✓ Can be treated
Raw, untreated timber
- Bare internal timber cladding
- Bare external timber cladding
- Existing bare cladding
- Loose boards before installation, where approved
Timber cladding treatment · UK-wide
Fire retardant treatment for timber cladding
We apply fire retardant impregnation treatment to raw, untreated timber cladding on site across the UK. Your BS EN 13501-1 B-s2,d0 treatment certificate is supplied after completion and payment.
- ✓ Raw, untreated timber
- ✓ UK-wide on-site service
- ✓ B-s2,d0 certification
Raw timber only
Untreated and absorbent
Euroclass B-s2,d0
BS EN 13501-1 classification
UK-wide treatment
Completed on site
Treatment certificate
Supplied after completion and payment
Timber suitability
Can your timber absorb the treatment?
We can treat raw, untreated timber that can absorb the impregnation product. Painted, varnished, oiled, stained or sealed surfaces cannot be treated with this system.
× Not suitable for this service
Finished or sealed timber
- Painted timber
- Varnished or lacquered timber
- Oiled, stained or water-repellent surfaces
- Any finish that prevents consistent absorption
Unsure about the finish?
Send the timber specification and details of any product previously applied. We will tell you whether an impregnation treatment is possible.
Understanding the classification
Understanding B-s2,d0
BS EN 13501-1 describes how the treated timber reacts when exposed to fire.
It is a reaction-to-fire classification, not a 30- or 60-minute fire-resistance rating for a wall or structural assembly.
BLimited contribution to fire
s2Smoke production classification
d0No flaming droplets or particles
On-site impregnation treatment in progress
Treatment options
Installed cladding or timber awaiting installation
Installed claddingMost of our work involves raw timber cladding that is already in place. We apply the measured impregnation treatment on site.
New-build projectsWe can treat loose timber at the client’s site before installation where the proposed system has been accepted by the project specifier. We do not provide factory pressure treatment.
A straightforward service
From timber details to certification
- 01Send the timber details
Tell us the timber type, approximate area, whether it is raw and untreated, and the site address.
- 02Receive your quote
We confirm suitability, price and treatment arrangements.
- 03We complete the treatment
The impregnation treatment is applied consistently to the agreed timber area.
- 04Receive your certification
Your BS EN 13501-1 B-s2,d0 documentation and treatment certificate are supplied after completion and payment.
Suitable raw timber prepared for treatmentDocumentation
Your B-s2,d0 treatment documents
You receive the supporting documents needed for your project records.
01Manufacturer’s classification
The BS EN 13501-1 B-s2,d0 classification and its conditions.
02Treatment certificate
Confirmation of the site, timber, product and completed treatment.
Your quotation
What to send for a quote
Send the following details and we’ll confirm suitability and prepare an individual quotation.
- Timber species or product details, if known
- Confirmation that it is raw and untreated
- Approximate square metres and faces requiring treatment
- Whether it is installed or awaiting installation
- Site address including postcode
- Plans or photographs if helpful
Retrospective timber upgrade
The Roundhouse, Newark-on-Trent
Fifteen-year-old Thermowood cladding required a Euroclass B upgrade following a property survey. We completed the specified treatment on site using high-level access equipment.
Read the project15 yearsExisting cladding upgraded retrospectivelyCherry pickerHigh-level treatment completed at an occupied property
Common questions
Timber cladding treatment FAQs
For advice about your timber, send us the material and finish details.
View all FAQs →What timber can you treat?
We treat raw, untreated timber that can absorb the impregnation product, including internal and external timber cladding.
Can you treat painted, varnished or sealed timber?
No. Paint, varnish, oil, stain and other sealers prevent the impregnation product from being absorbed consistently.
Does this provide 30 or 60 minutes of fire protection?
No. This service concerns reaction-to-fire classification under BS EN 13501-1 and does not provide a 30- or 60-minute fire-resistance rating for a structural element or construction.
What documentation will we receive?
We provide the manufacturer’s BS EN 13501-1 B-s2,d0 classification documentation and our Certificate of Fire Retardant Treatment.
Timber treatment and certification
Tell us about your timber
Send the timber details, approximate area and site address. We’ll confirm suitability and provide a clear quotation.