I want this on the roof of my house some day
That said, I CAN appreciate a roofing product that claims to last up to 100 years without needing significant maintenance. Such is the case with the steel roofing that Follansbee markets. The secret to their roof’s longevity is a ZT alloy plating over steel. It’s a combination of zinc and tin, and according to the company it can resist the corrosive effects of salt spray for an indefinite amount of time. Why indefinite? The ASTM test to measure the length of time the material can resist salt spray before rusting was abandoned after 5,000+ hours, because the material showed no sign of rust.