What Roof Rejoov actually is
Roof Rejoov is a soy and plant-derived maltene restoration product applied by spray to asphalt shingles. Maltenes are the oily, flexible components of asphalt. When asphalt shingles are new, they contain roughly 50% maltenes, which keep the shingle soft, flexible, waterproof, and able to self-seal. Over time, UV light, heat, and oxidation evaporate maltenes out of the asphalt, leaving behind the harder asphaltene fraction. That is why old shingles are brittle, dry, and crack when you bend them.
Rejoov replaces those lost maltenes with plant-derived equivalents that penetrate into the asphalt rather than coating the surface. The result is a shingle that recovers some of its original flexibility and waterproofing. It is not paint, not a coating, and not a sealant. It is a chemical restoration of the asphalt itself.
The science, without the marketing
Asphalt is not one compound. It is a mixture of heavy molecules (asphaltenes) and lighter oily molecules (maltenes, which include resins, aromatics, and saturates). Fresh asphalt shingles are flexible because the maltenes plasticize the asphaltenes. As maltenes evaporate, the ratio shifts toward asphaltene-dominant, and the shingle behaves more like a brittle solid than a flexible waterproof membrane.
UV exposure drives this aging. In Texas, the effect is accelerated because UV index in Katy regularly hits 10-11 in summer, well above the national average. That is why a 20-year asphalt roof in Katy often performs like a 15-year roof in a northern state.
Maltene restoration products, whether petroleum-based or bio-based, are designed to replace the lost oils. Bio-based versions use soybean, corn, or other plant-derived oils that chemically substitute for petroleum maltenes without introducing VOCs or harsh solvents. The product sprays on as a liquid, penetrates the shingle, and carries restored flexibility back into the asphalt matrix.
This is not new science. Asphalt rejuvenation has been used on road pavement for decades (similar chemistry, different application). Applying it to residential shingles is newer but backed by independent testing from organizations like ORNL and accelerated weathering studies.
Who Roof Rejoov is right for
Be honest with yourself about roof condition before getting excited. Rejoov works well in a specific window.
Ideal candidates
- Asphalt shingle roof, 12-18 years old
- Shingles are drying out, losing flexibility, starting to curl or cup
- Granule loss is moderate (not bald spots, not fresh)
- No active leaks
- No missing, cracked, or severely damaged shingles
- No storm damage claim pending
- Owner plans to stay in the home 5+ years or wants to delay replacement
Not a candidate
- Roofs with hail damage, wind damage, or missing shingles (replace, don't restore)
- Roofs with active leaks (fix the leak first, then evaluate)
- Roofs over 20 years old with structural wear (past the point of restoration)
- Tile roofs (Rejoov is for asphalt, tile has different failure modes)
- Metal roofs (no asphalt to restore)
- Flat or low-slope commercial roofs (different chemistry, different products)
- Brand new roofs (no value, they are not aged yet)
- Roofs with major ventilation problems (fix the cause first)
Realistic expectations
Here is the honest part. Rejoov is not magic. It does not make an old roof new, and it does not double the lifespan. Realistic results based on independent testing and real-world Texas applications:
| Metric | Realistic outcome |
|---|---|
| Shingle flexibility recovery | Partial, measurable improvement |
| Granule adhesion | Improved, reduces further loss |
| Waterproofing | Restored on intact shingles |
| Life extension | 5-10 years typical, depending on starting condition |
| Cost vs full replacement | Roughly 15-25% of replacement cost |
| Warranty period | Typically 5 years product warranty |
| Time to apply | 4-6 hours for average Katy home |
A 5-10 year extension is not 20 years. If your roof is heading toward replacement in 3 years without Rejoov, you are looking at maybe 8-13 years total with it. Eventually every asphalt roof gets replaced.
How Roof Rejoov is applied
- Inspection and candidacy check. A qualified applicator walks the roof and evaluates whether Rejoov is the right call. If it is not, they should tell you and recommend repair or replacement instead.
- Cleaning. Loose debris, moss, and heavy dirt are removed. Not pressure washing, which strips granules.
- Spray application. The product is sprayed on in an even coat using low-pressure equipment. It penetrates in minutes.
- Curing. The product cures within a few hours and becomes rain-safe. Full cure is 24-48 hours.
- Cleanup and final walkthrough. Applicator cleans landscaping, checks drift, and confirms coverage.
Most single-family Katy homes are done in half a day. No tear-off, no dumpster, no disruption.
Cost versus replacement
| Option | Typical cost (Katy, 2,500 sq ft home) | Expected additional life |
|---|---|---|
| Do nothing | $0 | Whatever is left, typically 2-5 years for aged roofs |
| Roof Rejoov | $2,500 - $4,500 | 5-10 years |
| Full replacement (asphalt) | $12,000 - $25,000 | 20-30 years |
The math works well when you plan to stay in the home 5-10 more years and your roof is in the Rejoov candidacy window. It does not make sense if your roof is already failing (replace it) or if it is new (no point).
Environmental angle
One genuine benefit worth mentioning. Roof replacement sends an average 2-3 tons of shingle waste per home to landfill. Asphalt shingles are not widely recycled in Texas. Extending a roof 5-10 years delays that waste stream. For homeowners who care about keeping materials out of landfills, this is a real factor.
Rejoov is also bio-based, meaning it does not introduce petroleum solvents or heavy VOCs during application. It is not a factor for most homeowners but matters for some.
What to ask any Rejoov applicator
- Is my roof actually a candidate, and will you tell me honestly if it is not?
- What is the product warranty and what does it cover?
- Who is the manufacturer and how long have they been making this product?
- Have you done this on other Katy area homes? Can I see a case example?
- What is the expected life extension on my specific roof based on its current condition?
- What is the application rate per square and are you using full coverage?
- What happens if my roof needs replacement within the warranty period?
If an applicator cannot answer these, that is a problem. Jerry's Roofing does Roof Rejoov across the Katy area and we tell people "no" all the time when their roof is not a candidate, because a $3,000 application on a roof that should be replaced is a waste of the homeowner's money.
FAQ
Is Roof Rejoov the same as a roof coating?
No. A roof coating (silicone, acrylic, or elastomeric) sits on top of the roof as a membrane. Rejoov penetrates into the asphalt itself. Coatings are not appropriate for residential asphalt shingles. Rejoov is.
Does Roof Rejoov affect my shingle warranty?
Most asphalt shingle warranties are effectively expired by the time Rejoov makes sense (12+ years in). Check your specific manufacturer warranty before applying. For newer roofs, Rejoov is rarely the right call anyway.
Can I apply it myself?
The product is only sold to trained applicators. Application requires specific equipment and technique to avoid over-saturation, drift onto landscaping, and uneven coverage. DIY is not an option.
How soon can I get another application?
A second application is typically possible 5-7 years after the first, if the roof is still in candidacy condition. Some homeowners chain two applications for 10-15 years of total extension before replacing. Others use one and then replace.
Is this covered by insurance?
No. Insurance covers sudden damage, not routine maintenance or life extension. Rejoov is out-of-pocket unless it is part of an insurance settlement where the adjuster specifically approves it, which is rare.
Curious if your roof is a candidate? Jerry's Roofing does free Roof Rejoov candidacy inspections across Katy, Cypress, Cinco Ranch, Richmond, Fulshear, Sugar Land, and Brookshire. If your roof is right for it, we will say so. If it needs repair or replacement instead, we will tell you that too. Call (409) 351-1529 or request an inspection online.