What is fire retardant cladding?

It is timber treated to improve its reaction to fire so it can meet a required classification. The result depends on the product and how it is installed.

Which fire class will my cladding achieve?

This depends on the exact product, thickness and installation, so check the test certificate supplied. Confirm what is needed with your designer and Building Control.

Can I paint or oil fire retardant cladding?

Sometimes, but coatings can affect performance. Check the certificate and ask the supplier before applying anything.

Do I still need a ventilated cavity?

Usually yes, with insect mesh, but cavity barriers and details may be specified for fire. Follow the design and certificate requirements.

Do I need to treat cut ends?

Treatment guidance may require re treating cut or drilled areas. Check the supplier instructions and plan cuts to minimise this.

Fire Retardant Cladding

Fire retardant timber cladding and fire treatment for wood cladding on homes, extensions, garden rooms and commercial buildings. Treated timber can achieve improved reaction-to-fire classes such as Euroclass B to help meet Building Regulations. Expert advice and free UK delivery.

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HR Prof fire treatment for timber cladding

Upgrade the fire performance of your wood, both internally and externally, with HR Prof. Our premium water-based fire retardant offers complete protection against burning and ignition while prolonging the lifespan of exposed timber under various weather conditions. HR Prof is environmentally friendly and safe for humans and animals, eliminating the need for protective finishing coats. The product is compatible with most wood species, with consumption rates of 270 ml/m² for standard species and 360 ml/m² for Western Red Cedar.

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£198.51

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Fire retardant cladding explained

Untreated timber cladding typically achieves Euroclass D. In some situations, Building Regulations Approved Document B (and the equivalents in Scotland, Wales and Northern Ireland) require external walls to meet a higher reaction-to-fire performance, for example where a building is close to a boundary or for certain building types and heights. Fire retardant treated cladding is impregnated or coated with a fire retardant that slows ignition and flame spread, allowing timber to reach classes such as Euroclass B-s1,d0 or C.

When do you need fire retardant cladding?

Walls within 1m of a boundary.
Some commercial, residential and public buildings, depending on use and height.
Escape routes and some internal applications.
Where specified by your architect, fire engineer or insurer.

Rules depend on the building, so always confirm requirements with Building Control. Note that in England combustible materials, including treated timber, are banned from the external walls of relevant buildings 18m and over, and restricted on some residential buildings over 11m.

Our fire retardant options

HR Prof fire treatment is a fire retardant treatment for timber cladding. Fire retardant treated cladding achieving Euroclass B can be supplied to order, with certification for your Building Control submission. Contact us with your project details for advice.

Installing and maintaining treated cladding

Install as normal cladding with a ventilated cavity. If you cut boards, treat cut ends as the manufacturer instructs, and use only compatible top-coat finishes so the fire performance is not affected.

Fire retardant cladding FAQs

What Euroclass is untreated timber?

Most untreated softwood and hardwood cladding is Euroclass D-s2,d0.

Can fire retardant cladding be stained or painted?

Usually yes, with a compatible finish. Check the treatment manufacturer's guidance.

Does fire treatment change the look of the timber?

Most modern treatments are clear or leave only a slight tint.

Read our fire retardant cladding guide or see external timber cladding.

Fire Retardant Cladding FAQs

Common questions about our fire retardant cladding specifications, applications, and ordering.