Direct Answer
No. Silicone roof coatings are not automatically suitable for every roof type in Florida. Silicone can be an effective restoration coating for many commercial roofing systems, but compatibility depends on the existing roof membrane, surface condition, primer requirements, coating system, manufacturer instructions, and applicable Florida or Miami-Dade approval.
Current Florida product-approval documentation demonstrates that some silicone coatings are approved for specific substrates such as Modified Bitumen, EPDM, TPO, BUR, PVC, metal, spray polyurethane foam, and concrete. However, the approved substrate list varies by product. For example, a 2026 GAF silicone-coating evaluation lists different substrate and primer requirements depending on the coating and roof type. GAF — Florida Building Code Silicone Roof Coating Evaluation
Who This Applies To
This information is useful for:
- Commercial property owners
- Property and facility managers
- Building owners considering roof restoration
- Owners of TPO, PVC, EPDM, Mod Bit, BUR, metal, or SPF roofs
- Developers and general contractors
- Property owners in Florida’s HVHZ and non-HVHZ areas
Not for: Applying silicone directly to an existing roof simply because the product is marketed as a universal roof coating. The exact coating approval and manufacturer’s substrate requirements must be checked first.
1. What Roof Types Can Silicone Coatings Be Used On?
Depending on the specific product, silicone roof coatings can be used over several commercial roofing substrates.
One current Florida Building Code evaluation for GAF silicone coatings identifies approved substrates including:
- Modified Bitumen, APP and SBS
- EPDM
- TPO
- BUR
- PVC
- Galvanized metal
- Spray-applied polyurethane foam
- Structural concrete
However, the same evaluation specifies different primers and conditions for different substrates. For example, some Modified Bitumen surfaces require an asphalt bleed-block or multipurpose primer, while TPO can require a TPO-specific primer depending on the coating. GAF — Allowable Silicone-Coating Substrates
2. Is Silicone Suitable for Modified Bitumen?
Yes, in many cases. Silicone coatings can be approved for both APP and SBS Modified Bitumen systems.
However, the coating may require a specific primer depending on whether the existing membrane has a smooth or granulated surface and whether it is new or aged.
Before coating a Mod Bit roof, inspect for:
- Open seams
- Blisters
- Exposed reinforcement
- Surface deterioration
- Moisture intrusion
- Failed flashing
- Oil or chemical contamination
A coating should restore a fundamentally sound roof; it should not be used to conceal widespread membrane failure.
3. Is Silicone Suitable for BUR?
Yes, some silicone coatings are approved over Built-Up Roofing (BUR).
For example, the current GAF Florida evaluation lists granulated BUR as an allowable substrate for its High Solids Silicone Roof Coating and identifies primer requirements for that application. GAF — Silicone Coating Requirements for BUR
BUR requires particular attention to the existing surfacing. Gravel or aggregate can affect preparation, adhesion, and coating consumption. Loose or poorly embedded aggregate may need to be addressed before coating.
4. Can Silicone Be Applied Over TPO or PVC?
Yes, but substrate preparation and primer requirements are critical.
Some silicone systems are specifically evaluated for use over TPO and PVC. However, the required primer can vary by product and substrate condition.
For example, the current GAF evaluation identifies:
- TPO as an allowable substrate with a specified TPO primer for one coating system.
- Existing PVC as an allowable substrate with a multipurpose primer for another coating system.
Therefore, “silicone sticks to TPO” is not enough information to determine whether a particular coating system is appropriate. The exact manufacturer’s approved assembly and preparation procedure should be followed. GAF — TPO and PVC Silicone-Coating Requirements
5. Can Silicone Be Used Over EPDM?
Some silicone coating systems are approved over EPDM.
The current GAF evaluation identifies new or existing EPDM as an allowable substrate for specified silicone products. GAF — EPDM Silicone-Coating Evaluation
As with other single-ply membranes, the roof should be thoroughly cleaned and evaluated before coating. Existing repairs, contaminants, aged surfaces, and incompatible previous coatings can affect adhesion.
6. Can Silicone Be Used on Metal Roofs?
Yes, certain silicone coating systems can be used on metal roofs.
For example, the current GAF Florida evaluation identifies galvanized metal as an allowable substrate for its High Solids Silicone Roof Coating. GAF — Silicone Coating for Metal Roofing
But coating a metal roof requires more than covering the panels. A contractor should evaluate:
- Rust and corrosion
- Panel seams
- Fasteners
- Penetrations
- Flashing
- Existing coatings
- Movement at seams and joints
Defective seams or fasteners should generally be addressed before the coating system is installed.
