Anyone with a metal building in Pike, Spalding, or Henry County knows the two problems: in summer the inside is hotter than outside, and on cool mornings the underside of the roof sweats and drips onto everything stored below. Both come from the same cause. Bare metal has no insulation value and conducts heat and cold straight through.
Fiberglass blanket insulation was the traditional answer, but it sags, it traps moisture against the metal, and it does nothing about air leakage at the seams and fasteners. Closed-cell spray foam solves all three at once: it bonds directly to the metal, it's a vapor barrier at the right thickness, and it stiffens the panels noticeably.
We spray the roof deck and walls in lifts to the specified depth, working around purlins and girts so there's no gap for condensation to form. One to two inches stops the sweating; more gets you into the range where the building can be heated and cooled affordably.
If you're planning to insulate a building that isn't finished yet, call before the interior liner goes up. Foam applied to open framing is a straightforward job; foam applied after a liner is installed is a much harder one.