Vapor Barrier

Vapor barrier is an insulation that is installed in the roof system only. It's purpose is to absorb any condensation that may form on the underside of the roof panels to prevent  moisture from accumulating with in the storage units.

The absorbed moisture evaporates and is released back into the atmosphere. The condensation that may occur in steel buildings depends on the humidity level in your area. Vapor barrier is most commonly used in regions with higher humidity levels, not in dry arid regions.

Your vapor barrier quote will be shown separately on your proposal under options.