Timber has always brought a warmth and character to architecture that is difficult to replace, yet concerns around movement, durability and maintenance have often made it the riskier choice. Accoya® is changing that conversation, giving architects the opportunity to reconsider what is possible with timber.
What If Timber Didn't Have to Be the Risky Choice?
For many architects, the appeal of timber has never disappeared.
There is a warmth, texture and natural character to timber that is difficult to replicate. It can soften architecture, connect a building to its landscape and bring a richness to windows, doors, cladding and other architectural elements that alternative materials simply cannot reproduce.
And yet, somewhere along the way, timber became the material many designers admired — but hesitated to specify.
Why did we stop considering timber?
The reason is understandable.
Traditional timber moves. It absorbs and releases moisture as environmental conditions change, causing swelling and shrinkage. Over time, this movement can contribute to warping, sticking doors, opening joints, coating failure and increased maintenance.
For an architect responsible not only for how a building looks on completion, but how it performs years later, these are significant considerations.
As a result, materials such as aluminium have increasingly become the default choice for windows, doors and many exterior architectural applications.
Not necessarily because they deliver the aesthetic the architect originally wanted, but because they are perceived as the safer, more predictable option.
And perhaps that is where the conversation around timber needs to change.
Accoya® changes the equation
Accoya is natural timber, but it does not behave like conventional timber.
Through a process called acetylation, the wood is modified at a cellular level, significantly reducing its ability to absorb water — one of the primary causes of swelling, shrinkage and dimensional movement in wood.
The result is an exceptionally stable and durable timber that retains the natural beauty and workability of wood while addressing many of the performance concerns that have traditionally made architects hesitant to specify it.
For architects, that distinction is important.
It means the material conversation no longer needs to begin with:
"Timber would look beautiful here, but..."
Instead, timber can genuinely be considered alongside other high-performance architectural materials from the beginning of the specification process.
Stability creates design freedom
Perhaps one of the most exciting aspects of Accoya is not simply that it lasts longer.
It is what its stability allows architects to do with timber.
Large-format sliding doors. Expansive entrance doors. Fine architectural joinery. Wide cladding boards. Screens. Pergolas. Garage doors. Windows and façades with clean, consistent detailing.
Where movement would traditionally place limitations on timber design, Accoya's exceptional dimensional stability gives architects considerably greater freedom.
The material is no longer dictating the design to the same extent.
Instead, the design can lead.
Performance that can be specified with confidence
Accoya's performance is not simply based on claims about being a "better timber".
It has undergone extensive independent testing and is classified as Class 1 for durability. It carries a 50-year warranty against rot and decay for above-ground applications and 25 years in-ground or freshwater.
Its dimensional stability also reduces stress on coatings, with independent testing showing significantly extended coating performance compared with conventional timber.
That translates into something particularly important in architecture: predictability.
A timber window should continue to operate properly.
A large door should remain stable.
Cladding should retain the integrity of its detailing.
A painted finish should not be fighting constant expansion and contraction beneath it.
And the material specified on the drawing should continue to perform long after the building has been handed over.
Perhaps timber deserves to move back up the specification hierarchy
The conversation should not be timber versus aluminium.
There are projects where aluminium is absolutely the right material.
But there are also projects where timber would be the architect's preferred material aesthetically, contextually or environmentally — and where it may never make it beyond the first design conversation because of assumptions based on how conventional timber performs.
Accoya gives us an opportunity to reconsider those assumptions.
Because when timber becomes more stable, more durable and more predictable, the decision hierarchy changes.
Instead of:
"Timber is beautiful, but let's rather use aluminium."
The question becomes:
"Could we use timber here?"
And for architects who want the warmth and character of natural wood without accepting the traditional compromises associated with it, that is what makes Accoya worth considering.
Accoya doesn't simply make timber last longer.
It makes it possible to think differently about where timber belongs in modern architecture.