Similar to wall system, There are many available roof system for your kit homes.
Choose the most suitable one but not the most expensive one, depends on your budget, local culture, climate conditions, building regulation requirements and your personal preferences.
I would personally recommend metal corrugated sheets for pacific island countries, and Asphalt shingles for US market.
Below are typical roof systems

Corrugated metal sheet -trimdek roof- fiberglass insulation, roof battens, steel trusses

Asphalt shingles- SBS waterproof membrane – OSB – Steel trusses
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