A roof system that fails in performing is very expensive in global terms. Initially there is a
wastage of time and resources allocated to drying out water leakage or condensation, often
requiring the making good of decorative finishes.
Over a longer period of time, the life span of these roofs is reduced so that materials need to
be partially or totally replaced. An ineffective thermal insulation increases the energy demand
of a building. For application companies the real cost of remedial works is very high, both in terms of management time and soured client relationship.