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Ten years ago, when my company was building its office, showrooms, and warehouse, I had to find a way to frame the floor over a 40-foot-wide span. I considered using open web floor trusses, but I wasn’t crazy about the price and they weren’t readily available. The salesperson at my local lumber supplier called my attention to wood I-joists, a product they’d recently begun to carry and support. Sufficiently impressed with the apparent capabilities of this new (at least to me) technology, I decided to give it a try, and I haven’t had a moment’s regret — we’ve since used I-joists exclusively for all of our floor framing. There’s no reason I can think of not