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##### Asked by: Lhoussaine Heusner

business and finance construction industry# How far can floor trusses span?

Last Updated: 5th January, 2020

**floor**and rafter

**truss**systems have been used with outstanding results for over 15 years by designers and builders. Design Versatility. The long

**span**capacity - up to 8 metres or more - offers functional design freedom and

**can**eliminate the need for interior support walls and beams.

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Keeping this in view, how far can a truss joist span?

Those maximum distances vary based on **joist** strength, depth, and on-center **spacing**. According to **TJI's span** table, switching to deeper 11-7/8 inch **joists** (a nominal 2x12), even when spaced at 19.2 inches on-center, enable you to go as long as 17 feet, 4 inches and still achieve L/480.

Likewise, how far can a beam span without support? When supporting joists that span 12 **feet** with no overhang beyond the beam, a double ply beam can span in **feet** a value equal to its depth in inches. A double 2x12 beam can span 12 **feet**; a (2) 2x10 can span 10 **feet** and so on.

Subsequently, one may also ask, how far can floor joists span?

How **do** I keep them even? In general terms, **joists** spaced 16 inches on center **can span** 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet.

Are floor trusses stronger than joists?

**Floor trusses** can span farther between bearing points **than** I-**joists**, allowing for larger open rooms. This also reduces the need and cost for extra bearing posts, beams, and footings. **Floor trusses** have built-in openings, which can be used to install HVAC ductwork, plumbing lines, and electrical wiring.