How to insulate metal roof on shed and avoid condensation?
You need to prevent air from getting to the metal. If no air circulation there is no moisture will condense on the inside. Spray on insulation works well but is fairly expensive, Fiberglas works but needs to be in contact to prevent air movement. This is one area that I compress the insulation some to make sure it stays in contact. This looses some of the R value But eliminates the sweating. Those are the 2 methods I have used.