I-Joist Identification

[XR250]

Trying to determine the capacity of a residential floor system from 1991.
11 1/4" I-joists @ 16" O.C. spanning 20'-7". The webs are 3/8" plywood (not OSB) and the flanges appear to be SYP 2x4's.

Does anyone have a resource for I-joists this old?

 

[phamENG]

Legacy Trus Joist TJI 15, 25, 35, 35X, 55 DF SP Literature (1985-1997)

 

[ChorasDen]

Where is the project located, what state? May affect what manufacture makes sense to check. I don't believe it's Trus Joist due to the sawn flanges (unless project is located in New England, and then it's a maybe), but looking at the web splices may give more information.
Tough to be sure, but looks like there may be some stamping on the web there on the second joist down?

My bet is Roseburg, but that's a guess from the photo only.

 

[ChorasDen]

To add, the resin doesn't appear to be Boise Cascade (don't know if they ever used solid sawn flanges). Boise Cascade does not use the dark colored phenol-formaldehyde resin, but it's possible they may have in the past.

 

[XR250]

I'll check them out. The markings on the web only identified the web as 3/8" 24/0 plywood.

Thanks