7. What About Asphalt Shingles and Tile Roofs?
Do not assume that a commercial silicone roof coating approved for low-slope systems is suitable for shingles or tile.
A current Florida Notice of Acceptance for one silicone coating product specifically excludes asphaltic shingles, fiber-cement shingles, quarry slate, cement or clay tile, and wood shingles or shakes from its permitted substrates. Florida Building Commission — Silicone Coating Notice of Acceptance
This is an important example of why the product’s actual approval documentation must be checked instead of assuming that every silicone coating can be applied to every roof material.
8. Does Florida Product Approval Matter?
Yes, particularly when the project is subject to Florida Building Code or HVHZ requirements.
Florida’s Product Approval system identifies approved roofing products and their limitations of use. Some silicone coatings have approvals for both HVHZ and non-HVHZ applications, while the individual approval documents can contain additional limitations and installation requirements. Florida Building Commission — Product Approval Search
For example, one current Florida approval for a silicone roof coating lists the product as approved for use both inside and outside the HVHZ but directs users to the associated installation instructions and Notice of Acceptance for conditions and limitations. Florida Building Commission — Silicone Roof Coating Product Approval
9. Does Silicone Work in Florida’s Hot and Wet Climate?
Silicone can be well suited to Florida conditions when the correct system is selected and installed properly.
Silicone coatings are commonly used as restoration membranes, and approved systems are available for Florida commercial roofing. Some products are also approved for HVHZ applications, subject to their specific limitations and installation requirements. Florida Building Commission — Current Silicone Coating Approval Example
However, Florida’s climate also makes proper drainage, substrate preparation, flashing condition, ponding-water considerations, and installation weather important. A silicone coating should not be selected solely because it is advertised as waterproof.
10. When Should You Not Use Silicone?
A silicone coating may not be appropriate when:
- The existing roof has widespread structural deterioration.
- Significant moisture is trapped within the roof assembly.
- The membrane has extensive unrepaired damage.
- The substrate is contaminated and cannot be properly prepared.
- The existing roof is incompatible with the selected coating.
- The required primer is unavailable or cannot be properly applied.
- The proposed application does not comply with the product approval.
- The manufacturer does not approve the existing substrate.
A roof restoration coating is most useful when the underlying roof still has sufficient integrity to serve as a suitable substrate.
11. What Should Be Checked Before Applying Silicone?
- Identify the existing roof system.
- Inspect the roof condition for leaks, moisture, deterioration, and failed details.
- Check the silicone manufacturer’s approved substrates.
- Confirm primer requirements.
- Review the Florida Product Approval or applicable evaluation.
- Check HVHZ requirements if the property is in Miami-Dade or Broward County.
- Prepare the substrate according to the manufacturer’s instructions.
- Repair defective seams, flashings, penetrations, and other deficiencies.
- Verify coating thickness and application requirements.
- Document the completed restoration system for future maintenance and warranty records.
Bottom Line
Silicone is suitable for many commercial roof types in Florida, but it is not a universal coating for every roof. Current approved systems can be used over substrates such as Modified Bitumen, BUR, TPO, PVC, EPDM, metal, SPF, and concrete, depending on the specific product and required preparation.
The safest approach is to match the silicone product + existing roof substrate + primer + roof condition + Florida approval + installation requirements. Never assume that a coating approved for one roof type is automatically approved for another.
Related Questions
- Can cool roof coatings be applied to any existing roof material?
- What is the best roof coating for a commercial building in Florida?
- How long do commercial roof coatings last in Florida?
- When is roof coating a good alternative to roof replacement?
Sources
- GAF — Silicone Roof Coatings: Florida Building Code Evaluation
- Florida Building Commission — Product Approval Search
- Florida Building Commission — Progressive Silicone Roof Coating NOA
- Florida Building Commission — Silicone Roof Coating Product Approval
Last reviewed: October 2026
Related Resources
Before specifying a silicone restoration system, document the existing roof type, roof condition, substrate preparation, primer requirements, product approval, coating thickness, and completed installation.
Need Commercial Roofing Help?
ShieldLine Roofing can evaluate an existing commercial roof and determine whether silicone coating, another restoration system, repair, or full replacement is the appropriate solution.
Disclaimer: Silicone coating suitability is product- and substrate-specific. Always follow the current manufacturer’s instructions and applicable Florida Building Code, Product Approval, or Notice of Acceptance requirements.
Commercial Roof Coatings & Restoration
