How Long Do Timber Windows & Doors Last?

One of the most common questions people ask when considering timber windows and doors is how long they will actually last? It is a fair question, particularly when comparing timber against alternatives such as uPVC, and the answer is more positive than many people expect.

A well-made and properly maintained timber window or door can last for many decades, and in some cases for the entire life of the building it serves. Here is what affects the lifespan of timber joinery and how to get the most from your investment.

What Affects The Lifespan Of Timber Windows & Doors?

The Timber Species Used

Not all timber is equal when it comes to longevity in external applications. Hardwood species such as oak, Idigbo and Sapele are naturally more durable than softwoods, with greater resistance to moisture, rot and the stresses of repeated expansion and contraction caused by changes in temperature and humidity.

Hardwood windows and doors that are correctly specified, finished and maintained can comfortably last 50 years or more.

Softwood timber, when properly treated, primed and painted, is also a capable material for external joinery, though it typically requires more frequent maintenance than hardwood to achieve a comparable lifespan.

Engineered softwood products (which are manufactured to reduce the movement and instability that can affect solid timber) offer improved performance over standard softwood in many applications.

The Quality Of The Manufacturing

The way a window or door is made has a direct bearing on how long it will last.

Joinery manufactured using traditional techniques, with correctly proportioned sections, well-fitted joints and appropriate allowances for timber movement, will perform far better over the long term than a product that has been quickly produced to a lower specification.

The use of quality hardware (including correctly specified hinges, locks and weather seals) also contributes to the longevity of the finished product. Poorly fitted or low-quality ironmongery can cause premature wear and allow water to penetrate areas where the seal between the frame and opening should be watertight.

The Quality Of The Finish

The factory or site-applied finish on a timber window or door is its primary line of defence against moisture, ultraviolet light and the general rigours of outdoor exposure.

A high-quality factory spray finish, applied in controlled conditions to a properly prepared substrate, will adhere more effectively and last considerably longer than a brush-applied finish applied on site.

Premium paint systems such as Remmers, which are widely used by specialist joinery manufacturers, are formulated specifically for external timber and offer exceptional durability and weather resistance.

A window finished to this standard will require far less frequent repainting than one finished with standard trade paint.

How Well It Is Maintained

Maintenance is the single most important factor in determining how long a timber window or door lasts in practice. Timber that is allowed to deteriorate, with cracked or peeling paint, failed sealant or water sitting in joints, will begin to rot and fail relatively quickly regardless of how well it was originally made.

Timber that is inspected regularly, with minor defects addressed promptly and the finish refreshed before it breaks down completely, can last indefinitely.

What About Accoya?

Accoya is a modified softwood that has become increasingly popular for external joinery, and with good reason. The acetylation process used to produce Accoya fundamentally changes the structure of the timber, making it dimensionally stable, resistant to rot and far less susceptible to the moisture-related movement that can affect standard timber.

Accoya carries a 50-year guarantee against rot when used externally, making it one of the most durable timber options available for windows and doors.

How Does Timber Compare To uPVC?

uPVC windows and doors are often marketed on the basis of being maintenance-free, but they typically have a working lifespan of around 20 to 35 years before the frames begin to discolour, warp or fail.

High-quality timber joinery, correctly specified and maintained, will comfortably outlast uPVC and can be repaired and refinished rather than replaced when it does eventually require attention.

From a whole-life cost perspective, premium timber joinery often represents a better long-term investment than the cheapest uPVC alternative.

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