Silicone Roof Coating Myths
Silicone roof coatings have become one of the most popular ways to restore a commercial flat roof in Southern California, and with that popularity comes a lot of bad information. Some of it comes from contractors who don't install silicone, some from bad installs, and some is just old-school roofing folklore. We covered the biggest ones in a short video on our Roofing in a Minute channel, and the response told us building owners want straight answers. Here's the full breakdown.
Prefer to watch? Watch "Silicone Roof Coating Myths" on YouTube, or browse more of our commercial roofing videos.
Why Silicone Roof Coatings Get Misunderstood
A silicone roof coating is a fluid-applied, seamless membrane sprayed or rolled over an existing commercial roof — modified bitumen, single-ply, built-up, or metal. Instead of tearing off and landfilling the old roof, a restoration crew repairs it, cleans it, and coats it, turning it into a monolithic, highly reflective surface.
Because the end result looks like a fresh coat of white paint from the street, a lot of people assume that's all it is. That assumption drives most of the myths below. At Central Roofing we've applied over 30 million square feet of roof coatings and restorations across Los Angeles and Orange County since 1992, so we've heard every one of them.
"Silicone roof coating is just expensive paint."
The truth: a properly installed silicone system is a full roof restoration, not a cosmetic topcoat.
Paint is a thin decorative film. A commercial silicone restoration is applied at a manufacturer-specified thickness (measured in mils), over a roof that's been power washed, repaired, and reinforced at seams, penetrations, and flashings. Products like Tropical #924 Eterna-Sil are high-solids, moisture-cured silicones engineered to resist UV, weathering, and standing water for years.
The difference shows up in the warranty. Paint doesn't come with a 15- or 20-year manufacturer roof warranty. Silicone restorations do — when they're installed correctly.
"Once you go silicone, you can never recoat it."
The truth: silicone recoats very well — with silicone.
This myth has a grain of truth that got stretched. Very few materials other than silicone will bond well to an existing silicone surface, so you can't come back years later with an acrylic or asphalt product. But silicone bonds to clean silicone. When the coating nears the end of its service life, the roof is cleaned and a fresh silicone layer is applied, often renewing the warranty without ever tearing off.
That's one of the biggest long-term advantages of silicone: the roof can be renewed again and again instead of replaced. Before any recoat, we verify adhesion with a field test — here's why silicone roof coating pull tests matter.
"Silicone roofs are impossible to repair."
The truth: repairs are straightforward when you use the right material and prep.
A puncture from a dropped tool or an HVAC service visit doesn't mean the roof is ruined. The damaged area is cleaned, any wet material underneath is addressed, and silicone is applied over the spot — often with reinforcing fabric. Problems happen when someone patches a silicone roof with the wrong product (like asphalt mastic), which won't stick.
We break this down in detail in Are Silicone Roofs Hard to Repair? The short version: make sure your roof maintenance provider knows how to work on coated roofs.
"Ponding water will destroy a roof coating."
The truth: ponding water is exactly where silicone outperforms other coatings.
Low-slope roofs almost always have spots where water sits for a day or two after rain. Water-based acrylic coatings can soften and break down under constant standing water. Silicone is inherently moisture-resistant and is designed to handle ponding without degrading, which is a major reason it's the go-to choice for flat roofs in LA and Orange County.
That said, a coating isn't a fix for a structural drainage problem. Severe ponding from a sagging deck or blocked drains should be corrected as part of the restoration.
"You can coat over any roof, no matter its condition."
The truth: coatings only work on roofs that are still good candidates.
This is the myth that creates bad silicone jobs and gives the whole industry a black eye. If the insulation below the membrane is saturated, or the roof has multiple failed layers, coating over it traps moisture and the problem continues underneath. A legitimate contractor will inspect first — including core cuts and moisture checks where needed — and tell you honestly if the roof needs a full replacement instead.
The good news: plenty of roofs that owners assume are "done" still qualify. Catching a roof early, before water gets into the insulation, is the key to keeping restoration on the table. See how we evaluated one in our Santa Ana commercial flat roof restoration case study.
"Roof coatings don't come with a real warranty."
