Close attention must be given to the interface between the concrete structure and the steel sheeting surface. Irregularities and height variations in the concrete may contribute to building leakage problems in the future.

A Roof System is generally not economical when compared to a complete pre-engineered building, especially for intermediate and large spans. This is due to the fact that the rigid frame action of a pre-engineered steel building distributes stresses optimally throughout the frames resulting in a lighter and more economical overall structure. In a Roof System, stresses are concentrated at the mid-span of the roof rafter that requiring heavier rafters.