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Existing Bar Joist

Existing Bar Joist

Existing Bar Joist

Was wondering what this joist likely is.

25 year old building.

Ground Snow 25 psf
Centeral N.J.
26" Deep
40' Span
6'-3" o.c. spacing typ.
bottom chord - 1 3/4 x 1 3/4 x 3/16
web rods 7/8" diameter

That's all the info. I have at this time.

Thanks in Advance!

RE: Existing Bar Joist

Look at the ends of the joist.  You should find a metal tag on one end.  Get the info from that tag and contact the manufacturer.  If manufacturer is not identified or tags are not there, then consult the Steel Joist Institute's 60 year joist manual which will help you find your info.

RE: Existing Bar Joist

If you don't find any information, field survey the joist members and model it with some appropriate software.   

RE: Existing Bar Joist

I agree with what has been posted, but my guess is that it is an "H" joist.  "K" joists did not become common until the late 80's.


RE: Existing Bar Joist

You can provide information to SJI and they could provide suggestions on what the joist is.


But in order to verify model this in a 3d analsyis program to confirm the capacity of the suggested joist size.


All that is necessary for the triumph of evil is that good men do nothing.
    Edmund Burke


RE: Existing Bar Joist

Or buy the book from steeljoist.org - one of the better $60 or $70 I have spent....

RE: Existing Bar Joist

Most of the books I've found for the 70 year joist catalog, etc. did not indicate chord sizes or web shapes. That is why I suggested the investigation tool. You can also ask for typical fabrication shapes for different joist types.

All that is necessary for the triumph of evil is that good men do nothing.
    Edmund Burke


RE: Existing Bar Joist

I have had personal experience with this and used the forms on the SJI website.  Follow the link that RCraine has posted above.  They got back to me with in a few hours and even provided answers and information to follow up questions.

RE: Existing Bar Joist

Thanks for the feedback!

I did reach out to steel joist and submitted online.  They got back to me in 20 minutes.  They felt it was likely a 26K10 joist with the information I provided.  I was thinking it was a 26K6 or 7.

Trying to find a source for common bar joists and their component sizes.  Do the 60, 70 year joist catalog's provide this information or is their a better resource?

RE: Existing Bar Joist

The historical bar joist catalogue doesn't usually provide component sizes.  You'll get joist sizes and capacities for different spans.  
I think the practice for the manufacturers is that they use whatever components (angles, bar, etc.) they can get to provide stated capacities.  So it's impossible to specifically define these.

RE: Existing Bar Joist

I still don't think K joists existed 25 years ago.


RE: Existing Bar Joist

We just ran into a similar issue and found that SJI was able to provide typical components for suspected joist sizes.

The 60 year joist catalog will provide if they were around 25 years ago.

All that is necessary for the triumph of evil is that good men do nothing.
    Edmund Burke


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