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Thermoguard Timbercoat Door Upgrade System


Thermoguard Timbercoat Door Upgrade System is an intumescent paint system to upgrade solid 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
  • 4,000+ colours available from RAL, BS & NCS
  • The clear wood varnish option is available, here

Please note: Colours are sold in the nearest tin size but actual paint volume per tin may vary up to 10% depending on colour.

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Thermoguard Timbercoat Door Upgrade System - 4000+ colours available from RAL, BS & NCS

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: Intumescent paint is just one element of protection and DOES NOT create a ‘fire door’. Doors should only be considered for upgrade when the historic integrity of the door must be maintained, evaluation of ironmongery and gaps around the door should be undertaken and then all works should be carried out by a specialist to meet the requirements 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.


  • Apply 4 coats of Thermoguard Timbercoat @ 7m² per litre / per coat.
  • Then apply 2 coats Thermoguard Flame Retardant Topcoat @ 8m² per litre / per coat
  • Touch Dry: 4 hours / Overcoat: 6 hours
  • Ensure fully hard dry before next coat, only apply to dry timber in good drying conditions.

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.
  • To aid topcoat opacity Thermoguard Timbercoat can be tinted to undercoat shades if required at no extra cost - please call if required.

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.

Product Details

Data sheet

Application Method
spray, brush
2 Doors (4 door sides)
Touch Dry
4 hours
Dry to Recoat
6 hours
Best Seller
Best Seller
Fastest Delivery
Next Working Day

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.

questions Jo-Anne Keyte on 2019-09-23 10:27:02

Hi, Would this paint be suitable for these doors? Moulded 4 Panel Grained Hollow Core Internal Door 2040mm x 726mm x 40mm 340116 X 3 from Travis Perkins? Thanks Jo

Answer from Rawlins’ Technical Team: 

Unfortunately none of our fire protection coatings for timber are suitable for hollow core doors.

questions Harry Loh on 2019-08-27 11:14:45

Please can I check if this is suitable for use over painted doors? I have standard (non-FD30 doors) that are already painted with normal undercoat and normal paint. Can I use this directly over the painted doors or do I need to remove the existing paint?

Answer from Rawlins’ Technical Team: 

Normal, conventional decorative paint is fine to be left on the doors as long as it is sound, well adhered and prepared thoroughly by cleaning and sanding to provide a key for adhesion.

questions Chris Thomas on 2019-01-13 16:24:40

Hi, do I need both undercoat and top coat to achieve FD30 status if I am going paint over them again with a different colour, or can I just use the undercoat? I appreciate you have different colour options but not all our doors required FD30 status and conventional paint will suffice.

Answer from Rawlins’ Technical Team: 

The Thermoguard Timbercoat Door Upgrade System is not a system you can paint over with your own paints, if this is something you wish to do you would instead need to consider the Envirograf Door Upgrade Paint System.

questions Craig on 2018-11-21 20:25:13

Hello, I have a solid wood door with glazed panels which have been covered over with 9mm fibre board (glue + nails) on both sides, and painted. Can I use the fire retardant paint successfully on this surface? Thanks!

Answer from Rawlins’ Technical Team: 

Unfortunately not, 9mm board is too thin for this system to provide 30min protection and our normal recommendation for doors that have any glazing in them is that it is replaced with fire rated glass and as long as the rest of the door meets the minimum requirements then the remaining timber elements can be upgraded withe the relevant paint system. 

questions Steven Syme on 2018-11-11 15:55:47

Hello I am interested in your product for upgrading existing doors within a property. Our fire risk assessor has recommended yourselves, do you provide a product that can be used on varnished finished doors, ie something that is clear rather than having to paint them? It would be great if you could get back to me tomorrow please. Regards Steven Syme 07710 032916

Answer from Rawlins’ Technical Team: 

See Envirograf Door Upgrade Varnish System.


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