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Searching for fire rated cladding, fire resistant cladding, or fireproof cladding? With timber, the fire performance is typically achieved by applying a specified fire-retardant treatment to the cladding boards you choose. This means you can select the timber species and profile that suits your project, then apply treatment to meet the required specification.
This page is a buying hub. It helps you understand the treatment route, choose suitable cladding ranges, and move into a quote quickly. Fire performance depends on timber type, profile, thickness and the final installed build-up, so if you already have a target requirement, start with the treatment route and we’ll align the correct system and paperwork approach.
If you don’t know the fire requirement yet, you can still move forward by selecting the timber range and profile first. We’ll then confirm the most appropriate treatment route based on the build-up and intended use.
Start by selecting the timber category that matches your project. These ranges are commonly used for exterior cladding and can be supplied with the treatment route applied to specification.
Prefer to choose by profile first? Use the profile categories below, then confirm treatment as part of the order/quote route.
Fire-rated timber cladding is priced as the timber boards you select plus the treatment route applied to specification. The most accurate way to quote is to confirm: the timber type, the profile and thickness, approximate square metre coverage, and where it’s being installed. Once we have those details, we can confirm the correct treatment route and lead time.
If you want to move fast, send your drawing/spec (or a short description), and we’ll come back with the correct path to supply.
Fire-Retardant Treatment Route Request a Quote
For technical detail on treatment routes, testing and specification support, use: Fire-Retardant Treatment.
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Timber cladding performs best when designed as a ventilated rainscreen system rather than simply fixed directly to a wall. A drained and ventilated cavity helps manage moisture and improves long-term performance in UK weather conditions. Species choice then becomes a balance between dimensional stability, durability class and surface behaviour over time. ThermoWood cladding (Thermo Pine / Thermopine) is selected for enhanced stability and reduced movement. Siberian Larch cladding offers natural durability and strong grain character. Shou Sugi Ban wood (technique), often referred to as charred timber or burnt Japanese wood, provides a surface-stabilised architectural finish with distinct visual depth. Nordic Spruce cladding is a consistent softwood solution commonly specified for coated or treated façade systems. Where reaction-to-fire performance is part of the specification, review fire rated cladding options early, as Euroclass performance depends on the full wall build-up and treatment process. For broader façade detailing and installation context, see The Ultimate Guide to Timber Cladding in the UK.
| Feature | ThermoWood | Siberian Larch | Shou Sugi Ban (Charred Timber) | Nordic Spruce |
|---|---|---|---|---|
| Dimensional stability | High (thermally modified) | Moderate | High (surface-stabilised) | Moderate |
| Typical durability (EN 350) | Class 2–3 | Class 3 | Improved surface durability | Class 4–5 (untreated) |
| Moisture movement | Reduced | Medium | Reduced | Higher than modified timber |
| Fire treatment options | Available | Available | Available | Available |
| Typical applications | Modern façades, battens | Rainscreen, mixed-use builds | Feature elevations, architectural façades | Coated façade systems |
ThermoWood cladding is thermally modified to reduce moisture movement and improve dimensional stability. Siberian Larch cladding relies on its natural durability and dense grain structure. ThermoWood typically offers lower movement risk, while Larch provides a more pronounced natural character.
Shou Sugi Ban wood, also known as charred timber or burnt Japanese wood, forms a carbonised surface layer. Depending on the finish level (brushed, sealed or stained), periodic inspection is recommended. Sealed systems require maintenance similar to other coated cladding systems.
Timber cladding can be supplied with fire-retardant treatment to achieve improved European reaction-to-fire classifications. The final Euroclass rating depends on the species, treatment process and complete wall build-up. Always confirm the required classification with building control before specification.
Service life depends on species, detailing and exposure. Thermally modified timber and naturally durable species such as Siberian Larch typically provide long above-ground service life when installed as a ventilated rainscreen system with correct ground clearance.
Yes. All exterior timber, including ThermoWood, Larch and Nordic Spruce, will gradually weather to a silver-grey tone if left untreated. This colour change does not reduce structural performance and can be managed with UV-protective coatings if colour retention is required.