Advantages of metal roofing include durability, a long life expectancy, improved energy efficiency and improved fire safety. Disadvantages include cost and difficulty matching color during repairs. Metal roofing is also noisy during rain and hail storms and is prone to expansion and contraction.
Metal roofing is lightweight, making it easy to install and reducing the amount of engineering and support needed by the underlying structures. It is insect-resistant and does not rot, mildew or burn during a fire. Many roofs are impact-resistant and rated to sustain wind gusts of up to 140 miles per hour. Properly installed, a metal roof typically lasts for the lifetime of the house and most manufacturers warranty their roofing for 20 to 50 years. Metal roofs reflect the sun's heat and can reduce cooling costs by 10 to 25 percent.
As of 2015, metal roofing costs between $150 and $600 per 100 square feet. This is roughly the same as premium roofing materials, but is two to three times more expensive than other options. Rain or hail striking the roof can be noisy, and hail may dent non-impact-resistant roofs. Metal roofs contract and expand with changing temperatures, this can cause the roof to wave and the fasteners used to support the roof may loosen.