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Old 03-08-2012, 08:16 PM   #1
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Floor joists

When did new construction start useing 1/2 in pressed board with what looks like 2by2 strips on top and bottom for floor joists in a two story home for the upstairs floor. I guess this is as strong as 2 by 6 or is it?


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Old 03-08-2012, 08:22 PM   #2
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For quite a while they are called engineered I Joists and are very good and strong they can span farther distance then 2x10's or 2x16's the web is the strength to it just don't cut to much out of it your fine. I have them in my Home I spec'ed it out that way saved me a bundle.


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Old 03-08-2012, 08:53 PM   #3
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Depends on the size of them as to there strength. We use em all the time. Although cost more than 2x10's
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Old 03-08-2012, 09:02 PM   #4
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they have been around since the late 70's i believe. TJI's as there calle along with OJT'S (open joist truss) are standard practice for new construction.. with more and more homes being designed with the open concept,, longer spans are required.

conventional lumber is still in use but not too often
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Old 03-09-2012, 07:15 AM   #5
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Engineered I-joists are incorporated if a construction/structural design is to have greater spans of open space without requiring support (walls, columns, or posts).
We are talking longer spans that cannot be easily or typically accomplished (built) using typical 2x conventional lumber at 16" O.C.

That is the main difference with the purpose-use of incorporating Engineered I-joists vs. Conventional Lumber. There are other reasons or conditions where the joist may be used (see link below).

More Information is Covered Here - including the history of use in the construction industry: http://en.wikipedia.org/wiki/I-joist
- Build Well -
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