Goto XINFUSHI to know more.

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. 

 

 

To Submit Blueprints for Takeoff's - Click Here

 

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

        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)

 

 

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For more i joist beaminformation, please contact us. We will provide professional answers.

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Spacing of Wood I Joists

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Spacing of Wood I Joists

Spacing of Wood I Joists

spsiegel

(Structural)

(OP)

3 Dec 12 15:38

We are considering spacing Wood I Joists at 24" centers for material efficiency and LEEDs points, and will obviously select so that the numbers work. But does anyone have war stories or cautionary tales about their use at this wide spacing? We will glue/nail, and select a 7/8" span-rated subfloor. Other considerations? Thank you in advance!

Replies continue below

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RE: Spacing of Wood I Joists

BAretired

(Structural)

3 Dec 12 16:50

For roof joists or trusses, 24" spacing works well. For floors, 16" or 19.2" spacing is more common. If the deck is stiff enough, I suppose 24" works okay for floors.

BA

RE: Spacing of Wood I Joists

TXStructural

(Structural)

3 Dec 12 17:06

LEED is a poor reason to select a construction material, but that's just me. USGBC has no concern about whether the building will be efficient, reusable, nor safe. If the choice is made for the properties of engineered wood, go for it. You can find the right combination of span, depth, and spacing using the manufacturer's reference. I have found these to provide good guidance for all kinds of engineered wood.

Whether 7/8" subfloor is adequate is a matter for debate, depending upon what the floor loads and finish will be. Keep in mind that ASCE 7 requires strength for point loads, not just distributed loads. Sound transmission, deflection, and vibration all can be real issues with longer spans, wider spacing, and shallower framing.

Once you establish that they can take the loads and you can have adequate openings for utilities and services, and that the serviceability requirements can be met, you probably have an adequate design.

RE: Spacing of Wood I Joists

spsiegel

(Structural)

(OP)

3 Dec 12 18:20

Gentlemen,

I know what is common; we have specified wood I joists at 16" centers for a decade or two. Rather I am seeking commentary from someone who has spaced I joists at 24" and has experience to share. I have not selected a material because of LEED, I have chosen the spacing. I can read references and apply normal engineering practices but would love to hear war stories from those who have used this material as I'm describing. In my experience changing a detail of material use often introduces practical issues I haven't thought of. Thanks.

RE: Spacing of Wood I Joists

cap

(Civil/Environmental)

4 Dec 12 12:36

Make sure you select a rigid sub-floor and glue-nail as you indicate with specifications. Floor Squeaks may result if the istallation is done wrong.

RE: Spacing of Wood I Joists

Archie264

(Structural)

4 Dec 12 13:00

>>>I have not selected a material because of LEED, I have chosen the spacing.<<<

LEED dictates joist spacing?

RE: Spacing of Wood I Joists

BAretired

(Structural)

4 Dec 12 14:19

1F24 Subflooring is a recognized standard in the Wood Design Manual published by the Canadian Wood Council. I would not expect any war stories about its use. The reason it is not used more frequently is perhaps because a thicker, hence more expensive deck is required to span 24" instead of 16" or 19.2".

BA

RE: Spacing of Wood I Joists

RFreund

(Structural)

4 Dec 12 19:33

The only reason I don't like that spacing is because (in my mind) you seem to start to loose the redundancy. Like when the electrician/plumber/ceiling installer starts putting holes/notches/fasteners into the flanges you start to loose some strength/stiffness. I'm sure some or most of this is covered by the allowable stress that we use in design however when I see joist spaced 24" oc and a large emt strap driven into the bottom chord, it just doesn't look right. Another consideration is distribution at large dead loads (interior walls, bathtub, fridge, etc.). However I don't think these things would prevent me from using 24" spacing, just some thought... Its done all the time with trusses.

EIT
www.HowToEngineer.com

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