Slat panels: soundproofing or just decoration
A slat panel with felt behind it absorbs echo inside a room but does not insulate sound between rooms. These are two different things. Absorption reduces reverberation: voices and music sound cleaner and the room stops ringing. Insulation stops sound passing through a wall, and that needs mass and airtightness in the construction, not slats.
Slats alone only scatter sound. The backing absorbs it: polyester acoustic felt, mineral wool or a porous layer behind the slats, and the denser the backing and the wider the gaps between slats, the better it works. So panels go in living rooms, home cinemas, studies and bedrooms where echo needs damping, and neighbours behind a wall are protected by a separate construction. More on this distinction in our article on acoustic comfort.
Veneer or solid wood for slats
For walls, veneered slats are used: an MDF or plywood core with natural oak, walnut or ash veneer 0.6 mm thick. They are dimensionally stable, do not warp and colour is uniform within a batch. Plywood suits ceilings and complex forms; MDF suits flat walls.
Solid wood looks better close up, especially at the edge, and can be sanded and renewed. But it moves with humidity, and long slats in Barcelona swell in summer and open gaps in winter. So solid wood is fixed with tolerances and slat width is kept under 40 mm. If you are not in the home all year, humidity swings more and veneer is more dependable. For dark species veneer is better: colour does not vary by batch.
A felt-backed panel or joinery made on site
A ready-made panel, for example slats glued onto acoustic felt in 2.4 × 0.6 m sheets, goes up quickly: adhesive and screws to a flat wall. It is inexpensive, brings a factory acoustic effect and suits long walls of simple geometry. Slats on such panels are usually 20–30 mm in section with a 10–20 mm gap.
Joinery made on site gives what sheets cannot: a continuous pattern across the whole wall with no joints between panels, fitted corners, non-standard spacing, slats of varying thickness and integrated niches, shelves and doors. The frame goes on metal profiles and the wood is fixed invisibly. For a luxury interior this is the route: on a 3 m wall the joint between panels shows, and joinery makes the wall a single plane. Cost and lead time are higher and the joiner needs an exact drawing.
How to hide a door in a slat wall
A hidden door in slats is made as part of the panel: the leaf is clad in the same slats at the same spacing, with concealed hinges and no handle or a recessed one. Slats on the door and wall must run uninterrupted, and the 3–4 mm perimeter gap becomes a shadow gap that reads as one of the gaps between slats. To achieve this the slat pitch is calculated so the door joint falls on a gap, and it is adjusted on the drawing.
The door opens by push-to-open or a magnetic catch. In our 250 m2 children's psychology centre in the Eixample there were 24 concealed doors, and that project shows the main rule: joint position and slat height are decided at drawing stage, not on site. A door like this neatly hides a wardrobe, a bathroom or service niches, so the wall stays whole.
Lighting and integration into wall and ceiling
Lighting is planned into the frame before panels go up. An LED strip behind the slats gives soft diffuse light and emphasises relief, and a linear fitting in a niche at the ceiling washes down the slats. Check colour temperature: warm light, 2700–3000 K, brings oak and walnut veneer to life; cold light turns wood grey.
On a ceiling, slats on a frame can hide ventilation grilles, speakers and sensors. Sockets and switches are planned in advance: either recessed flush into the panel or moved to adjacent plain walls. Everything cut into the slats is done before finishing, because veneer does not forgive trimming on site. The electrician, the joiner and the designer work from one drawing.
Will dust collect between slats, and what about fire rules
Dust settles on the backing, not between the slats: a dark felt hides it, a light one shows it. Every few weeks the slats are vacuumed with a soft brush and each season wiped with a dry cloth. In dust-prone spots, such as near an entrance, a wider gap and a dark backing are chosen.
In public areas (clinic, office, shop, hotel) fire requirements under CTE DB-SI apply: wall and ceiling linings must meet a given reaction-to-fire class. Ordinary wood does not always meet it, so panels with fire-retardant treatment are used, with a Euroclass certificate for the whole system including the backing. A home has no such requirement, but in shared corridors of the building and restaurant areas the fire treatment must be documented.
How BCN YARD can help with slat panels
Wood slat panels feature, for example, in our Urgel apartment in the Eixample (109.80 m2). We draw the slat layout, agree the sample, plan doors and lighting with the joiner and run the installation. We work in Russian and Spanish, under contract with staged payments. Send us the floor plan and we will reply within an hour.
Frequently asked questions
What slat spacing to choose?
For acoustic effect use a 10–20 mm gap with slats 20–30 mm in section; for a decorative wall the gap can be narrower. The wider the gap, the better the backing works, but the more the background shows. Decide from a 1 × 1 m sample under your own light, not from a catalogue.
How are slats stained or painted?
Veneered slats are best stained and oiled or lacquered at the factory or workshop for an even colour. Painting on site leaves runs in the gaps. If you want a colour matching the wall, slats are painted in a closed workshop before installation. Oil can be renewed; lacquer cannot.
Can slat panels go in a bathroom?
Yes, outside the shower zone and with good extraction: a moisture-resistant core and lacquer are needed and the edges sealed. For showers, teak or iroko with oil is chosen. Unprotected MDF and veneer will not do, because they swell. Ask the panel manufacturer about permissible humidity.