When you choose Trus Joist, you're choosing the brand that:
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-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
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
If you want to learn more, please visit our website I-Joists for sale.
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
Floor Plan Takeoff Process
Sample Floor Plan Layout
Minimum Criteria Span (per code)
Fiber Source
I remember the first time I saw engineered I joists used in a job here in Cincinnati. I would be willing to bet $500 that it was in the late 's. They were the floor joist components of a mini-condominium project. One of the condo units was half finished and the owner had abandoned the project. I was considering purchasing the condo to finish it out for resale. I didn't buy the condo - the reason had nothing to do with the floor joists although I must admit I had my reservations about the seemingly undersized structural material!
The next time you pass buy a commercial building under construction or you can view a traditional I beam up close, I want you to really look at the way one of those is made. Look at how thin the steel web or center portion of the beam actually is. Often they are just slightly thicker than 1/4 inch! I then want you to imagine how much weight one of these single beams can carry. Note that the beams don't have to be 1.5 inches thick - the thickness of a standard floor joist - to do the job.
It should come as no surprise that wood I beams can copy the same format as steel I beams and do so with predictable, consistent strength results. This is exactly how engineered wood I joists were born.
The stiffness or load bearing capacity of a beam (steel or wood) is a function of the distance the beam spans, the type of material it is made from, and the depth or height of the beam. You can demonstrate this very easily.
Imagine framing a floor using 2x4's as floor joists. If you made those span a typical 13 foot space, I don't know if I would walk across the floor. If it didn't collapse under my weight, it would most certainly sag! Now, substitute 2x12 joists in the same system. You and I both know that the floor system will be as strong as can be and 30 people standing on the floor probably would make little difference. The strength of the floor system increased at a faster rate than the depth of the joist material. In other words, the difference in depth of the joists increased by about 3.5 times, but the strength of the system increased possibly by a factor of 20 or more. All of this simply because we increased the depth of the joist or beam!
The new engineered floor joists can be purchased in a variety of depths that range from 10 inches to 16 inches. Each depth can be purchased with different top and bottom flanges as well. All of these things factor into the allowable distances you can span with each type of joist.
If you want a stiff floor, you simply go with a deeper floor joist or shorten the span of the floor joist. All of these considerations should be done by a structural engineer who designs floor systems. Don't even think about trying to guess what size you need!
The engineers who design I joist floor systems use very sophisticated computer programs that were developed by the floor joist manufacturers. The engineers simply have to enter in certain data about the size of the house and the anticipated floor loads and BINGO! out comes the recommended floor joist size. Don't even bother about asking to get this software. It is only available to engineers and lumber company professionals who are trained how to use it. Floor design is NOT a DIY project.
The APA PRI-400 standard makes engineered wood I joists easy to specify and order.
I joists install much in the same manner as traditional wood floor joists. There are several things you must do to insure a fault free installation, however this can usually be learned in several hours. No single detail is very complicated. All of these details are illustrated exceptionally well in a FREE booklet that is offered by the APA. Visit the Engineered Wood Association's web site at www.apawood.org and check under publications for information that can be downloaded.
I joists are available in deeper depths than standard floor joists. The largest standard floor joist is a 2x12. You can order I joists in depths up to 16 inches! This allows you to span greater distances which normally translates to wide open spaces.
I joists are also more consistent in size and shape than traditional floor joists. Some new flooring materials (laminate flooring) can't be installed over traditional floor joists that have different height crowns. You don't have this problem with I joists! They are true and straight all of the time.
I joist span design standards make them a stiffer floor. This can help reduce squeaks. It also makes a more solid floor. I joists are superb. Give them a serious look!
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