Please note that this product CANNOT be used without first receiving an application schedule from our Technical Department. Please download and complete the 'Thermoguard Wood Enquiry Form' and return by email to [email protected]

If you have any questions regarding this process consult our technical department on 0113 2455450 (option 2).

Quick Links - Click To Jump To Section:

   
• Clear Fire Protection Basecoat Fire Varnish System for Wood
• Intumescent Fire Protection
• Specification and Application
• Previously Varnished and Stained Surfaces or Wood Preservers
• Fire Test Standards and Certification
• Preparation
• Important Application Notes
• Conditions

Clear Fire Protection Basecoat Fire Varnish System for Wood

Thermoguard Fire Varnish is a varnish system with the option of a clear or stained finish 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 see Thermoguard Fire Varnish 30 & 60 Minute System). The special formula provides a tough, durable finish to internal and external wood. Clear or stained overcoats enhance the natural beauty of the wood while fire protecting new/bare surfaces. Thermoguard Fire Varnish Overcoat (Interior) and Thermoguard Fire Varnish Overcoat (Exterior) provide protection against UV and wear.

The Thermoguard Fire Varnish System is made up of Thermoguard Fire Varnish Basecoat (a two component, water based product consisting of a base and activator mixed together before use - see image above) 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 or stained matt or satin finish. Thermoguard Fire Varnish Overcoats provide protection against UV and wear whilst Thermoguard Fire Varnish Basecoat provides the Fire Protection.

Restricted to professional users. Not for sale to, or use by, the general public.

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

2023 compliant 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 see Thermoguard Fire Varnish 30 & 60 Minute System)

Prepare and apply – (INTERIOR)

• 1 coat of Thermoguard Fire Varnish Basecoat
• 1>4 days after Basecoat is dry, apply 1 coat of Thermoguard Fire Varnish Overcoat (Interior) Matt or Satin Clear or 2 coats of Thermoguard Fire Varnish Overcoat (Interior) Matt or Satin Woodstain Colour.

Prepare and apply – (EXTERIOR, DAMP, HIGH WEAR AREAS or FRUITWOODS)

• 1 coat of Thermoguard Fire Varnish Basecoat
• 1>4 days after Basecoat is dry, apply 2 coats of Thermoguard Fire Varnish Overcoat (Exterior) Matt or Satin Clear or Woodstain Colour.

Please note: Timber must be clean and thoroughly dry prior to application (maximum 18% moisture content). Any gaps should be sealed with Thermoguard Intumescent Mastic. Fire should be prevented from accessing unprotected wood surfaces and for external applications it is recommended wood has been sealed on the reverse face to stop water ingress.

NOT suitable for the topside of floor surfaces that will be trafficked/walked on.

Available Pack Sizes

• Thermoguard Fire Varnish Basecoat is available in 20m² packs
• Thermoguard Fire Varnish Overcoat (Exterior)is available in 20m² packs
• Thermoguard Fire Varnish Overcoat (Interior)is available in 20m² packs

Application by painters, decorators & other professional users only. Refer to instructions on Fire Varnish Base & Overcoat 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 water repellent 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 Door Upgrade Products.

Thermoguard 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. After successful application of a complete system a certificate can be applied for HERE

Preparation

• Cover, countersink & fill, or use non-ferrous, galvanized, stainless or sheradised fittings
• Ensure surfaces are dry, clean and free of all contamination – i.e. oils or waxes including white spirit.
• Varnished, sealed or non-porous wood should be abraded thoroughly with medium grade silicone carbide abrasive when dry to provide a good key.

Application to OSB/Sterling Board

This is a board made of chips of wood glued together to form a hard non-decorative board. If it needs fire coating, Thermoguard Fire Varnish or Thermoguard Timbercoat BS Class 1/0 & EN Class B System can be applied to it to provide surface spread of flame protection ONLY (BS Class 1/0 and EN Class B). However we first recommend a test is carried out by applying a small amount of the proposed coating to the board to check for "cessing" / "cissing" (where coating gathers together in lumps and may leaving bare patches between). If this occurs the board should be degreased/cleaned and allowed to dry before testing again - if this still does not provide a satisfactory application please contact our Technical Team for further advice on 0113 2455450 (option 2) or send a message to [email protected].

Important Application Notes

The Thermoguard Fire Varnish System should only be applied to dry wood, with dry conditions during application and drying of basecoat and overcoat. Thermoguard Fire Varnish Basecoat is a water-based 2 pack coating.

After Mixing Allow to Stand for 30-60mins before use.

Apply to a small test area before applying generally.

Use within 4 hours of mixing.

Apply 1 or 2 coats, ensuring the correct amount applied relative to the coated area.

Important Note: Ensure good air movement & ventilation with dry conditions before and during the application, until over-coated. 

Drying

Minimum drying time 8 hrs.

Ensure the basecoat is hard dry at the time you apply the overcoat.

Drying time of the basecoat in good conditions is overnight.

Once the basecoat has hard dried, it remains ideal to overcoat for a further 4 days. Thereafter, the basecoat becomes gradually harder, until it reaches a point where the overcoat may not obtain a good bond.

Thermoguard therefore recommend overcoating when basecoat is dry, within the following 4 days in good conditions.

Note: The longer the delay beyond '4 days after basecoat has dried' (so typically 5 days after application), the greater the risk of overcoat delaminating.  If overcoating is delayed notably beyond 7 days after the basecoat was dry, it is advised;  Basecoat is abraded to obtain a key with 120 grit abrasive  Apply a light coat of basecoat to replace material removed during abrasion then apply overcoat within the ideal window or as near to it as possible.

Conditions

During application & drying of the full system:-

• Ensure surfaces are thoroughly dry – max 18% moisture content.
• Maximum relative humidity RH 75%.
• Ensure adequate ventilation.
• Minimum air temperature 6°C. Minimum surface temperature 3°C above dewpoint – avoid condensation.

Cleaning

Return as much unused material to its original container as possible. Wash brushes, rollers and guns with Clean Water immediately following use.

Health & Safety

Please refer to the relevant Safety Data Sheet for full details of this product. Apply all products in accordance with BS 6150:2019- Code of practice for painting of  buildings. Do not store this product in cold temperatures below 5°C or above 30°C.

Further Support

If you require any further assistance, please contact our Technical Team on 0113 2455450 (option 2) or email [email protected]

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and Conditions and should be applied only by an individual with the necessary expertise and experience. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.