Thermoguard Fire Varnish 30 & 60 Minute System
Thermoguard Fire Varnish 30 & 60 Minute System is a clear intumescent varnish 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 (Fire Varnish Basecoat) and topcoat ( Fire Varnish Overcoat) to ensure protection is achieved inline with the manufacturers recommendations to the respective area in question.
Each component of the packs can still be purchased individually if required here: Thermoguard Fire Varnish Basecoat and here: Thermoguard Fire Varnish Overcoat (Interior) or Thermoguard Fire Varnish Overcoat (Exterior)
For fire protection to doors, see Fire Door Upgrade Kits
For BS Class 1/0 & EN Class B s2 d0 only see Thermoguard Fire Varnish BS Class 1/0 & EN Class B System
- 6.5m² Pack (Interior Spec.) = 1 x 20m² Fire Varnish Basecoat + 1 x 20m² Fire Varnish Overcoat (Interior)
- 6.5m² Pack (Exterior Spec.) = 1 x 20m² Fire Varnish Basecoat + 1 x 20m² Fire Varnish Overcoat (Exterior)
- 13m² Pack (Interior Spec.) = 2 x 20m² Fire Varnish Basecoat + 1 x 20m² Fire Varnish Overcoat (Interior)
- 13m² Pack (Exterior Spec.) = 2 x 20m² Fire Varnish Basecoat + 1 x 20m² Fire Varnish Overcoat (Exterior)
- 20m² Pack (Interior Spec.) = 3 x 20m² Fire Varnish Basecoat + 1 x 20m² Fire Varnish Overcoat (Interior)
- 20m² Pack (Exterior Spec.) = 3 x 20m² Fire Varnish Basecoat + 1 x 20m² Fire Varnish Overcoat (Exterior)
- Apply 3 coats of Thermoguard Fire Varnish Basecoat @ 20m² per 20m² pack/per coat
Followed by either;
- Internal Applications: 1 coat of Thermoguard Fire Varnish Overcoat (Interior) Matt or Satin @ 20m² per 20m² pack
- External, Damp or High Wear Applications: 2 coats Thermoguard Fire Varnish Overcoat (Exterior) Matt or Satin - Each 20m² pack is sufficient to apply 2 coats to 20m² of surface.
To achieve 30 & 60mins + EN Class B s2 d0 and BS Class 1/0 minimum thicknesses apply of which approval must be sought before purchase.
A gloss finish is available in batch quantities for large projects.
IMPORTANT - The below information from the manufacturer must be read and referred to your relevant authority for approval BEFORE purchase and use.
We have an indicative 30min Fire Test at a UKAS Fire Test Laboratory demonstrated 10mm loss to charring on plywood & MDF.
Our Fire Varnish BS EN Class B Test indicates that softwood did not burn significantly for the 20mins test duration and our previous Class O Part 6 Fire Propagation test indicates that protected softwood did not burn within the 10 minutes test duration.
Further in-house testing indicated that when applied at three times the Class B & Class O specification Fire Varnish intumescent added a total of 20 minutes Fire Resistance.
We assess projects requiring 30 or 60mins Fire Resistance on an individual basis, referring to the TRADA Char Rate Tables and calculated residual timber to ascertain whether we could issue a Fire Certificate for the project. A written specification should be obtained from the Technical Department for your project prior to use to ensure this system will be suitable.
In order to enable us to issue a 30 minutes Fire Certificate in the case of softwood the surface must be able to afford the loss of 8mm depth from all surfaces exposed to a fire. For 60 minutes we assess based on 25mm loss during the fire.
For oak or similar woods the loss to take into account is 5mm for 30mins and 17mm for 60mins.
In other words, the residual timber should be adequate to in the case of:
- Underside of a floor to support the anticipated weight load on the floor.
- A timber ceiling under-drawing a floor and joists can be treated as sacrificial but should have protected the area above to 30mins
- A timber wall should still be able to support itself without the fire passing through to the area the other side.
Timber must be clean and thoroughly dry prior to application (maximum 18% moisture content).
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 Timbercoat System can be applied to it. 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 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. 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.
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.