ACCOYA Windows and Doors

Accoya Timber for Window Manufacturing

Accoya is a high-performance, sustainably sourced timber that has been modified through a process called acetylation. This treatment changes the wood at a molecular level, making it exceptionally durable, stable, and resistant to rot, swelling, and shrinkage. Unlike traditional timber, Accoya doesn’t warp or distort when exposed to changing weather conditions, which is a major advantage for window frames.

Because of its outstanding dimensional stability and longevity, Accoya windows maintain tight seals, smooth operation, and a high-quality finish for many years with minimal maintenance. Additionally, Accoya is non-toxic and environmentally friendly—it’s made from fast-growing, FSC®-certified softwood and has one of the lowest carbon footprints of any building material.

Overall, Accoya combines the natural beauty of wood with the durability of the best man-made materials, making it an ideal choice for manufacturing long-lasting, energy-efficient timber windows.

The 60-Year Service Life of Accoya and Its Importance for Windows

Accoya timber is renowned for its exceptional 60-year service life above ground, as proven by independent testing and certification. This longevity means that windows made from Accoya can last for decades without significant deterioration, even in harsh weather conditions.

A long service life is especially important for windows, as they are constantly exposed to moisture, temperature changes, and UV radiation. With Accoya, homeowners and builders benefit from windows that resist rot, swelling, and warping, ensuring they continue to open, close, and seal properly over time.

This durability not only reduces the need for frequent repairs or replacements but also makes Accoya a more sustainable and cost-effective choice. Fewer replacements mean less material waste and lower maintenance costs—delivering lasting performance and peace of mind

Low Maintenance Benefits of Accoya

Accoya timber is exceptionally low maintenance, making it an ideal choice for windows and exterior joinery. Thanks to its outstanding dimensional stability, Accoya doesn’t warp, shrink, or swell like traditional softwoods. This stability means that paint and coatings adhere better and last significantly longer.

As a result, you can enjoy much longer intervals between redecorations compared to conventional softwood timbers—often double the time. This not only saves on maintenance costs and effort but also keeps windows looking fresh and performing well for years. With Accoya, homeowners benefit from a beautiful, long-lasting finish that requires minimal upkeep.

Why Accoya’s Stability Matters for Windows and Doors

Accoya is known for its exceptional dimensional stability—it virtually doesn’t move, even when exposed to moisture or temperature changes. This is because the acetylation process alters the wood’s structure, greatly reducing its ability to absorb water.

For windows and doors, this stability is a major advantage. It means frames and sashes won’t swell, shrink, or warp with the seasons, ensuring they continue to open and close smoothly and maintain tight seals. This prevents drafts, reduces maintenance, and keeps paint finishes intact for longer. In short, Accoya’s minimal movement ensures lasting performance, reliability, and a consistently high-quality appearance.

Retained Density and Strength of Accoya

Accoya retains the natural density and strength of the original timber, even after undergoing the acetylation process. This means it remains strong, stable, and suitable for demanding applications such as windows, doors, and structural joinery.

Unlike some modified woods that can become brittle, Accoya maintains its toughness and resistance to wear, providing excellent structural integrity over time. This combination of strength and durability ensures that Accoya components perform reliably for decades, supporting precision joinery and long-term use without compromising on stability or appearance.

Quality of Finish

Accoya provides an exceptional surface for finishing, resulting in a smooth, high-quality appearance. Its superior stability means coatings adhere evenly and stay intact much longer than on traditional softwoods. Because Accoya doesn’t swell or shrink with changes in weather, paint and stain finishes are less likely to crack, peel, or flake.

This not only enhances the visual appeal of windows and doors but also reduces the need for frequent maintenance. The result is a consistently beautiful, long-lasting finish that highlights both the natural quality of the wood and the craftsmanship of the product.

Accoya’s Resistance to Termites

Accoya is naturally resistant to termite attack, offering a level of protection that far exceeds that of conventional timbers. The acetylation process alters the wood’s chemical structure, making it inedible to termites and other wood-destroying insects.

This built-in resistance means Accoya is an excellent choice for windows, doors, and exterior joinery—especially in areas where termite activity is a concern. With Accoya, you can be confident that your timber will remain strong, stable, and free from insect damage for decades.

Sustainably Sourced Accoya

Accoya is made from sustainably sourced timber, ensuring it’s an environmentally responsible choice for joinery and construction. All Accoya wood comes from fast-growing, renewable forests and is fully certified by the Forest Stewardship Council (FSC®).

This certification guarantees that the timber is harvested in a way that protects forests, wildlife, and local communities. Combined with its long lifespan and low maintenance requirements, Accoya offers an outstanding balance of performance and sustainability—making it the ideal choice for eco-conscious