The roof build-up is governed by the functional and performance requirements of the building. The two most important factors are the thermal and acoustic requirements.
Listed below are some of the common build-up systems for sheet metal roofing system with its corresponding approximate thermal transmittance (U-value) and approximate Sound Transmission Coefficient (STC value):
Suitable for: auditorium, convention hall, musical theater, airports
Suitable for: Multipurpose hall, shopping complex, hospital, home-theater roof, studio
Suitable for: offices, school, university, institutional building
Suitable for: residential houses, bungalows, food-court