AllShield Blue - FM 4484 & FM 4482 Approved fire protection for existing flat roofs
AllShield Blue or BarrierSheet for fire-safe and insurable PV roofs
We have two FM Approved solutions for making roofs with photovoltaic systems fire-safe and insurable: AllShield Blue and the AllShield BarrierSheet. The best choice depends on your roof situation.
If you are working with an existing roof and want a retrofit solution without removing the current roof build-up, then AllShield Blue is typically the right choice. AllShield Blue is a mineral roof coating and the world’s first to be FM Approved under both FM 4484 and FM 4482, for flat roofs with or without solar panels. It is designed to upgrade combustible roof systems into fire-safe, insurable PV roofs with minimal added weight.
If the roof membrane is ageing, roof load is critical, extra insulation is required, or a liquid-applied coating is just not the preferred solution, the AllShield BarrierSheet is often the better option. The BarrierSheet is a lightweight, non-combustible mineral cover board installed beneath the roof membrane and is FM 4478 Approved for roofs with photovoltaic systems.
How AllShield Blue Stops Fire
From the Top Down
AllShield Blue is applied as a seamless, ceramic top-layer coating over the existing waterproofing membrane. Its non-combustible composition blocks heat and flame from penetrating to the insulation and roof structure. Even in case of fire in a solar panel, the underlying materials do not ignite, preventing spread to adjacent panels. Fire stays localized and extinguishes quickly, often without intervention — making even uninsurable roofs safe for PV systems.
Fast Application, Long-Term Protection
Application is straightforward and weather-dependent. A certified team can cover up to 450 m² per day using standard spraying equipment. No open roof is needed — the coating is applied directly on top of existing waterproofing. After curing, it forms a 3 mm seamless, fireproof layer with a 50+ year lifespan and built-in UV resistance.
Application on New and Existing Roofs
AllShield Blue can be used on both new constructions and existing flat roofs that are still watertight. For older roofs, a primer ensures strong adhesion. The coating can be removed and reused, making it a sustainable choice. It is suitable for roofs with slopes up to 15°.
Certifications and Compliance
AllShield Blue
AllShield Blue has been extensively tested and certified to meet the highest international standards. It holds the following certifications:
FM 4484 Approved
→ Tested and listed on FM RoofNav.
→ Protects flat roofs with PV against external fire spread.
FM 4482 Approved – Class 1
→ Tested and listed on FM RoofNav.
→ Suitable for non-combustible roof maintenance applications.
Kiwa dynamic wind load
→ Tested for wind uplift resistance at Kiwa-BDA.
→ Proven to stay securely attached under storm wind loads.
A1 Certification AllShield Blue coating
→ A1 Non combustable certification.
→ Caloric bomb test.
Product information AllShield Blue
AllShield Blue is built for durability, safety and seamless integration into flat roof systems. Developed through years of research and field experience, it supports both new builds and renovations. Its formulation reflects our commitment to performance, sustainability and ease of application. Trusted by professionals across Europe, AllShield Blue delivers confidence from day one. Key product details are listed in the table below.
| Property | Value |
| Composition | Two-component ceramic mineral blend |
| Thickness | 3.0 mm ± 10% |
| Weight | 4.8 kg/m² (wet), calculated weight 6.0 kg/m² |
| Colour | White |
| VOC | 0 g/L |
| Application | Airless spray, certified applicator |
| Coverage | ~1 m² per liter (at 1 mm layer) |
| Shelf life | 6 months (unopened, dry storage at 5–40 °C) |
| Compatible with | Bitumen, TPO, PVC (no EPDM) |
| Reinforcement | Glass fleece EKL™ 800/450 |
| Surface finish | Seamless, waterproof, UV-proof |
Technical information AllShield Blue
Engineered for resilience, AllShield Blue is designed to perform under extreme conditions. Its properties have been tested internally and by independent institutes across various parameters. These outcomes reflect our focus on long-term roof protection and industry-leading safety. Whether exposed to heat, weather or mechanical stress, AllShield Blue stands firm. An overview of key performance data is provided in the table below.
|
Property |
Value Standard |
Test Method |
|
Fire classification |
A1 / Non-combustible |
EN 13501-1 |
|
Heat resistance |
> 1000 °C |
Internal |
|
Thermal expansion |
< 0.1 mm/m |
Internal |
|
Water absorption (24 h) |
< 10% |
Internal |
|
UV resistance |
Excellent |
Internal |
|
Wind uplift resistance |
Tested (KIWA 22-L-0237/1) |
KIWA |
|
Recyclability |
100% |
Internal |
Projects AllShield Blue
Protecting what matters. Fire safety is the goal. Insurability the result. Our projects with AllShield Blue show how that promise becomes reality across sectors, applications and environments.
Downloads AllShield Blue
Frequently asked questions (FAQ) AllShield Blue
Is AllShield Blue FM Approved?
Yes. AllShield Blue is FM 4484 Approved, the Approval Standard for Retrofit Coatings for Roof-Mounted Rigid Photovoltaic Module Systems – the highest international FM Approval for roof fire safety.
It also holds FM 4482 Class 1 Approved for repair and maintenance coatings.
What makes it fireproof?
A1-certified mineral composition. No plastics. No PFAS. It doesn’t ignite, melt or drip.
Is it suitable under solar panels?
Yes. It stops ignition and spread under PV panels and has been tested at Kiwa-BDA for NEN 7250:2021 conditions, ZAG and FM 4484 in summer 2025.
How is it applied?
Sprayed or rolled at 2–3 mm thickness over bitumen, PVC or EPDM membranes.
Will it void my current roof warranty?
Some roofing manufacturers may withdraw warranty. Always check with them before applying AllShield Blue.
Does it help waterproof the roof?
No. The roof has to be watertight. It adds fire protection and it’snot a leak fix.
How does it perform against acids?
It is resistant to industrial acids like sulfuric and nitric acid — suitable for chemical zones.
How long does it last?
Tested for >50 years of service life. Comes with a 10-year product warranty.
What insulation is it compatible with?
Works well on roofs with EPS, PIR, PUR insulationthe AllShield Blue covers the watertight roofing membrane and protect the underlayeing layers and building.
Where has it been tested?
Efectis (A1, 13501-1 fire), FM Global (FM 4482, summer 2025 FM 4484,), Kiwa-BDA NEN 7250: 2021 (under review) (Dutch fire tests), — including in PV fire simulations.
