What does TJI stand for?

TJI stands for Truss Joist I-Joist. The engineered wood I-joist can be used for joists or trusses, are stronger and lighter than dimensional lumber of similar widths, and can span greater distances. The truss-joists are engineered to resist twisting and warping, and won’t shrink like dimensional lumber.

Can you use I-joist for roof?

Some builders use manufactured I-joists not only to support floors, ceilings, and flat roofs, but also in place of either sawn-lumber rafters or wood trusses to support pitched roofs.

How far can TJI roof joists span?

[7] Maximum on-center spacing for bracing of TJI® 110 is 32″ o.c.; for bracing of all other TJI® joists use 36″ o.c. [8] Maximum clear span limited by scope of 2018 IRC Table 802.5.

What are TJI rafters?

Trus Joist® TJI® joists are a key part of making a high-performance floor. The dimensional stability of TJI joists help them resist warping, twisting and shrinking that can lead to squeaky floors.

How long can a TJI 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 2×12), 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.

How far can a tji span?

Can I-joist span 30?

Joists are available in several depths and lengths and superior strength allows them to span up to 30 feet (TRIFORCE span tables).

How far can 16 TJI span?


TJI-110 9-1/2″ 15′
TJI-210 9-1/2″ 15′ 9″
TJI-230 9-1/2″ 16′ 2″
TJI-110 11-7/8 17′ 10″

Can you drill holes in TJI?

Big holes in the middle are fine. In fact, you can put holes that go almost all the way from the bottom to the top of the joist. TJI, for example, say you just need to leave 1/8″ of webbing remaining! For people used to looking at dimensional lumber, these holes look very, very wrong… but they’re actually fine.