BESTSTEEL AC-780, corrugated profile metal panel, steel, (0.5mm OR 0.6mm TCT), installed with supplier specified fasteners (no fasteners penetrating cladding skin) and all accessories incidental to the system, including insulation, vapor barrier and purlins; Inner metal sheeting to be BESTSTEEL Q-915 OR Q-900H (0.4mm OR 0.5mm TCT).