In article , stryped wrote:
My detached garage with metal siding has 2x4 trusses spaced 4 feet on
center. Can I install a ceiling or will this be too much weight and
cause sagging/or other problems?

If the trusses are spaced 4' on center, you have much greater worries than any
ceiling you might put up there. That's *much* too far apart to adequately
support the *roof*.

Did you mean 2' on center?