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As an alternative to I-Joists, you might want to look into a roof truss system designed to include storage. The roof framing and attic floor framing are all one assembled piece which would simplify...

According to the Forest Products Supply Company website 11-7/8 inch TJI 560 I-Joists can span 22'-4" spaced 19.2 inches apart or 23'-8" spaced 16 inches apart with a 40 psf live load and 20 psf dead...