The Debate on the Use of Accoya for Sash Window Staff Beads

Sash windows are a timeless architectural feature that has graced homes for generations. These windows are characterised by two vertically sliding panels, or “sashes”. 

An integral part of this construction involves wooden strips, referred to as staff beads, that conceal the juncture of the upper and lower sashes and are usually replaced during draught-proofing.

Historically, these windows were crafted entirely from resilient hardwoods such as oak. Nowadays, cost-effective softwoods like pine are the more popular choice for crafting modern sash windows, despite being less resistant to rot. 

This raises the question of whether it’s worth upgrading certain parts of the window, particularly the staff beads, to more durable materials like Accoya.

Understanding Accoya and Its Benefits

Accoya is a technologically-enhanced wood product derived from fast-growing softwoods like Radiata Pine. It undergoes an eco-friendly acetylation process, rendering it remarkably stable and rot-resistant. 

Boasting a 50-year guarantee against rot, Accoya outshines even tropical hardwoods in terms of performance. 

These traits have led some to advocate for its use in constructing sash window staff beads, considering this part is perceived as the window’s weak point.

Why Staff Beads May Not Require an Upgrade

Nevertheless, there is a strong case against the need for upgrading staff beads to Accoya. While the sashes are exposed to external environmental conditions, the staff beads are sheltered within the window frame.

Consequently, they face minimal risk of rot, even when made of regular softwoods, rendering the extra expenditure on Accoya or other hardwoods needless.

Choosing properly painted softwood staff beads can save homeowners a considerable amount of money without compromising on quality or lifespan. 

It is highly likely that these beads will outlive other parts of the window, even without the need for high-end wood upgrades. Therefore, unless you’re keen on achieving the pinnacle of durability, opting for standard softwoods for this concealed component of the sash window is a wise and cost-effective choice.