We don’t put a number of years on it, because no field study has shown how long a treatment holds up on a Phoenix roof. SoyLei, the maker of the product we use, says to reapply every five years. Before any second treatment, we look at the roof again instead of booking one by the calendar.
What SoyLei says
SoyLei Innovations of Ames, Iowa makes APEX-1132. Its product brochure says to apply it “within 3 years of new roof installation” and to “reapply every five years.” That is the maker’s guidance, not a promise from us.
SoyLei gives no separate interval for hot climates, and it has published no field data from the desert. So we treat the five-year figure as SoyLei’s starting point and let the roof itself tell us the rest.
Why we won’t quote years
How a roof ages depends on things no product controls. How worn the shingles were on treatment day matters. So do which way the slopes face, how hot the attic runs, and what each monsoon throws at it. InterNACHI, an inspectors’ association, notes that “South-facing roof slopes have shorter lifespans due to increased thermal cycling and UV exposure.” Two roofs on the same street can age at very different speeds.
Shingle makers aren’t on board either. Some, Owens Corning among them, have published bulletins advising against field-applied rejuvenators, and a treatment can affect your shingle warranty. Any honest answer about how long it lasts starts with “it depends.”
How we handle a second treatment
When your roof is due for another look, we check it first. If the shingles have cracked, lifted or lost a lot of granules since last time, another treatment won’t help, and we’ll say so. If the roof is still a fit, we talk about it then. Our roof care plan covers those return visits. Read about the product on our soy-based roof treatment page, or book a free roof evaluation to start.