mjr6550 Posted May 15, 2017 Report Share Posted May 15, 2017 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? Quote Link to comment Share on other sites More sharing options...
Rob Amaral Posted May 16, 2017 Report Share Posted May 16, 2017 Where is this? Elkhart Indiana???? Maybe the guy worked at a motor-home factory.. Quote Link to comment Share on other sites More sharing options...
Greg Booth Posted May 16, 2017 Report Share Posted May 16, 2017 .............in the late 60's, Ryan homes was experimenting with all metal framing, similar to what you're pic shows. I know of only 4 homes done in one of their developments in a Rochester suburb..........Greg Quote Link to comment Share on other sites More sharing options...
Tom Raymond Posted May 16, 2017 Report Share Posted May 16, 2017 Ryan still can't build a decent house with conventional framing. They have no business experimenting with unconventional components. 1 Quote Link to comment Share on other sites More sharing options...
Jerry Simon Posted May 16, 2017 Report Share Posted May 16, 2017 What is your concern, other than the apparent rareness of such? After 45 years or so, are they failing? Quote Link to comment Share on other sites More sharing options...
mjr6550 Posted May 16, 2017 Author Report Share Posted May 16, 2017 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. Quote Link to comment Share on other sites More sharing options...
Jerry Simon Posted May 17, 2017 Report Share Posted May 17, 2017 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. Quote Link to comment Share on other sites More sharing options...
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