Description
Thermoguard Fire Varnish Overcoat Exterior
Thermoguard Fire Varnish Overcoat Exterior is the durable protective finishing stage of the Thermoguard Fire Varnish System for external timber and timber-derived surfaces.
Designed for exterior environments and exposed timber features, this specialist fire retardant varnish helps provide UV resistance, weather protection and long-term durability while preserving the natural beauty of wood.
When used together with Thermoguard Fire Varnish Basecoat, the complete system provides decorative fire protection for timber without covering the grain beneath opaque paint systems.
What It Does
- Provides a durable exterior fire retardant varnish finish.
- Protects timber against UV exposure, weathering and wear.
- Works as part of the Thermoguard Fire Varnish System.
- Enhances natural timber grain and character.
- Helps suppress flame spread and smoke development during fire conditions.
Why Choose Thermoguard Fire Varnish Overcoat Exterior?
- Built for exterior timber: designed to withstand weather exposure and environmental wear.
- Maintains natural timber appearance: protects wood without hiding grain beneath heavy paint coatings.
- UV and weather resistance: helps reduce premature ageing and surface degradation.
- Decorative flexibility: available in clear and woodstain finishes with matt or satin sheen options.
- Professional fire protection system: works alongside Thermoguard Fire Varnish Basecoat for tested fire performance.
Where It Can Be Used
- External timber doors
- Exterior timber cladding
- Joinery and architectural woodwork
- Timber boarding and panelling
- Pool and humid environments
- Previously varnished timber surfaces
- Decorative exterior timber features
Ideal For
- Hotels and hospitality venues
- Commercial timber projects
- Luxury residential developments
- External architectural wood features
- Timber refurbishment projects
- Public buildings
- Visible timber where decorative appearance matters
Fire Performance
- Achieves EN Class B fire performance within the complete system.
- Meets BS476 Part 7 Class 1 surface spread of flame requirements.
- Achieves BS476 Part 6 fire propagation standards.
- Designated Class 0 in accordance with UK Building Regulations.
- Can contribute toward 30 or 60 minute fire resistance systems where specified correctly.
How The System Works
- Thermoguard Fire Varnish Basecoat provides the primary intumescent fire protection layer.
- The Exterior Overcoat seals and protects the system from UV, weather and wear.
- Under fire conditions, the system expands to create an insulating barrier.
- This barrier helps shield timber from heat, oxygen and flame penetration.
- The complete system helps reduce smoke and fire spread hazards on timber surfaces.
Finish & Colour Options
- Available in matt and satin finishes.
- Clear finish preserves the natural appearance of wood.
- Woodstain options available for decorative timber enhancement.
- Suitable for both modern and traditional timber projects.
- Designed to complement architectural timber finishes rather than conceal them.
Application Information
- Apply only over correctly installed Thermoguard Fire Varnish Basecoat.
- Suitable for brush, roller and spray application.
- One coat is normally sufficient internally.
- Two coats may be recommended for external or potentially damp environments.
- Always follow Thermoguard specification guidance and spread rates.
Surface Preparation
- Surfaces must be clean, dry and free from contamination.
- Previously varnished timber should be abraded to provide a suitable key.
- Loose coatings or unstable finishes must be removed before application.
- Ensure all timber is fully dry before coating.
- Always test adhesion on unusual substrates before large-scale application.
Durability Benefits
- Designed to provide a tougher and more durable finish than standard decorative varnishes.
- Helps protect timber from UV degradation and environmental wear.
- Suitable for regularly cleaned or exposed timber surfaces.
- Flexible finish helps accommodate natural timber movement.
Good To Know
- This product forms only one part of the complete Thermoguard Fire Varnish System.
- Thermoguard Fire Varnish Basecoat must always be applied beneath the overcoat.
- Coverage rates are critical to achieving tested fire performance.
- Exterior timber may require periodic maintenance depending on exposure conditions.
- Certificates of Supply may be available for qualifying projects following correct specification and application.
Need Exterior Fire Protection Without Hiding The Timber?
Many exterior fire protection systems cover timber beneath thick opaque coatings that completely hide the wood beneath. Thermoguard Fire Varnish Overcoat Exterior is designed for projects where preserving the natural appearance of timber is just as important as achieving professional fire protection.
Need Help Choosing The Correct Exterior Timber Fire Protection System?
External timber environments can vary significantly depending on weather exposure, moisture and UV levels. If you are unsure which Thermoguard varnish system is suitable for your project, contact the technical team before ordering.
Technical Support: 01142 768008
Email: technical@thermoguard.co.uk
