In today's metal roofing market, on new construction or replacement roofing, the trend is moving towards the use of Standing Seam [Vertical Seam] or Batten Seam Metal Roofing. This is generally referred to as architectural roofing. Only recently [since 1990's] has architectural roofing entered into the mainstream of residential roofing market . The advantages of the architectural roofing are:  Time proven in public schools and other buildings with a lifetime longevity of 30 - 50 years, saving you time and money. Protects in high fire danger zone - highest fire rating. Will not break or crack in heat or when walked on. Many design aspects available to enhance project. Available in many colors [even custom colors] 30 to 40 year manufacturers paint finish warranty meaning no pealing or painting. The actual finish will last 40 to 50 years.