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Intumescent Paint for Wood
Intumescent coatings for timber are a passive fire protection measure designed to expand under heat, forming a char that insulates the surface and slows ignition. These coatings are essential for structural and solid timber where a specific fire resistance rating - usually 30 or 60 minutes - is required. When applied to compliant substrates such as doors or load-bearing wood components, they help delay structural collapse, offering valuable evacuation time during a fire.
Thermoguard Timbercoat
An intumescent basecoat used as part 1 of a system to achieve 30 or 60 minute fire resistance for compartmentation. Can achieve 30 or 60 minutes Fire Resistance in certain instances subject to a specification from the Technical Department. For BS Class 1/0 and EN Class B only see Thermoguard Timbercoat Insulating Basecoat. Interior and...
Bollom Broflame Ultra Basecoat
We apologise for the current supply issue affecting some Bollom products. Whilst we await a resolution from the manufacturer, please see below some suggestions for alternatives. If you’re looking for a system for; Walls & Ceilings see: Thermoguard Wallcoat BS Class 1/0 & EN Class B System Timber see: Thermoguard Timbercoat BS...
Thermoguard Fire Varnish 30 & 60 Minute System
A clear intumescent varnish (with 9 woodstain shades available) for interior and exterior timber surfaces. Each pack contains the correct amount of basecoat (Fire Varnish Basecoat) and topcoat (Thermoguard Fire Varnish Overcoat (Interior) or Thermoguard Fire Varnish Overcoat (Exterior)) to ensure protection is achieved inline with the...
Thermoguard Fire Varnish Door Upgrade System
An intumescent varnish system to upgrade solid doors to 20 or 30min Fire Resistance: Available as a convenient pack containing the required basecoat, topcoat and mastic to protect 3 doors in a clear or woodstain coloured Matt or Satin finish Thermoguard UK will issue a Fire Certificate for Authority approved projects following completion...
Bollom Intulac Ultra Basecoat
We apologise for the current supply issue affecting some Bollom products. Whilst we await a resolution from the manufacturer, please see below some suggestions for alternatives. If you’re looking for a system for; Timber see: Thermoguard Fire Varnish BS Class 1/0 & EN Class B System Doors see: Thermoguard Fire Varnish Door Upgrade...
Thermoguard Fire Varnish Basecoat
A clear intumescent varnish that is the first coat of a 2 coat system (3 coats externally) for the decorative Fire Protection of timber and timber derived substrates to BS Class 1, Class 0 and EN Class B s2 d0. See Thermoguard Fire Varnish Overcoat (Interior) or Thermoguard Fire Varnish Overcoat (Exterior) to complete the system. Complete...
Tikkurila Fontefire WF Clear
A water-borne intumescent coating with highest possible fire retardant properties on interior and exterior wood. When subjected to heat, Fontefire WF Clear expands and forms an insulating layer of foam. Fontefire WF Clear has fire reaction class B-s1, d0, according to the standard EN 13501-1:2007+A1:2009, the highest possible for wood...
Thermoguard Timbercoat Door Upgrade System
An intumescent paint system to upgrade solid doors to 30min Fire Resistance, with 4,000+ colour options. Available as a convenient pack containing the required basecoat and topcoat to protect 2 doors in a white or coloured Eggshell or Gloss finish Thermoguard UK will issue a Fire Certificate for Authority approved projects following...
Thermoguard Timbercoat 30 Minute System
A 4,000+ colour intumescent paint system for interior and exterior timber surfaces. These packs have been created to help users ensure they are purchasing sufficient product for their project. Each pack contains the correct amount of basecoat (Timbercoat) and topcoat (Thermoguard Smoke & Flame Retardant (SFR) Dualcoat) to ensure...
Thermoguard Timbercoat 60 Minute System
An intumescent paint system in 4,000+ colours for interior and exterior timber surfaces. Each pack contains the correct amount of basecoat (Timbercoat) and topcoat (Thermoguard Smoke & Flame Retardant (SFR) Dualcoat) to ensure protection is achieved inline with the manufacturers recommendations to the respective area in question....
