• Envirograf Thermal Cavity Barriers

Envirograf TCB Thermal Cavity Barriers

Product 55 - TCB

We no longer stock this product.



Thermal Cavity Barriers are used around window and door apertures, offering both fire and thermal protection. Made from flexible fireproof sponge, fixed to a thin, foil-faced intumescent strip that expands in fire. Ideal for timber-framed buildings.

  • Refer to sizes below
  • Waterproof
  • Moisture resistant
  • Fixed easily with clout nails
  • Can be cut to size
  • Available in 1m and 2m lengths


Available in 1 metre and 2 metre lengths.

Ref Cavity Width Foiled Fixing Width Sponge Thickness
TCB/A 50mm 120mm 30mm
TCB/B 50mm 150mm 30mm
TCB/C 80mm 120mm 30mm
TCB/D 80mm 150mm 30mm
TCB/E 100mm 120mm 30mm
TCB/F 100mm 150mm 30mm

Envirograf TCB Thermal Cavity Barriers are an ideal solution to window and door apertures, particularly in timber-framed buildings, providing thermal protection in the cavity and fire protection for up to an hour. Creating an effective thermal barrier between cavities and window/door frames, thermal cavity barriers are completely waterproof and moisture resistant.

The 30mm-thick fireproof sponge is fixed to a thin foil-clad strip of intumescent material that expands in a fire to seal gaps, preventing the spread of smoke and fire. This can give more time for evacuation in an emergency, and helps contain a fire to prevent more damage.

The cavity barriers are available in 1m and 2m lengths and at different widths, depending on the cavity size.

Examples of Use

With rising energy costs, it is now vital to ensure homes and businesses are properly insulated to reduce escaping heat energy, keeping spaces warmer for longer. Gaps and reveals in door and window frames can lead to significant heat loss as well as damp issues, resulting in lengthy and costly repairs in the future.


Simply cut to the length required and fix using clout nails at 6 inch (150mm) centres.

Envirograf Fire Cavity Barriers should be fitted by experienced professionals to ensure they are installed correctly. Products can only be guaranteed by Envirograf if fitted correctly and incorrect installations will be condemned if inspected. Check labels, fixing brackets, manufacturer installation instructions, etc. Should a site visit be required to check installation, this can be arranged upon request but will be chargeable.

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 ConditionsWe 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.

Any Envirograf products to be used in or for Harrods department store should be authorised with our Technical Team prior to purchase.

Product Details
Product 55 - TCB

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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