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Underpinned by our Scandinavian design heritage, we bring you regular stories about architecture and interiors, exploring natural materials, acoustics, and the creation of safe and harmonious environments.
Many wood species that have historically defined architectural interiors – such as teak and other tropical hardwoods – are today increasingly restricted or unsuitable to use. Sustainability requirements, traceability and availability have fundamentally changed how materials can be specified. This is particularly relevant in acoustic architecture, where material choice directly affects both sound performance and spatial experience.
For architects and clients, this creates a clear tension. The desired visual expression is often well established, but the material traditionally used to achieve it is no longer a viable option. At the same time, the technical demands remain unchanged. Acoustic performance, fire safety and long-term durability must still be achieved.
Replacing a material in this context is not simply a matter of selecting another wood species. Without careful consideration, the result can quickly lead to compromises that affect both design and function.
-Loss of visual depth, variation and material character.
-Inconsistent appearance across large surfaces.
-Reduced acoustic performance due to reflective surfaces.
-Difficulty meeting fire and technical requirements.
In large public environments, these issues are not only visible – they are experienced.
In projects such as House of People, this challenge becomes particularly clear. The architectural intent called for a warm, expressive wood surface with the depth and variation associated with classic materials like teak. This approach is also relevant in renovation and transformation projects, where original materials must be respected while meeting modern performance requirements.
Rather than compromising, the approach was redefined. By working with oak and developing a carefully controlled staining and finishing process, it became possible to recreate the visual qualities of more restricted wood species.
Deep understanding of wood structure and grain behaviour
Precise control of pigmentation and surface treatment
Consistent results across large-scale production
Through pigmented lacquers and refined finishing techniques, the material achieves a visual expression close to traditional hardwoods – while remaining sustainable and available.
To achieve this, the material cannot be treated as an isolated surface.
The solution is not only visual. The treated wood surface is part of a complete acoustic system, where material and performance are developed together.
The surface design controls how sound interacts with the material
Acoustic backing absorbs sound energy
The overall build-up ensures predictable acoustic performance
This integration allows the material to support both architectural expression and acoustic function.
This system-based approach is central to how Gustafs develops its solutions. You can explore how these systems are structured here:
One of the most important outcomes of this approach is the ability to maintain the original design vision.
Rather than introducing visible compromises, the solution allows the architecture to remain intact while meeting modern requirements.
Visual identity
Acoustic performance
Fire safety and durability
This is particularly important in public environments, where both experience and functionality are critical.
This approach is particularly relevant in renovation projects, where existing architecture must be preserved while performance is upgraded. In projects such as St Per’s School auditorium and historic environments like Stockholm City Hall, acoustic solutions need to integrate with the original structure, respecting both materiality and architectural identity while meeting modern requirements.
The move away from red-listed wood species reflects a broader shift in architecture. Material selection is no longer defined by appearance alone, but by how well it responds to multiple demands.
Today, decisions must balance sustainability and responsible sourcing, availability and long-term viability, as well as technical and acoustic performance. This development requires closer collaboration between architects, suppliers and engineers – and a deeper understanding of how materials perform beyond their visual qualities.
Ultimately, this is not just about replacing one material with another. It represents a shift from material dependency to system knowledge. By combining an understanding of wood and its natural variation with advanced surface treatment techniques and engineered acoustic systems, it becomes possible to solve complex challenges without compromising on design.
To meet both architectural expectations and modern requirements, Gustafs has developed a range of alternatives to red-listed veneer species.
One example is Gemini, a concept based on naturally sourced veneers that are carefully colour-adjusted to achieve a consistent and refined expression. In addition, natural veneers can be further developed using pigmented lacquers, allowing the surface to replicate the tone and depth of more restricted wood species.
This approach makes it possible to achieve the desired architectural expression – without relying on restricted wood species.