Many people will ask if insulation is necessary for their building. The only time that insulation is not recommended is when you are building a carport because there is no siding and no reason to insulate it. Otherwise, insulation is highly recommended for your structure.
Why You Need Insulation
Insulation will benefit you because it will keep the interior of your building comfortable and help the building last for much longer than without it. Metal building insulation allows the building to be cold in the summer and warm in the winter. It will also help your building from gathering condensation on the roof which leads to problems with rust down the road.