What it is for
Between a roof that needs replacing and a roof that has been replaced there is usually a stretch of time: a sale to get through, a season to finish, a budget to arrange. A bridge buys that stretch.
It is not sold as a way to keep the roof for another decade, and it is not offered as a cheaper alternative to a full treatment on a roof that could take one.
The row, exactly
Boost in the Replace band (0-20) is 3 years, one coat, fully prorated, bridge, at $1.10 per square foot. Every other Boost row is issued at Low or Critical and carries 5 years.
The bridge row exists because a worn roof still benefits from shedding water rather than holding it, even when the surface has little left in it.
What it is honest about
Prorated from year one means the cover is at its highest immediately and reduces from there, which matches what a bridge is: a short window.
And nothing about it changes the underlying arithmetic. The roof is at the end of its service life, and the plan alongside a bridge is a replacement.
When a full treatment is better value
If the roof scores Low or Critical rather than Replace, the full treatments are available, and Boost with Fortify carries ten years of full cover for a roof that still has a surface worth protecting.
That decision belongs to the measured score at the assessment, not to the way the roof looks from the ground.
A bridge is a decision, not a default
The one thing we ask before quoting a bridge is what the roof is waiting for. A sale, a season, a budget being arranged: all of those are answers. "The roof is finished but I would rather not think about it yet" is not, and it is worth saying so.
That is not a sales argument for something larger. On a roof in this band there is nothing larger to sell, which is exactly why the conversation is honest.
What it looks like next to a replacement
A bridge is a fraction of the work of a replacement: one coat, one visit of about two hours, no tear-off and no dumpster. What it is not is a reason to postpone a replacement that the roof already needs.
The useful framing is that a bridge buys the time to plan, so the replacement happens on your schedule rather than after a leak.