Help ID this roof steel joist 8

[RacingAZ]

I would really appreciate if anyone here can ID this roof joist system It looks proprietary to me. The building is in NC. THANKS!

 

[RacingAZ]

Here's another shot.

 

[CELinOttawa]

No tags and no markings? What is the year of construction? It isn't likely that any of my Canuck books will be able to help, but a bit more info is going to be of great assistance to people down your way in trying to help.

 

[TehMightyEngineer]

Good luck with that, without original drawings or something calling out the original manufacturer and date of construction I'd say you either have to be super conservative or run the numbers from scratch. Have fun field measuring; been there, done that.

Maine EIT, Civil/Structural.

 

[msquared48]

Looks like Great West Steel Joists to me. Bought up by Canron a few years back.

If you can post the span and spacing, I can look and see what the ratings were. I believe that BAretired has another catalog too...

Mike McCann
MMC Engineering

 

[msquared48]

Here is the catalog. Don't know how readable it is, but if you need further detail, just post a question and I will look at my copy.

Mike McCann
MMC Engineering

 

[OHIOMatt]

It looks to me like this is a PEMB. I did a remodel on a Butler building last year and it looked very similar to this. They made their own open web joists (they may still).

 

[RacingAZ]

Thanks Mike!

Joists are 30" deep at 5' on center spacing. Span is 30'. No tags

 

[msquared48]

Can you reads the catalog on page 4? You will need to determine the depth and thickness of the hat section in order to see what alphabetical designation (page 2)to assign the joist to determine the capacity.

Let me know...

Mike McCann
MMC Engineering

 

[SteveGregory]

My vote is Butler PEMB. They call them Truss Purlins.

 

[SLTA]

Try the folks at the Steel Joist Institute.

http://steeljoist.org/joist-investigation-form

They'll poke through the catalogs and tell you what you have.

 

[SteveGregory]

If it is a Butler Truss Purlin, they are not SJI members. The Butler Landmark series always spaced them at 5'. If they are 29.5" deep (30"?) and have a 6.5" high bearing seat, I think you have a Butler.

I am in Virginia and have dealt with the Reidsville, NC Butler office a few times.

 

[jike]

The best way to determine it is to obtain a tag (or a couple) from the joists. There were some manufacturers that used hat section chords whose design did correspond to SJI standards. Are the diagonals rods or pipes? Never have seen pipes used.

You may have to measure it up and analyze. You would also need to know material strength.

Call Butler if you suspect it was theirs. SJI can also help.

Retired SE......

 

[RacingAZ]

I posted another response yesterday but it didn't show up, weird.

Anyway, thanks SteveG!

I now think this is a Butler truss purlins, with lips on the flanges and double diagonal webs toward the end/seat, identical to what SteveG posted.

I just contacted Butler.

Thank you everyone for all the help!

 

[ajh1]

Just to confirm what RacingAZ stated.
Yes, this is a Butler truss purlin. He communicated directly with me and now has the design data information for the joist in question.

 

[msquared48]

I stand corrected. Thanks for the info.

Mike McCann
MMC Engineering

 

[RacingAZ]

Thanks again Al!

I wish every PEMB mfr. is as responsive as Butler.

 

[ajh1]

Just a postscript and a shameless plug!
Butler has just introduced the Truss Purlin XT. This is an update to the existing truss purlins which uses a bolted joint rather than a welded joint between the web and chord elements. Members depths are 30", 34", or 40". Spans to 60'. These are designed per order for the specified design loads.

 

[RacingAZ]

Al, you've earned it. I know I'm not the only one that you've helped on this forum.

 

[GalileoG]

CELinOttawa,

What canuck books do you use to identify OWSJ in Canada? Would really be interested in finding out. Thanks!