How far can a 16 inch I joist span?

As part of building a durable deck, it's crucial to determine the number of joists needed to support your decking safely. This depends on the size of your deck and approved building permit plans.

The company is the world’s best i joist beam supplier. We are your one-stop shop for all needs. Our staff are highly specialized and can help you find the product you need.

If you've wondered, "Do I need a permit to build a deck?" the answer is almost always yes. Generally, larger decks require larger joists. For instance, joists spaced 16 inches from center to center can span 1.5 times in feet the depth of their inches. To learn more about deck joist sizing, spacing, and allowable span, consult this chart.

The location where you live is important in choosing wood for your joists. Not all wood species are available in every region. For example, California Redwood, Hemlock, or Douglas Fir are uncommon in the Southeast, while Southern Yellow Pine is rare on the West Coast.

There are also strength differences among Redwood, Fir, Pine, and other wood types. Check your local building codes to find out which species are available and, more importantly, their strength and spanning capabilities.

Even if you prefer the look of Redwood, it may not be the strongest material available. Treated Hemlock or Pine may be better options and can be stained to match your aesthetic. The key factors are strength and span!

The standard deck joist span varies based on the size of your deck and the materials used. Deck joist spans can range between 6 ft, 10 inches, to 18 ft, depending on the size of the deck, the spacing of joists (12 inches or 16 inches from center to center), and the type of deck boards used.

Use our calculator above to determine the right joist span for your deck based on wood type, joist size, and spacing.

When you choose Trus Joist, you're choosing a brand that:

• Invented the first I-Joist over 50 years ago
• Leads innovation and design to create Engineered Wood Products like I-Joist, LVL Microllam, LSL Timberstrand, and PSL Parallam
• Pushed the limits of span charts to make open floor concepts a reality
• Has been the #1 used I-Joist for the past 14 years
• Is one of the most trusted brands in the building community today

Trus Joist: The Only Choice.

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 an impressive 32' without support, allowing builders to create open floor plans that customers demand.

LVL Flange

An LVL flange is crucial for high-performing floors as it prevents squeaky floors by holding fasteners better and resisting shrinkage due to moisture changes.

Engineered for Consistency

All TJI Joists are perfectly straight and won't twist, warp, or cup.

Allow for Spacing for HVAC, Electrical, and Plumbing

Large holes can be cut in the webbing of TJI Joists, facilitating the installation of mechanicals. Joists can also be spaced wider than traditional solid-sawn joists, allowing for quicker and easier installation.

Fast and Easy Install

Contact us to discuss your requirements for door skin plywood. Our experienced sales team can help you identify the best options.

All TJI Joists are designed using patented software that creates a custom floor layout for every home. This results in minimal cutting and clear instructions for the carpenters on the job site.

For more information, visit the Trus Joist I-Joist Product Page, Trus Joist I-Joist Installation Guide, Allowable Holes I-Joists & Beams, Trus Joist I-Joist Spec Sheet, and Trus Joist I-Joist Warranty.