Thermoguard Timbercoat Door Upgrade System

Condition: New product


Thermoguard Timbercoat Door Upgrade System is an intumescent paint system to upgrade doors to 30min Fire Resistance and 30min Fire Doors to 60min. 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 completion.

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Product Description

Upgrading Doors to 30 Minutes Fire Resistance and 30 minute Fire Doors to 60 minute with Thermoguard Timbercoat Intumescent Paint

Most modern normal internal doors cannot be upgraded to achieve 30 minutes Fire Resistance. Issues include them often being hollow core, can be very thin, lightweight and are liable to warping shortly after installation. No door answering such a description can be upgraded and should be replaced with a new Fire Door where one is required. Thermoguard recommend that both sides of the door are protected and are unable to supply certification unless sufficient product is purchased and applied to both sides of the door.

While Thermoguard recommend the installation of custom built fire doors there can be reasons not to do so. Doors that Thermoguard Timbercoat is capable of upgrading are ones that can afford to lose 2mm to charring.

  1. Solid, joint free doors with compressed core and a reasonable thickness (6mm+), veneer faces bonded to either side of the core. These can be flush doors or pressed to create a moulded look.
  2. Seasoned, old or sturdy doors with 35mm+ thick frames and solid panels 10mm+ thick.
  3. Certain other doors that are not prone to premature collapse.

Note: Well seasoned or old, sturdy doors with panels 8mm thick can be upgraded if additional “sacrificial” ply panels 6mm thick are fitted in the panel recesses and held in place by the door’s beading.

If your doors are in a category which could be upgraded submit your assessment to your Authority, along with Thermoguards explanatory Technical Note (available to download HERE) for approval prior to purchase. Thermoguard UK will issue a Fire Certificate for Authority approved projects following completion.

Please note: A written specification should be obtained from our Technical Department for your project prior to use to ensure this system will be suitable. Contact us by phone on 0113 2455450 or email [email protected] Remember, intumescent paint is just one element of protection and DOES NOT create a ‘fire door’. Intumescent materials and hardware MUST be used to ensure your doors meet the required standards of your authority. 


As doors vary so greatly and the great majority are unsuitable for upgrading it is neither meaningful or realistic to carry out an official NAMAS / UKAS Fire Door Fire Test. Thermoguard Timbercoat’s uniquely effective formula resulted in the UK’s only successful official UKAS / NAMAS Fire Test Laboratory Fire Resistance Test to 60 minutes on softwood with timber lost to charring restricted to 7-10mm at 60 minutes (unprotected softwood charring is approximately 50mm).

The system was also demonstrated by the Megastructures TV documentary “Building from Disaster” restricting charring to 2mm and retaining integrity and insulation throughout a 45 minute maximum severity burn (more severe than BS 476 part 22). This was while identical unprotected panels burnt in parallel were shown to burn through completely within 6 minutes.

In a recent UKAS / EGOLF Fire Test Laboratory 30 minute Fire Resistance test, Thermoguard Timbercoat applied 15% thinner than the 60 minute Fire Test or our specification below restricted loss to charring to 3mm on softwood and 2mm on MDF.

Thermoguard Technical Department assess doors as suitable based upon the customers description which features on the Fire Certificate issued, so this information should be checked before ordering.

We require that in a fire the door be capable of losing 2mm plus 2mm additional safety factor to charring without the risk of splitting or cracking of the thinnest areas (usually the panels) or other premature failure, while maintaining insulation.

Upgrading 30 minute Fire Doors to 60 minutes

Thermoguard issue a Fire Certificate for 60 minutes on 30 minute Fire Doors based upon the Test and recorded evidence referred to above.


Thermoguard recommend Astroflame intumescent strips are fitted around the door edges or in door casings.


  • Each 2 door pack has 1 x 5kg of Thermoguard Timbercoat and 1 x 2.5lt Thermoguard Flame Retardant Topcoat.
  • This should be applied to 2 doors on BOTH sides (4 door sides in total) and it is assumed that this area will total no more than 7m².
  • If your doors are unusual in size or total more than 7m² of area please contact the Technical Department.

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.

Technical Data

Typical Coverage (per coat)2 Doors (4 door sides)
ApplicationBrush, Roller
The figures stated above are approximate. Please ensure you refer to all datasheets for full application information.


Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.


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