time and labor at the job site. With less shrinking, twisting, and bowing, the result is simpler floor and roof layouts that perform over time. Their consistency and performance, along with proper design, helps reduce vibrations, which means less bounce, fewer squeaks, and solid, quiet floors.
I-joists consist of OSB web between two flanges, which are typically constructed of dimensional lumber or laminated veneer lumber (LVL) and joined by a durable structural adhesive. BCI® Joists use Versa-Lam® LVL for strength and durability while AJS joists have flanges made of machine stress-rated lumber.
A finished I-joist looks like the letter I, lending the product its name.
I-Joists are manufactured in a wide range of depths ranging from 9 ½&#;-24&#; and can be special ordered in lengths as long as 60 feet.
BCI Joists are available in standard depths up to 20&#; and AJS joists are available in depths up to 24&#;. The extra depths make an ideal solution for multifamily applications.
The answer to this question depends on many factors unique to your project. Download the BCI or AJS I-joist Specifier&#;s guide to see I-joist span chart for your specific application or learn more about the Boise Cascade software suite.
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
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
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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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