Our Grade 1 metal comes with a 40-year warranty on all paint colors. We use Galvalume, a 55% Al-Zn coated sheet steel product that is ideally suited for most types of roofing and siding applications. Galvalume sheet steel continues to gain approval by specifiers, architects, and builders due to its versatility, ease of use, aesthetics, and long-term performance. Our metal is 28 gauge thickness.