What we will not claim
This site publishes no "adds X dollars" figure and no percentage return, because those numbers depend on an appraisal that has not happened. Any operator quoting one is guessing on your behalf.
What can be said is what happens to the roof and what paperwork exists afterwards.
What actually changes for a buyer
Three things. The roof has been scored, so its condition is a number rather than an opinion. It has been treated, so its surface is shedding water again. And the treatment carries a registered warranty that transfers once to the next owner.
A buyer walking round with an inspector is asking how much life is left in the roof. Those three documents answer it.
Why the transferable part matters
A warranty that died with the previous owner would be of no use in a sale. This one moves with the house, once, to the next owner, and the remaining term goes with it.
That is a small but real thing to have ready before the listing goes live.
What it does not do
It does not make an old roof new, so it does not turn a house with a worn roof into a house with a new one. A buyer comparing two similar houses will still see the difference between a treated roof and a replacement.
It also does not change the house price by itself. It gives the roof a documented condition, which is a different thing.
What it does do for the house
It keeps a roof in service that would otherwise be replaced years earlier, which is a cost avoided rather than a value added. That distinction matters when you are deciding whether to spend the money at all.
It also produces a record. A scored roof, a treated surface and a registered warranty are three facts a buyer can check, and none of them depend on anyone taking your word for it.
How to talk about it in a listing
If you do mention the roof, describe what was done rather than what it is worth: the treatment, the date, the band the roof scored and the term registered. Anything beyond that is a claim you would have to defend.