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Aluminum floor joists

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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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