Tikkurila Fontefire WF
Water-borne intumescent coating with highest possible fire retardant properties on interior wood, fibreboard, chipboard and plywood surfaces in industrial painting processes. When subjected to heat, Fontefire WF expands and forms an insulating layer of foam. Has fire reaction class B-s1, d0, according to the standard EN 13501-...
Hensel Hensotherm 2 KS White Interior
A single component, white intumescent coating for the fire protection of interior wooden structures. For use on solid wood, particle boards and plywood for construction with a thickness of under 8mm and a density of under 338 kg/m³. Fire behaviour is classified B-s1, d0 according to DIN EN 13501 (SBI-test) Classifies solid wood and wooden...
Hensel Hensotherm 2 KS Black Anthracite Interior
A single component, black anthracite intumescent coating for the fire protection of interior wooden structures. For use on solid wood, particle boards and plywood for construction with a thickness of under 12mm. It has been specially developed for the fire protection of wooden structures used in the theatre/stage/set design and saves the...
Hensel Hensotherm 2 KS Exterior
A single component, intumescent coating for the fire protection of exterior wooden structures. For use on wooden coreboards and solid wood with a thickness of under 12mm and a bulk density at least 630 kg/m³. Fire behaviour is classified C-s2, d0 according to DIN EN 13501-1 (SBI-test) if applied on all sides of the wooden material...
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Intumescent Paint for Wood – Fire Rated Coatings in Clear & Colour Finishes
Timber used in construction must meet modern fire safety requirements to protect life and property. Intumescent paint provides a critical form of passive fire protection by forming a protective barrier during a fire. When heated, the coating swells into a dense char that slows heat transfer and prevents the wood from igniting quickly.
These coatings are suitable for structural timbers, including beams, columns and timber panelling, helping buildings meet regulations for loadbearing capacity, insulation and integrity. Available in coloured or clear finishes, they enable compliance without compromising visual appearance in heritage or decorative settings.
Different project requirements may also call for fire retardant paints, which delay flame spread and reduce smoke generation. These are typically chosen where fire resistance is not needed but surface reaction must be limited. Technical advice is essential to ensure the correct system is used for your substrate, location and fire rating specification.
Intumescent Paint for Wood FAQs
Can I apply intumescent paint directly over old coatings?
No. Most intumescent paints must be applied to bare timber or surfaces primed with compatible primers. Old coatings, including varnishes and paints, can affect adhesion and fire performance. Surface preparation, such as sanding or chemical stripping, may be required. A trial patch or adhesion test is advisable before full application. Always check the product's data sheet and consult the manufacturer or a fire protection specialist for guidance on preparing previously coated surfaces.
Are intumescent paints suitable for decorative wood finishes?
Yes, but it depends on the product. Clear intumescent systems are specifically designed to preserve the visual appearance of wood while offering fire resistance. These are often used in heritage buildings or high-end commercial interiors. However, they require strict application to achieve tested film builds. Any topcoats used for aesthetic purposes must also be compatible and approved within the tested system. Decorative finishes must never compromise fire protection performance or interfere with intumescence.
What happens if the required dry film thickness is not achieved?
Failure to reach the correct dry film thickness (DFT) will compromise the fire rating and can invalidate certification. Each system has a tested DFT range that must be achieved precisely. A wet film gauge should be used during application, and DFT measurements confirmed after curing. Skipping this step may mean the coating does not expand as intended, leaving the timber vulnerable. Professional applicators or close consultation with the technical team is strongly advised for critical fire-rated projects.
Is professional application always necessary for intumescent paint?
Not in all cases, but it is strongly advised for structural applications where certified fire protection is essential. Some products are marked for "consumer use", but those restricted to "professional use only" must be applied by trained professionals. DIY use may be suitable for minor, non-structural or decorative work, but correct film thickness, compatibility, and drying times are still crucial. Any application on structural timber or load-bearing elements should follow manufacturer-approved procedures. Improper use poses serious safety risks and can result in non-compliance with building regulations.