Timber cladding upgraded to BS EN 13501-1 Class B

Fire Retardant Treatment for Timber Cladding

Certified BS EN 13501-1 Class B Fire Protection – UK-Wide Service

Upgrade your timber cladding with expert fire retardant spraying to meet BS EN 13501-1 Class B standards. Our on-site service helps ensure compliance with UK fire safety regulations while protecting your property from the spread of flame.

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Quick Guide to BS EN 13501-1 Class B Standards

This guide simplifies the process of determining when your building needs fire-resistant cladding.

Residential Buildings Over 11 Metres

Requirement:

Class A2-s1, d0 or better (BS EN 13501-1)

This means timber cladding is generally not permitted unless it can be proven to meet Class A2-s1, d0, which is essentially non-combustible.

Typical timber (even treated) cannot meet this without special systems or encapsulation.

Smaller Residential Buildings Near Property Boundary

11m or less (e.g. houses, bungalows) less than 1m from boundary:

Class B-s3, d2 or better (BS EN 13501-1)

1m or more from boundary:

No specific performance requirement

Assembly and Recreation Buildings

More than 18m:

Class B-s3, d2 or better
From ground to 18m: minimum Class C-s3, d2
From 18m and above: Class B-s3, d2 or better

18m or less:

Up to 10m above ground level: Class C-s3, d2 or better
Up to 10m above any roof or publicly accessible area: Class C-s3, d2 or better
Above 10m: No minimum fire performance

For full details, refer to Approved Document B.

Is Your Timber Cladding Suitable for Surface Fireproofing?

Before we begin fireproofing, it’s essential to ensure your timber cladding meets the minimum requirements for surface treatment.

✅ Minimum Thickness: Timber must be at least 12mm thick for our fire retardant application to be effective and compliant.

✅ Ventilated Cavities: If there’s a ventilated cavity behind the cladding, fire barriers must be installed.

This is often required by building control to prevent fire spreading behind the cladding system.

These checks are important for regulatory approval — especially when surface-only fireproofing is used instead of full encapsulation or A2-rated systems.

Fire retardant upgrade services for timber cladding

Efficient, Effective & Certified Solutions

We provide expert fireproofing services to upgrade timber cladding in line with UK and EU fire safety standards. Using high-performance materials and proven application methods, we ensure reliable and long-lasting protection.

Image of wood with fire retardant droplets representing impregnation Class B fire treatmen

Impregnation Fire Retardant Treatment (For Bare or Thermo-Treated Timber)

Long-Term Protection with No Maintenance Required

Ideal for untreated wood, our deep impregnation treatments lock fire-resistant polymers into the timber structure, delivering:

✅ Permanent fire protection with no future reapplication needed
✅ Preserved natural look — no coating or surface film
✅ Even, consistent absorption across all treated surfaces

Image of intumescent paint being applied to timber cladding to achieve Euroclass B

Intumescent Coating for Painted or Varnished Timber

Robust Fire Protection for Finished Cladding

If your timber is already coated or sealed, our multi-step intumescent system achieves Euroclass B certification without altering its structural integrity:

Adhesion Primer – Prepares the surface for bonding
Intumescent Paint – Expands under heat to form a protective barrier
Topcoat – Adds durability and weather resistance (available in clear or tinted finishes)

✅ Suitable for external or internal cladding
✅ Maintains or enhances existing aesthetics
✅ Fully compliant with BS EN 13501-1 Class B-s1, d0 standards

Transparent Pricing for Your Cladding Fireproofing

No Hidden Costs – Just Clear, Tailored Quotes

We provide detailed cost estimates based on your specific project needs, including:

Type of treatment – Impregnation for bare timber or intumescent coating for pre-finished surfaces
Project size & complexity – Total m², height access, and location
Site-specific logistics – Travel distance, access conditions, or special requirements

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Image depicting Class B project timeline

Project Timelines and Process

Efficient Scheduling, Minimal Disruption

We tailor each project timeline to suit your specific needs and the type of fire retardant treatment:

Impregnation Treatments – Quick to apply with minimal drying time, ideal for untreated timber.
Intumescent Coatings – Involve multiple layers and require drying and curing time between coats.

Our team works closely with you to schedule the work efficiently — ensuring minimal disruption to your operations or daily routines.

Accurate Measurements Help Streamline Your Project

To provide the most precise quote and schedule, we ask clients to measure their timber cladding before we begin.

Don’t worry — we’ll guide you through it.

✅ Record total square metres (m²)
✅ Note cladding height, location, and any access issues
✅ Indicate wood type and existing finishes (painted, varnished, bare)

Need help? Our team is always available to assist with the measuring process and ensure everything is correct before work begins.

image of stamp of authority to represent our certification of fire retardant services

Certified Fire Safety Compliance for Peace of Mind

Comprehensive Documentation for Every Project

Upon completion of your timber cladding treatment, we provide full certification that includes:

✅ The fire retardant product used
✅ Fire classification achieved (e.g. BS EN 13501-1 Class B)
✅ Authorised signature from our certified technician

This certificate supports compliance with building regulations and satisfies insurance and fire officer requirements — giving you complete peace of mind.

Proven Success: Explore Our Timber Cladding Case Studies

Real Projects. Real Compliance. Nationwide Results.

We’ve helped clients across the UK upgrade their timber cladding to meet BS EN 13501-1 Class B standards. Here are just a few examples:

The Roundhouse building that received fire retardant treatment for timber cladding to Cla

The Roundhouse – Nottingham

Using high-performance impregnation sprays and specialist equipment, we treated extensive timber cladding surfaces to achieve full Class B compliance.

Residential Upgrade – King’s Lynn

This boundary-adjacent property required precise surface-only treatment to meet compliance. Our experienced team delivered a tailored, fully certified result.

Fireproofing Gable End Larch Timber Cladding

Safety and Quality: Our Top Priorities

Trusted Standards. Proven Results.

We deliver fireproofing treatments with a strong commitment to safety, precision, and environmental responsibility:

Optimal Application Conditions – Treatments are applied under carefully controlled conditions, factoring in temperature, humidity, and surface condition for best results.
Rigorous Quality Assurance – Every project undergoes thorough checks and testing to ensure reliable, long-lasting fire protection.

Your safety is our standard — not a feature.

Stay Compliant with Fire Safety Regulations

Expert Support for Navigating Building Codes and Standards

Fire safety regulations can be complex — but we simplify the process with end-to-end support:

Expert Guidance
We keep you informed about the latest updates in UK fire safety standards, including those affecting timber cladding and structural wood.
Tailored Compliance Strategies
Every building is different. We design bespoke fireproofing solutions to suit your property and regulatory requirements.
Seamless Certification
Upon completion, you'll receive detailed documentation, including the fire retardants used, fire rating achieved (e.g. BS EN 13501-1 Class B), and signed verification.
Ongoing Regulatory Support
Need clarity on legal obligations or future regulatory changes? Our experts are available to guide you through compliance — now and as standards evolve.

Adam our fire retardant spraying expert standing with a works van

Get in Touch: Consultation and Quotes

Ready to protect your property with certified fireproofing?

Our Satisfied Clients

Clients who have experienced first-hand the quality and reliability of our cladding upgrade services.

FAQs: Your Questions Answered

What is BS EN 13501-1 Class B fireproofing? It’s a European fire safety classification that ensures materials like timber cladding are resistant to flame spread.
How long does the treatment last? Impregnation treatments are permanent, while intumescent coatings may require periodic maintenance.
Can treatments be done on-site? Yes, we provide on-site fireproofing with both impregnation and intumescent systems.

Learn More On Our FAQs