Help ID this joist 3

[RacingAZ]

Hope someone can help me ID this steel joist.

It looks like a Butler joist with very similar hat channels as chords (with lips) but the end is not quite the same. The joist has square ends and attached to the side of the girder joist.

Also, I was told that Butler's are typically spaced at 5' o.c. These joists are at 6'-4" o.c., 24" deep and 39' long. Location is in Phoenix, AZ.

Attached are some of the pictures. Thanks!

 

[RacingAZ]

more pics

 

[RacingAZ]

one more

 

[ajh1]

This is not a Butler joist. I can't identify it other than to know that it's not Butler's.

 

[jike]

Have you gotten joist tags from the joists? That will usually identify the manufacturer.

What year was the building built?

Macomber had a system which framed directly into the sides of truss girders with projecting studs on the end of joists that dropped into keyhole slots on the girder.

 

[SlideRuleEra]

It looks very similar to "Truscon" joists. See the attached file which is one page of the 1934 Pocket Companion. The complete book is available on this page of my website:

http://www.slideruleera.net/miscellaneous.html

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[RacingAZ]

Thanks for all the responses.

Al - That's what I'm saying. it's not a butler joist but the hat channel chords are nearly identical to what Butler uses with the lips on the flanges.

No tags on the joists and not sure how old is the building. I would say 1970's.

 

[stevenspm]

It is hard to tell but kind of looks like a Macomber V-Beam. See attached catalog.

 

[RacingAZ]

Thanks Steve, that's my guess also after jike mentioned Macomber as a possible candidate and found an old Structure magazine article about old joist systems.