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Keene Super C Steel Joists?

Keene Super C Steel Joists?

Keene Super C Steel Joists?


We are just getting involved in a new job where we were provided existing drawings and the floor and roof framing are denoted "As Keene Super C Steel, 1200 J14 24" o.c. and As Keen Super C Steel, 1000J15 24" o.c." respectively. Has anyone heard of Keene Super C Joists? I am fairly sure unless I can find some manufacturers literature we are going to have t go measure some joists and then utilize AISI to determine some capacities. There are a few end games at consideration. One is to add a partial mechanical penthouse above the roof, the second is to re-roof the building. The county has already required an analysis showing that re-roofing the building will not cause any structural issues.

Building is essentially a large box, 488'-8" long by 45'-4" wide with interior and exterior load bearing walls on the short dimension. Every 40' along the length of the building there are full height CMU walls that extend above the roof and act as party/fire walls. Essentially creating individual units that are 45'-4"x40'-0". The building has one floor on grade, one elevated floor and the roof level.

RE: Keene Super C Steel Joists?

Have you contacted SJI? Fill out the Joist Investigation Form and they'll get back to you with whatever they have. It's a great service - fast and free. .

In the meantime, when was the structure built? You may find something useful in the 75-year joist manual (or 60-, or whatever you have in your office).

RE: Keene Super C Steel Joists?

I did contact SJI. They have never heard of that call out ever. Actual response was "Never". It actually appears that they are CFS joists, so I guess I may go to AISI next, however, I do not believe they have as good of historical records as SJI does. Just trying to poll the elder statemen on this board to see if they every saw the callout. This does appear to be a job where it was specified by the architect and no structural was involved.

RE: Keene Super C Steel Joists?

Are you sure they're not 12 inch deep cold formed shapes? I wasn't clear if you'd been to the building or not, but flying blind, we used J for a cold formed "joist" before.
Keene was a company in West Virginia. Admittingly, the 40 spans seem long for 12 inch joists.
Here's some load Tables from MarinoWare.

RE: Keene Super C Steel Joists?

Jed, yes that is what we were thinking is that it was CFS joists and not structural steel joists. We have not been into the building yet, but were provided with "structural" drawings. I was told by someone else that the 1200 is probably a 12" CFS joist, but we were both stumped when discussing the 14 versus 15 part of the call out. The joists actually only span 22'-8" to a center bearing wall. The 40' dimension is in the opposite direction.

RE: Keene Super C Steel Joists?

The 14 or 15 might be the gage. If they were using the same gage system as now, the floor joists would be .0747 inch thick vs. the roof joists which would be .0673 inch thick. These would be close to a 1200JRxxx-68 (.0713 inch thick; where the xxx represents the leg length), good for somewhere between 55 and 65 psf at a 24 inch spacing.
You lucked out, OWSJ would be much tougher to check and work with.

RE: Keene Super C Steel Joists?

Jed's idea makes sense and is where I was leaning as I read through the posts. I wonder if the 'J' designation means they aren't punched?

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