How far can you span a TGI? 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.
Full Answer
What are the requirements for a TJI joist flange?
TJI®joist flange must bear fully on plate. Birdsmouth cut must not overhang inside face of plate. Variable slope joist hanger. See pages 22 and 23. Beveled web stiffener required each side. 1⁄3 1 3 1⁄3 ½ ½ Maximum allowable V-cut Allowed hole zone 1⁄3 1 3 1⁄3 Birdsmouth Cut Allowed at low end of joist only
What are the dimensions of a TJI diaphragm?
TJI® Closest On-Center Spacing per Row(1)(2)Diaphragm Design Information 8d (0.113" x 2½"), 8d (0.131" x 2½"), 10d (0.128" x 3"), 12d (0.128" x 3¼") 10d (0.148" x 3"), 12d (0.148" x 3¼"), 16d (0.135" x 3½") 16d (0.162" x 3½") Equivalent Nominal Framing Width Maximum Allowable Seismic Design Capacities(4)
What is the maximum cantilever length for a TJI®joist?
See Section A of cantilever table on page 11 TJI®joists may be cantilevered 5" to 24" when supporting roof load, assuming: ■simple or continuous span ■L 1≤ L 2 ■minimum backspan = 2x cantilever length 2'-0" 5" to 24" Roof truss span 40 psf live load L2 1
What is the fastener spacing for TJI®joists?
Fastener spacing for TJI®joists in diaphragm applications cannot be less than shown in table. When fastener spacing for blockingis less than above, rectangular blocking must be used in lieu of TJI®joists. (2) For non-diaphragm applications, multiple rows of fasteners are permitted if the rows are offset at least ½" and staggered.
How far can you span a TJI joist?
[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.
How far can a 16 TJI span?
TJI–TRUSS JOIST P/STJICHORD DEPTH16" O.C. MAX SPANTJI-1109-1/2"15'TJI-2109-1/2"15' 9"TJI-2309-1/2"16' 2"TJI-11011-7/817' 10"6 more rows
How far can you cantilever a TGI?
TJI® joists are permitted to be cantilevered up to 1/3 the adjacent span if not supporting concentrated loads on the cantilever. Cantilevers exceeding 4 feet may require special consideration.
How big of a hole can you put in a TGI?
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.
How far can 11 7 8 I-joist span?
Span refers to the length of the I-joist. The L/480 table with a 40 per square foot live load and a 20 per square foot dead load with a depth of 11 7/8 inches will give you spans according to joint weight. With these factors, the lightest joist will have a maximum span of 17 feet, 8 inches.
Can floor joists span 16 feet?
Floor joist span is the length of an individual joist, from the foundation walls to an interior beam. The spacing between joists is typically 16”, but can also be 12”, 20”, and 24”. The spacing and ability to span a greater – or smaller – distance is dependent on the size of lumber used for the joists.
How much can you cut out of a TGI?
All holes larger than 1 ½” must be spaced at least 12” from the edge of the hole to the inside face of bearing. Although cutting holes larger than 1½” in TJI® joist webs near end bearings is not permitted in the table, we recognize that this condition does arise.
Can you notch TJI?
TJI product can only have one notch per joist member. Notch will only be analyzed when the length parallel to the joist member span does not exceed 4 inches.
What does TJI stand for?
TJIAcronymDefinitionTJITransitional Justice Institute (University of Ulster; Ireland)TJIThe Journey Inside (Intel education software)TJITribal Judicial Institute (University of North Dakota; Grand Forks, ND)TJITrus Joist I-Joist (engineered floor and roof joist; trademark of Trus Joist, a Weyerhaeuser Business)3 more rows
Can you run waste pipe through joists?
Can a waste pipe go through a joist? Running waste pipes through joists should be avoided where possible, as any drilling of joists (also known as notching joists) may weaken them and compromise the structural integrity.
How big of a hole can you cut in AI joist?
According to WIJMA, Holes not exceeding 1/3 of the depth of the web in any dimension are acceptable in most I-joists, and they may be round, square, or rectangular. Holes must be placed in the center third of the vertical depth of the web.
Can you run drain pipe through joists?
Running drainpipe through joists calls for meticulous work. The holes must follow a straight line across the floor and must ascend or descend so the pipe will be sloped 1/4 inch per foot. (If joists are 16 inches on center and pipes run across them at a right angle, holes should differ in height by about 3/8 inch.)
About the author
I'm full time builder for a large construction company in New Hampshire. I run their design-build division that specializes in custom homes, commercial design-build projects and sub-divisions. I'm also a licensed civil and structural engineer with extensive experience in civil and structural design and home construction.
Not what you're looking for?
Search for more articles here. Enter keywords like, 'insulation' or 'kitchens' etc to find your topic.