# Wood wall panelling

> Wood wall panelling is timber boards or panels fixed to a wall as a lining. In the EU, solid wood panelling and cladding of at least 390 kg/m³ is listed in a Commission Decision as class D-s2,d0 or D-s2,d2, depending on thickness, joints and what sits behind it. That is a different table from the one used for floors, so a floor-grade product used as a wall panel needs its own check. Wood also swells and shrinks with humidity, mostly across the growth rings.

Source page: https://www.misterendgrain.com/flooring/wood-wall-panelling/
Updated: 2026-11-10

| Fact | Value |
|---|---|
| Reaction-to-fire class (solid panelling, 12 mm total / 8 mm minimum, no air gap or closed gap) | D-s2,d0 [1] |
| Same product at 9 mm total / 6 mm minimum, no air gap or closed gap | D-s2,d2 [1] |
| Minimum mean density in the table | 390 kg/m³, conditioned to EN 13238 [1] |
| Substrate behind an air gap | At least class A2-s1,d0 with a minimum density of 10 kg/m³ [1] |
| Movement with humidity | Greatest tangentially, about half as much radially, only slightly along the grain [2] |
| Example floor-grade product listing walls among applications (Forêt) | End-grain oak, 12 mm birch plywood with an 8 mm oak top layer; applications listed: stairs, doors, wall, millwork; Cfl-s1 [4] |

Wood wall panelling is a lining of boards or panels fixed to a wall, from traditional framed panelling to tongue-and-groove cladding and modern slatted walls. The main technical questions are fire classification, movement with humidity, and what the boards are fixed to. In the EU, solid wood panelling with a minimum mean density of 390 kg/m³ is classed D-s2,d0 or D-s2,d2 depending on thickness and fixing, according to a Commission Decision [1]. That is a different table from the one for floors.

## What does wall panelling mean in practice?

The word covers several things. Solid wood pieces, with or without tongue and groove, are fixed mechanically to a batten frame. Slatted systems hold wood pieces on a support frame with air around them. Panels can also be built up from layers, as floors are. The Commission Decision treats the first two as "panelling and cladding" and "wood ribbon elements", and it describes the pieces as designed to be mounted without open joints for the panelling rows [1].

Panelling is not new. The photograph at the top of this page is a 1933 interior with oak-faced panelling on both walls, taken from a Queensland trade publication on veneer and plywood.

## How is wood panelling classified for fire?

Europe uses a common system of reaction-to-fire classes. A Swedish research report explains that it has two sub-systems, one for construction products such as wall and ceiling linings and one for floorings, and that both run from class A to class F, with A1 and A2 being non-combustible [3]. Flooring classes carry the suffix fl; wall classes do not.

For solid wood, the Commission lists products whose class is known without further testing. Table 2 of the 2006 Decision covers solid wood panelling and cladding [1]:

| Product | Minimum mean density | Thickness, total / minimum | Condition behind | Class |
|---|---|---|---|---|
| Panelling, with or without tongue and groove or profile | 390 kg/m³ | 9 / 6 mm | No air gap, or closed air gap | D-s2,d2 |
| Same | 390 kg/m³ | 12 / 8 mm | No air gap, or closed air gap | D-s2,d0 |
| Same | 390 kg/m³ | 9 / 6 mm | Open air gap of 20 mm or less | D-s2,d0 |
| Same | 390 kg/m³ | 18 / 12 mm | No air gap, or open air gap | D-s2,d0 |
| Wood ribbon elements on a support frame | 390 kg/m³ | 18 mm | Surrounded by open air on all sides | D-s2,d0 |

The table has conditions attached. The panelling must be fixed mechanically on a wood batten frame. The gap behind must be closed or filled with a substrate of at least class A2-s1,d0 and at least 10 kg/m³ density, or with cellulose insulation of at least class E. The profiled area of the exposed face must not exceed 20% of the plane area, and density is conditioned to EN 13238 [1]. A different build-up needs its own test or a different table entry.

The Decision gives the classes and the conditions; we do not reproduce the test thresholds for the smoke and droplet suffixes here. Treat a class on a data sheet as valid only for the build-up it was assessed in.

## Can a floor product be used on a wall?

Floor-type boards are sometimes fixed to walls. The classification question is real, because floorings and linings sit in different tables. The 2006 Decision lists coated wood floors in Table 1 and panelling in Table 2 [1], and the Swedish report notes that the two sub-systems are classified separately [3].

A floor class such as Cfl-s1 is therefore a statement about a floor test. It does not by itself tell you the product's class as a wall lining. One maker lists "wall" among the applications of its end-grain oak planks, which have a 12 mm birch plywood base and an 8 mm oak top layer, and states a Cfl-s1 floor rating for them [4]. If you plan a wall in a building with fire requirements, ask for the classification that applies to the wall use, and ask your building control body what it accepts. We found no source that settles this for wall use of floor-type boards.

