Few systems in the average commercial building are more critical and more expensive than the roof. Exposed to the elements for decades on end, a roof is under attack throughout its entire life cycle. What can building owners do to protect their investments? Although there is no such thing as an unlimited roofing guarantee, a roof warranty can protect a building owner against certain types of damage, as well as flawed workmanship or materials. There are different kinds of warranties, however, and it is important to know what these warranties do and do not cover before signing on the dotted line.