Is I-joist stronger than 2x10?

A quick search reveals that I-joists generally offer higher strength-to-weight ratios than traditional 2x10 lumber. They enhance stability and span capabilities, making them a popular choice in modern construction.

Choosing between 2 x 10 and engineered wood products such as I-joist or open joist TRIFORCE® for your project can be a daunting task. It is essential to understand that engineered wood presents numerous advantages that shouldn't be overlooked.

Engineered wood has transformed the residential construction industry since its introduction nearly 50 years ago, offering improved uniformity, stability, and strength compared to conventional dimensional lumber.

Engineered wood floor systems

The advent of engineered wood has significantly changed floor systems, allowing builders to design longer spans and larger open spaces that are now commonplace. In fact, the average square footage of homes has been steadily increasing for years.

When compared to solid sawn lumber, both I-joist and TRIFORCE® floor systems exhibit superior strength and precision. They are not only lighter but also stiffer and easier to handle. Furthermore, they provide a more extensive nailing surface for attaching the floor membrane than the typical 2 x 10.

Adjustability

Like the 2 x 10, I-Joist and TRIFORCE® can be adjusted on-site, which is a major benefit when dealing with variable distances between bearing points. Any necessary corrections in joist length can be made immediately without needing approval from an engineer.

Using the floor cavity to run MEP

Engineered wood also allows builders greater ease in running mechanical, electrical, and plumbing systems within the floor's cavity. This design eliminates the need for bulky enclosures around plumbing or HVAC systems, enhancing room flexibility.

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Important distinction between I-joist and TRIFORCE®

It’s important to note the key differences between I-joist and TRIFORCE®. The I-Joist has stringent conditions concerning the use of the floor cavity—specifically regarding the number and size of holes drilled into the joists—while TRIFORCE® maximizes flexibility with its unique triangular webbing. This enables more efficient installation of mechanical systems and reduces overall installation time for plumbing, electricity, and HVAC.

If you're interested in the benefits of engineered wood and want to learn how TRIFORCE® enhances these advantages over I-joist, be sure to download our specification guide. Don't forget to check out TRIFORCE® joists span tables.

Triforce Open Joist

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Lew:
I recently faced a similar decision while building my two-story home. Despite having the option for 7 1/2' TJI's due to the span requirements, I opted for 2×10 Doug Fir since there was limited space for plumbing. I purchased quality lumber from my local supplier (not H.D.) and experienced few issues with culling. The 3/4 T&G OSB over the 2×10's spaced at 16' centers felt sufficiently rigid, with my longest span measuring 16 feet. However, I noticed the TJI's felt somewhat bouncy in the few floors I tested. Hope this insight helps.

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