The truth: manufacturer-backed silicone systems carry long-term warranties.
When a certified contractor installs a silicone system to manufacturer specs — including thickness, prep, and inspection — owners can receive manufacturer warranties commonly in the 10- to 20-year range, depending on the system and mil thickness. For example, our See's Candies restoration in Carson covered roughly 359,500 square feet with Tropical #924 silicone and carries a 20-year warranty.
Always ask who backs the warranty (contractor, manufacturer, or both), and whether it's prorated. Learn more about our commercial roofing warranties.
"Silicone and acrylic coatings are basically the same thing."
The truth: they're different chemistries built for different situations.
Both are reflective cool roof coatings, but they behave differently on the roof:
| Factor | Silicone | Acrylic |
|---|---|---|
| Ponding water | Highly resistant | Not recommended where water sits |
| UV / weathering | Excellent, erodes very slowly | Good, gradually chalks and thins |
| Dirt pickup | Can attract dirt; cleaning restores reflectivity | Stays cleaner |
| Recoating | Recoat with silicone | Recoats with many products |
| Best fit | Flat roofs, ponding areas, long-term restoration | Well-drained, sloped roofs; budget projects |
Neither is "better" in every case. Compare options on our acrylic roof coatings page, or read the best materials for commercial roofing durability in LA & Orange County.
Bonus: Silicone Coatings and Energy Savings in California
White silicone coatings reflect a large share of solar heat, which keeps the roof surface and the space below cooler. That can reduce cooling loads on warehouses, industrial buildings, and apartments. Reflective roofs are rated by the Cool Roof Rating Council (CRRC), and California's Title 24 Building Energy Efficiency Standards include cool roof requirements for many reroofing projects. The U.S. Department of Energy also has a helpful overview of how cool roofs work.
Wondering whether the numbers work for your building? Read Are Cool Roof Coatings Worth It? Cost, ROI & Savings Guide.
How to Tell If Your Roof Is a Good Silicone Candidate
- The existing membrane is mostly intact, with leaks you can locate rather than widespread failure.
- Insulation below the roof is mostly dry (confirmed by inspection, not guesswork).
- The building has a low-slope or flat roof with some ponding areas.
- You want to avoid tear-off cost, noise, and disruption to tenants or operations.
- You plan to own the building long enough to benefit from a renewable roof.
If that sounds like your property, a restoration may cost significantly less than a replacement. Our Los Angeles commercial roofing and Orange County commercial roofing teams can walk your roof and tell you which path makes sense.
Get a Straight Answer About Your Roof
Free commercial roof assessment from a family-owned contractor serving Southern California since 1992. CA Lic. #684960.
Request Free Assessment Call 310-527-6770Silicone Roof Coating FAQ
How long does a silicone roof coating last?
A professionally installed silicone system typically lasts 10 to 20 years depending on thickness, product, and roof conditions. Because silicone can be recoated with silicone, the roof can be renewed at the end of that term instead of replaced.
Can you put silicone coating over an existing roof?
Yes. Silicone is commonly applied over modified bitumen, built-up, single-ply (TPO/PVC), and metal roofs, as long as the existing roof and insulation are in good enough condition. An inspection determines whether the roof qualifies.
Is silicone roof coating good for flat roofs with ponding water?
Yes. Silicone's moisture resistance makes it one of the best coating choices for flat roofs where water sits after rain. Structural drainage problems should still be corrected during the restoration.
Can a silicone roof be repaired?
Yes. Damaged areas are cleaned and patched with compatible silicone, often with reinforcing fabric. The key is using silicone-compatible materials, since most other products won't bond to it.
Is silicone roof coating slippery?
Silicone can be slippery when wet. Walkway pads or textured paths are often added around HVAC units and high-traffic areas for safer roof access.
Does a silicone roof coating help with Title 24?
White silicone coatings rated by the Cool Roof Rating Council can help reroofing projects meet California Title 24 cool roof requirements. Requirements vary by building type and climate zone, so confirm with your contractor.
Have a question we didn't cover? Visit our commercial roofing FAQ or contact our team directly.