Metal roofs tend to reflect radiant heat that is emitted from the sun, which helps to reduce heat accumulation. As a result, you can save on the energy required for air condition during the day. With that being said, the material might be low in R-value, and many systems comprise of a dead air space in between the roof to improve efficiency. Most roof materials are simple to install on without any leakages or damage. Best of all, metal roofs are virtually impervious to snow and rain due to the unique structure of the roofs.