Last updated: August 2026
Roof rejuvenation treatments soak into asphalt shingles to restore flexibility. Most of the products on the market, including the well-known national brands, are soy-based. Ours is different: a first-of-its-kind, patent-pending corn-oil formula that is USDA-certified 95% bio-based, third-party lab tested, and designed to penetrate the shingle and restore both flexibility and granule adhesion.
What is roof rejuvenation?
Asphalt shingles are held together by oils in the asphalt that keep them flexible. Over years of sun and weather, those oils cook out, the shingle stiffens, and granules start to let go. Rejuvenation replaces some of what time takes away: a plant-derived treatment is sprayed on and penetrates the shingle rather than coating it, restoring flexibility so the shingle can keep expanding and contracting through Pennsylvania's freeze-thaw cycles without cracking.
Our corn-based formula is USDA-certified 95% bio-based, which means its active ingredients come almost entirely from renewable, plant-derived content rather than petroleum. That certification, through the USDA's BioPreferred program, is a real, verifiable claim, not marketing language. The soy-based products on the market are chemically different and do not carry that certification.
What's the difference between corn-based and soy-based?
The main difference is the base feedstock and the specific formula built on it. Corn-derived and soy-derived treatments start from different plant oils and are formulated differently to carry restorative oils into a dried-out shingle.
Most competing rejuvenation products, including the large national brands many homeowners have heard of, are soy-based. Our treatment is corn-based instead. That's the verifiable distinction: ours is corn-based and USDA-certified 95% bio-based; most others are soy-based and are not USDA-certified bio-based products.
What does the corn-based formula actually do?
Here's what we can say about our corn-based rejuvenant, backed by testing rather than marketing:
- 95% USDA-certified bio-based. The formula is built overwhelmingly from renewable, plant-derived content rather than petroleum. The kind of biobased content certified through the USDA’s BioPreferred program.
- Works at the molecular level. It penetrates into the shingle and reaches the asphalt binder rather than sitting on the surface as a film or paint.
- Restores flexibility. By replenishing oils, it helps a stiff, aging shingle bend again instead of cracking under thermal stress.
- Restores granule adhesion. It helps the protective mineral granules hold their grip, which slows the granule loss that exposes the mat.
- Third-party lab tested. The performance claims are grounded in independent testing, not just our own word for it. You can read how that testing worked on our does it work? page.
Does the corn-vs-soy choice change the result for my roof?
For most homeowners, the practical takeaway is this: rejuvenation is meant for a specific kind of roof. Asphalt shingles that are aging but still sound, generally around 6 to 20 years old, not leaking or storm-damaged. Our corn-based, USDA-certified 95% bio-based formula is what we've chosen to use because of how it penetrates and the independent testing behind it. It restores flexibility and granule adhesion on a roof that's a candidate for treatment; it does not fix leaks, flashing, or missing and cracked shingles.
If you've been comparing us against a soy-based national brand, the difference is not just the crop. Our formula is USDA-certified 95% bio-based; the soy-based products on the market are not. We're confident in our corn-based formula and the lab results behind it. See how we stack up on our Roof Maxx alternative page. But we'd rather you pick based on the roof in front of you than on brand names.
How do I know if my roof is a candidate at all?
The formula only matters if your roof is actually right for rejuvenation in the first place. A treatment makes sense on an aging-but-intact roof, where restoring flexibility can add years of service life at a fraction of replacement cost. On a roof that's already leaking or failing, no rejuvenant is the answer, corn or soy, and we'll say so.
The only way to know which category you're in is to have the shingles looked at. Free Inspection and we'll tell you whether treatment is worth it for your specific roof.