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1975 house. I have never seen this before. I could not find any markings on the joists. The odd cross-section makes me think they were manufactured for some other purpose and were surplus. Anybody seen these or have an idea what they may be?

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On one hand, they look fine. However, I was hired as an engineer to state that they are fine. Nothing is that easy for engineers. Considering the very narrow webs and the lack of any blocking or bridging, I question how they would perform if truly loaded to a design load, or with a concentrated load. Also, I question the performance should a fire occur. they may perform far worst than I-joists, which now have special requirements for protection from fire. 

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6 hours ago, mjr6550 said:

Also, I question the performance should a fire occur. they may perform far worst than I-joists, which now have special requirements for protection from fire. 

I agree; they'll warp/twist.  That's why I prefer a wood beam in most cases versus a steel beam.

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