Are there any problems with TGI floor joists?
TGI floor joists. We hired a home inspection who said that there were several problems including the use of too many metal fasterners, a patchwork of subfloor (in some sections the subfloor spans only two joists), no use of bracing sections, etc. We suggested that we hire a structural engineer.
What is a TJI floor?
TJI is a specifc product, made by Truss Joist MacMillan, out of Boise, ID. A lot of people use the term TJI as a generic phrase for any manufactured I joist, of which there are a few. Michael you may have to pull up the flooring to find the manufacturer.
What is the difference between Tji and 2×12 floor joists?
The stiffness of a 2×12 regular floor joist can be less than half the stiffness of a 11.25″ deep TJI. The fire issue is certainly a problem but we find that most people are finishing basements today so a layer of drywall will certainly improve the fire rating drastically. The cost difference really isn’t a big deal.
How far can a TJI floor span?
A TJI 16″ deep and spaced 16″ o.c. can span about 26 feet! The second biggest perk is how little I-joists flex, and if you’ve ever installed ceramic tile, you know how important that can be.
What is a TJI floor system?
Engineered to provide strength and consistency, Weyerhaeuser's Trus Joist® TJI® joists are one of the most fundamental components of a solid, high-performance floor system. And with their light weight and long lengths, TJI joists are faster and easier to install than traditional framing, which can save time and money.
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
What is a TJI in construction?
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.
How far can TJI floor 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. 2 and 2015 IRC Table R802.
Are I joists stronger than timber?
Are I joists stronger than timber? I joists are specifically designed to offer strength in areas that dimensional lumber is incapable of. They can span greater distances, and are considered to be 50% stiffer than dimensional timber under traditional frame spacing.
Are floor trusses stronger than joists?
Pros: Span longer distances than traditional joists, removing the need for walls in some areas. Lighter weight. Stronger than traditional joists.
What is an I-joist floor system?
I-joists are strong, lightweight, "I" shaped engineered wood structural members that meet demanding performance standards. I-joists are comprised of top and bottom flanges, which resist bending, united with webs, which provide outstanding shear resistance.
How do you install TJI floor joists?
1:392:58Detail #A2 / A2W - Trus Joist EWP Floor Installation Guide - YouTubeYouTubeStart of suggested clipEnd of suggested clipNow once the TGI joists are in place toenail. Them to the plate using 1/8 d nail through each sideMoreNow once the TGI joists are in place toenail. Them to the plate using 1/8 d nail through each side of the bottom flange. And into the plate at least one and a half inches from the end of the TGI.
Can you drill through 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.
Can you nail into TJI joists?
Squash Blocks to TJI® Joist Fasten at each joist with two 8d (0.113" x 21⁄2") nails minimum (see Warning on cover). Protect untreated wood from direct contact with concrete Joist must be laterally supported at cantilever and end bearing by blocking panels, hangers, or direct attachment to a rim board or rim joist.
Can floor joists span 24 feet?
What size floor joist to span 24 feet:- as per general rules and guideline, a 2×12 (2-by-12) size of floor joists made of southern yellow pine, graded as #1 can allows joist spans up to 24 feet for a live load of 30 pounds per square foot and dead load of 10 pounds per square foot when spaced 16 inches apart.
Can you drill holes in I-joists?
You can drill the holes anywhere along the length of the joist (first photo). If you have manufactured I-joists, you can drill holes up to 1-1/2 in. diameter almost anywhere in the web area (the area between the flanges).
What are the advantages of TJI joists?
TJI’s offer many benefits compared to traditional dimensional lumber joists including: almost no twisting or warping, very little dimensional shrinkage, stiffness and strength. Framing a floor with TJI’s is really no different than framing with dimensional lumber.
How wide are TJI flanges?
TJI’s are available in many different sizes ranging from 9-1/2″ to 16″ deep and flanges 1-3/4″ to 3-1/2″ wide.
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.
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What is an open web floor truss?
Open web floor trusses are constructed with 2 x 4’s on top and bottom with a sort of “web” in between secured with metal plates. The open space is ideal for running wires, pipes and utilities. I have these in my home, and I use the space for extra storage as you can see in the picture.
Why do I like TJI web trusses?
Score one for the environment. The only reason I like TJI’s more is that web trusses will flex more, and I’ve really come to value a floor with limited deflexion.
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