## Why does wood panelling move?

Wood exchanges moisture with the air. The Forest Products Laboratory's Wood Handbook says wood takes on moisture from its surroundings, and that the amount depends on humidity, temperature and its current moisture [2]. It also describes wood as anisotropic: it shrinks and swells most along the growth rings (tangentially), about half as much across them (radially), and only slightly along the grain [2].

For a wall, this has three practical effects:

- Boards change in width, not length. A run of wide boards moves more in total than a run of narrow ones.
- How the board was cut decides how much of its width lies along the rings and how much across them, which changes how much it moves.
- Fixings and joints must allow for the movement, so follow the maker's gap requirements.

The same principle underlies the advice in our guide to [moisture and acclimatisation](https://www.misterendgrain.com/guides/moisture-and-acclimatisation/). Storing boards in the room before fixing is as sensible on a wall as on a floor.

## What can panelling be made from?

Solid species, laminated panels, veneered boards and end-grain tiles are all used. The table sets a minimum density of 390 kg/m³, so check the density of the species you choose; our page on [European oak](https://www.misterendgrain.com/species/european-oak/) is one place to start. Surface treatments change the look: [smoked and fumed oak](https://www.misterendgrain.com/flooring/smoked-and-fumed-oak/) is darkened through the wood, and [charred wood](https://www.misterendgrain.com/flooring/charred-wood-shou-sugi-ban/) has a blackened skin that is softer than the wood beneath. [End-grain flooring](https://www.misterendgrain.com/flooring/end-grain/) shows the ends of the growth rings and can be cut into wall tiles, and the maker above lists walls among its uses.

The construction matters for wall use. A multi-layer board has a plywood or similar base under a solid top layer, as explained in our page on [engineered wood](https://www.misterendgrain.com/flooring/engineered-wood/). You can read the build-up from the data sheet: base thickness, top-layer thickness and species.

## How do you fix wood to a wall?

The Commission Decision describes the tested fixing as mechanical, onto a wood batten frame, with the cavity behind either closed, filled or open [1]. Adhesive fixing direct to a wall is not in the table. For fixing, finishes, and substrate preparation, follow the product maker's instructions and any local fire rules. Our guide to [flooring standards](https://www.misterendgrain.com/guides/flooring-standards/) explains how European product standards define parquet and multi-layer boards, which helps when reading wall product sheets.

## What should you ask before buying?

1. Which reaction-to-fire class applies to wall use, and for which fixing, thickness and cavity?
2. What is the build-up: species, top-layer thickness, base material?
3. How should it be fixed, and what movement gap does the maker require?
4. Which finish is on the face, and is it suitable for the room's humidity?

If you are looking at end-grain oak for a wall, the maker's page for [Forêt's end-grain planks for walls and stairs](https://www.oscarono.fr/collections/foret) lists the applications and the finishes Natural, Smoke and Black [4].

## Frequently asked questions

### What fire class does solid wood panelling get?

The 2006 Commission Decision lists solid wood panelling and cladding with a minimum mean density of 390 kg/m³ as D-s2,d2 at 9 mm total thickness and D-s2,d0 at 12 mm, when fixed with no air gap or a closed air gap behind [1]. Other thicknesses and gap conditions are in the same table.

### Can I use a wood floor product on a wall?

The Decision keeps separate tables for floorings and for panelling and cladding, so a floor class such as Cfl-s1 is not the same classification as a wall class [1]. Ask the maker which class applies to wall use and whether it is evidenced. One maker lists walls among the applications of an end-grain oak floor product [4].

### Do wooden wall boards expand and contract?

Yes. The USDA Forest Products Laboratory says wood shrinks and swells most in the direction of the growth rings, about half as much across them, and only slightly along the grain [2]. Boards fixed across a wall therefore move mostly in width.

### Is the European system the same for walls and floors?

It has two sub-systems. One covers construction products such as wall and ceiling linings, the other covers floorings, which carry the suffix fl; both run from class A to class F [3].

### Does the Decision apply to stairs as well?

A footnote to the panelling table says it applies also to stairs [1]. See our page on [wood stairs and nosings](/flooring/wood-stairs-and-nosings/).

## Sources

1. [Commission Decision 2006/213/EC of 6 March 2006 establishing the classes of reaction-to-fire performance for certain construction products as regards wood flooring and solid wood panelling and cladding](https://www.legislation.gov.uk/eudn/2006/213/data.pdf), Official Journal of the European Union, via legislation.gov.uk, accessed 2026-11-10
2. [Moisture relations and physical properties of wood (Wood Handbook, chapter 4, FPL-GTR-190)](https://research.fs.usda.gov/treesearch/37428), USDA Forest Products Laboratory (Glass and Zelinka, 2010), accessed 2026-11-10
3. [European classes for the reaction to fire performance of wood floorings (Trätek report I0411026)](https://www.traguiden.se/globalassets/forskning/brand---rapporter/european-classes-for-the-reaction-to-fire-performance-of-wood-floorings.pdf), Trätek, Swedish Institute for Wood Technology Research (Tsantaridis and Östman, 2004), accessed 2026-11-10
4. [Forêt collection](https://www.oscarono.fr/collections/foret), OscarOno Paris, accessed 2026-11-10