If you're hanging this from the ceiling of your garage, you're most likely referring to trusses vs. studs. Trusses form your roof, and the bases of the trusses form your ceiling. They're usually spaced 24" on center, with the first truss (gable end) flush with the outside wall. (Meaning you're losing 1 1/2" or 2" if pulling tape off a sheetrocked wall)
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