Thermoguard Fire Varnish Overcoat (Exterior)
Thermoguard Fire Varnish Overcoat (Exterior) is a solvent based, clear UV and wear resistant varnish that is the final coat of a 2 coat system for the decorative Fire Protection of timber and timber derived substrates to Class 1, Class 0, EN Class B s2 d0. Contact the Technical Department (0113 2455450) for 30 or 60 minutes Fire Resistance.
Intended Use – Clear Fire Protection Overcoat for Fire Varnish System for Exterior Wood
Thermoguard Fire Varnish is a clear varnish system for the Fire Protection of timber and timber derived substrates to BS Class 1 and Class 0 Surface Spread of Flame as well as BS EN Class B s2 d0 (For 30 or 60 minutes Fire Resistance contact our Technical Department on 0113 2455450 prior to purchase). The system is made up of a basecoat and an overcoat that must be used together, the special formula provides a tough, durable finish to external wood (for interior surfaces see Thermoguard Fire Varnish Overcoat (Interior)). The clear finish enhances the natural beauty of the wood while providing protection against UV and wear as well as fire protecting new and previously varnished surfaces.
The Thermoguard Fire Varnish System is made up of Thermoguard Fire Varnish Basecoat which is a clear, intumescent varnish to be finished with Thermoguard Fire Varnish Overcoat (Interior) or Thermoguard Fire Varnish Overcoat (Exterior) available in a clear matt or satin finish (a gloss finish is available in both interior and exterior versions in batch quantities for large projects). The Thermoguard Fire Varnish Overcoats provide protection against UV, weathering (exterior grade) and wear whilst Thermoguard Fire Varnish Basecoat provides the Fire Protection.
Intumescent Fire Protection
When exposed to fire, the Thermoguard Fire Varnish System expands to create an insulating barrier, protecting timber surfaces from flames, heat and oxygen and suppressing emission of deadly smoke & gasses.
Specification and Application
Prepare and apply – (INTERIOR)
- 1 coat of Thermoguard Fire Varnish Basecoat
- 1 coat of Thermoguard Fire Varnish Overcoat (Interior) Matt or Satin
Prepare and apply – (EXTERIOR, DAMP, HIGH WEAR AREAS or FRUITWOODS)
- 1 coat of Thermoguard Fire Varnish Basecoat
- 2 coats of Thermoguard Fire Varnish Overcoat (Exterior) Matt or Satin
Available Pack Sizes
- Thermoguard Fire Varnish Basecoat is available in 20m² packs
- Thermoguard Fire Varnish Overcoat (Interior) is available in 20m² and 80m² packs
- Thermoguard Fire Varnish Overcoat (Exterior) is available in 20m² and 40m² packs
Applicators should also refer to instructions on product containers.
Previously Varnished and Stained Surfaces or Wood Preservers
The Thermoguard Fire Varnish System can be applied over firmly adhered standard clear varnish. For existing stained varnishes, stain coatings, old fire coatings or if in doubt, contact our Technical Department on 0113 2455450.
- If preservatives are required, use rapid drying clear non waterrepellent grades**.
- For tanalised or other preservative treatments, contact our Technical Department.
**Allow adequate time for stain or preservative fluids to escape before applying the Thermoguard Fire Varnish System.
Fire Test Standards and Certification
- BS EN Class B s2 d0
- Class 1 and Class 0
Note - For 30 or 60 mins Fire Resistance see Thermoguard Fire Varnish 30 & 60 Minute System.
For fire protection to doors, see Fire Door Upgrade Kits
We will issue a Certificate of Supply upon request for each correctly specified project for Insurance, Fire and Building Control Authority and Client Records against proof of purchase.
NEW Fire Regulations and Tests Explained
- The new fire standard BS EN test lasts 20 mins. with airflow replaces the old BS 476 tests which lasted 10 mins and restricted airflow.
- The new standard for flamespread and heat release Class B replaces Class O.
The new BS EN tests also monitor -
- Smoke & Gas “s” – s1 + s2 are none or very low & compliant levels, s3 moderate , s4 high smoke.
- Flaming Droplets or Airborne particulates – dO is none, d1 some, d2 + d3 moderate > high levels.
It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.
|Typical Coverage (per coat)||Supplied in pre-measured packs to apply 1 coat to 20m² or 40m²|
|Touch Dry||8 Hours|
|Application||Brush, Roller, Spray|
|The figures stated above are approximate. Please ensure you refer to all datasheets for full application information.|
|Brian Hepworth on 06/03/2018|
Good morning. Can your clear varnish 2 coat system work on plywood that has been painted with acrylic paint (various colours) and still be classed as fire retardant?
No, clear fire retardant systems can't be applied over previously painted surfaces. Certain clear fire retardant systems can be applied over existing stains and varnishes but not opaque paints. To upgrade previously painted surfaces you should use something like Thermoguard Timbercoat BS Class 1/0 & EN Class B System or Thermoguard Timbercoat 30 & 60 Minute System in the colour and finish of your choice.
Colour reproduction of the Products on the Site is limited by the technology used to deliver web pages and by the colour representation of Customer’s own monitor and computer set-up. We have made every effort to display as accurately as possible the colours of our Products but we cannot guarantee that the colour shown on Customer’s monitor’s display will accurately reflect the colour of the Product on delivery. We recommend that Customer first purchases the smallest Product available or access an industry standard colour chart in person (and not digitally) to ensure that the colour is acceptable for its purposes. For more information, please see our Terms & Conditions of Sale.Close