The primary guarantee is provided by the material supplier.
Depending on application, Tata Steel Colorcoat® branded products (Colorcoat Prisma® and Colorcoat HPS200 Ultra®) are available with either the Confidex® Guarantee (for industrial and commercial projects) or Confidex® Home Guarantee.
SSAB offers a performance guarantee with their pre-finished steel products.
Depending on the location and application, good quality pre-finished steel products from Tata Steel or SSAB have a 50 year life span. Steel suppliers talk about period to repaint decision, which effectively means if the steel roof is repainted at specified intervals (usually every 25 years or more) it should last forever.
A workmanship guarantee is available from the installer and Vertix® Systems recommends customers asking for an insurance backed guarantee. Alternatively, you can get a latent defect insurance policy for the whole building. NHBC or Premier are providers of such insurance policies.