Basics

The use of Metal Sheeting for roofing, rather than Shingle Roof , Green Roof , or Tile Roof
More Simple/Cheap to install than Tile Roofs, but still more durable than Shingle Roofs
May be more durable than both, need to look into this
Only real issue (Short of corrosion, if not using some form of coating / Anodization / Galvanization , or even just a Sacrificial Anode ) is noise when rain hits the roof, although there are noise reducing layers/strategies for this
They can become dented by hail, although this isn't a structural issue, just an aesthetic one
Also they are less prone to Ice dams / snow buildup due to shedding snow better (citation needed on this)

Internal Links

Lay metal roofing over the wooden frame and fasten the roofing onto the wooden beams using fasteners that tighten for a water-tight, weather-resistant seal. Be sure to leave plenty of overhang (~3ft) because CEB walls are susceptible to precipitation.