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HumbleChief

Anyone Use TJI's For Ceiling Joists?

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Seems like a weird question but I can't find a table for TJI's as ceiling joists, only floor and roof. Anyone with any experience with same?

 

Thanks

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8 minutes ago, Joe_Carrick said:

What is your span and loading.  I can run it thru Strucalc.

Thanks Joe but really only need a simple span table that I can refer to. Span is 20 ft but I think as soon as I add any kind of calc I suspect I'll need to justify the load/span as you suggest.  Just can't find a TJI span table for ceiling joists. San Diego County span tables show 2 x 8's will work but we'd like to use TJI's without having to calc the span. Funny I've never run in to this before..Thanks again

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THANK YOU JOE - looked for something like that all morning!! Over and above - really appreciate it!

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30 minutes ago, HumbleChief said:

THANK YOU JOE - looked for something like that all morning!! Over and above - really appreciate it!

I just googled "tji ceiling joists" ;)

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2 minutes ago, Joe_Carrick said:

I just googled "tji ceiling joists" ;)

Well you know how that goes when someone else googles what you googled all morning - piece of cake. It's like having the wife finding the tool you misplaced, even when it's right in front of your face...but thanks again...

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Does the manufacturer of the joists you are using have any software tools for this?  I use Forte software for checking the spans of Weyerhauser engineered products before I send my plans to the engineer.  Your brand might have something similar?

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Thank Bill, Thanks Kevin Rod,

 

The link that Joe provided and that Bill posted a pic of will work great for my purposes - assuming that the TJI company has already done the necessary calcs..

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A good thing about using truss joists rather than solid lumber is that you

may cut very large holes through the web, mid span, which allows running

ducting etc.

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18 minutes ago, JJohnson said:

A good thing about using truss joists rather than solid lumber is that you

may cut very large holes through the web, mid span, which allows running

ducting etc.

... and they are straight too.

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2 hours ago, JJohnson said:

A good thing about using truss joists rather than solid lumber is that you

may cut very large holes through the web, mid span, which allows running

ducting etc.

The not so good thing is that they cost a whole lot more around here than 2x10's.  I uesd to design homes with TJI's all the time, but that was in northern BC where there was a lot of oil money and big homes.  Now on Vancouver Island I'm dealing with much more limited budgets and smaller homes, and 2x10's are just the standard go-to.

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Biggest advantage of I-joists is warranty call backs.  I-joists don't shrink.  The lumber yard most of my builders use pre-cuts the entire floor package.  Everything is cut and labeled.  The framers just have to cut rimboard.

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Squeezing the ceiling joists into the space at the birds mouth can be tricky too. If you cut away too much off the top of the TJI because your roof rafters are smaller than the ceiling joists, you need to reinforce it with squash blocks nailed to the web. Make sure you check your section/detail at that connection.

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