Question

What happens when the warranty is up? Can the roof be treated again?

Usually yes, and this is worth understanding before you start, because almost nobody explains it.

Rejuvenation is maintenance, not a one-time fix. Think of it like the way you service other things in a house rather than the way you replace them. A roof that is treated and holds up well can generally be treated again later, which is where the "up to 15 years" figure you see across this industry comes from: it is cumulative across more than one application, not a single treatment.

The warranty itself is written per product: 6 to 15 years depending on the treatment your roof gets. The longer expectation builds across more than one application.

What matters is that the roof still qualifies at that point. If your shingles have failed by then, more treatment is not the answer, and we will say so at that inspection the same way we would at this one.