Why I Don't Recommend Roof Spray to My Customers (Yet)

I'm Samed Guvenc. I run Talya Roofing here in Savannah.

Roof rejuvenation raises a practical question: is it a sensible use of a homeowner's money? Here is my view, based on the evidence discussed in Talya Roofing's longer guide.

First, what I give the spray credit for

I want to be fair. As asphalt shingles age, their asphalt binder can become stiffer. Some rejuvenators use oil-derived ingredients intended to soften that binder. Results depend on the formulation. Laboratory improvements do not by themselves establish additional service years for a particular roof.

Some of the lab results are real. I'm not going to tell you otherwise.

But a lab result is not years on a real roof. The laboratory evidence discussed here does not establish how many additional years a particular treatment will provide on a Savannah roof. Ask the seller for product-specific field evidence, its limitations, and the written treatment warranty. A 2025 peer-reviewed lab study on this was co-written by people with disclosed interests: six of its ten authors disclosed owning shares in SoyLei Innovations. The shingle makers' trade group (ARMA) put out a bulletin in July 2026. It advises against coatings and rejuvenators on installed asphalt shingles.

The evidence discussed here does not establish how long a particular treatment will last on a Savannah roof. That uncertainty is why I am not ready to recommend routine rejuvenation spraying to my customers.

What worries me most

1. People think it will help with their insurance

A treatment does not change the date the shingles were installed. Whether an insurer recognizes it when assessing condition, eligibility, premiums or coverage is a separate question. Ask your insurer for a written answer specific to your roof and policy.

In Georgia, the mitigation-discount law recognizes qualifying FORTIFIED construction and other Commissioner-approved mitigation standards, subject to certification and documentation. A surface-applied shingle rejuvenation treatment alone does not establish eligibility.

I'm a roofer, not an insurance agent. So please call your agent and ask in writing before you spend money on this hoping for a break.

2. Coatings and our humidity

Some products are intended to penetrate the shingle; others form a surface film. The formulation and resulting layer matter when evaluating performance and moisture behavior.

Here is my worry. Some coatings don't breathe. The shingle makers warn they can seal the gaps between shingles and may hold moisture in. Now think about Savannah. Hot. Humid. Heavy summer rain. Moisture has to go somewhere.

Roof moisture behavior depends on the whole assembly, including indoor humidity, air leakage, insulation, underlayment and drying paths. Manufacturers warn that some coatings may restrict drying or contribute to moisture accumulation. The effect of a particular treatment requires product- and assembly-specific assessment. Ventilation alone does not establish suitability. But the warning is there, and I take it seriously.

3. Waiting on a real repair

An active leak, missing or damaged shingles, failed flashing, or soft decking calls for an inspection and repair plan before any surface treatment is considered. Do not rely on rejuvenation as a substitute for needed repairs. Delaying those repairs can allow water damage to spread.

If something is broken, fix it. If the roof is at the end of its life, in my opinion replacement is usually the better money.

My honest bias

I do repairs and replacements. That's my business. So you should ask me for proof too, just like you ask the spray company. Ask anyone who wants your money to show you the evidence and put it in writing.

If you want a second opinion

If you're in Savannah or nearby and you're not sure what your roof needs, call us at Talya Roofing, (912) 999-7989. The roof-replacement estimate is free. I'll tell you what I see, straight.

— Samed Guvenc, owner, Talya Roofing LLC, Savannah, GA