Timberlook & Timberweld Technology: The Secret Behind Authentic Heritage Windows

Look closely at most uPVC windows and you’ll spot their defining feature: diagonal weld marks running across each corner. These tell-tale lines immediately identify the window material as modern rather than traditional timber.

But there are ways to cleverly disguise uPVC construction, making your windows look just like timber window designs without the upkeep and cost.

Below, we’ll explore the beauty of wood-effect windows, and how even the smallest details can make a huge difference.

What makes uPVC construction different to timber?

Real timber windows feature clean, perpendicular joints where horizontal and vertical frame members meet at right angles—the hallmark of mortise and tenon joinery.

Replicating this traditional method of jointing in uPVC has long been the industry’s challenge, with conventional designs falling short. uPVC window manufacturing relies on heat welding. Whilst this creates strong, weather-resistant corners, it leaves a tell-tale diagonal weld mark across each corner of the frame. These mechanical corners are the signature of conventional designs and immediately identify a window as modern uPVC rather than authentic timber.

However – Timberweld technology changes everything. This advancement in uPVC fabrication creates authentic traditional timber appearance by eliminating diagonal welds entirely.

At Timberlook, we are dedicated to providing one of the most authentic wood-effect windows on the market – and we’ve harnessed the Timberweld process to deliver heritage aesthetics that satisfy conservation officers, provide beautiful heritage charm and replicate timber window design perfectly.

What is Timberweld?

Timberweld is a patented corner-joining technique for uPVC windows that replicates the perpendicular joints found in traditional timber frames. This innovative process eliminates diagonal weld marks, creating authentic mortise and tenon-style corners on both sides of the frame whilst ensuring weather-tight sealing that prevents moisture penetration and air leakage.

Why do window joints matter?

For homeowners with traditional preferences—particularly those in conservation areas—uPVC diagonal welds spoil the heritage aesthetic entirely. They’re especially noticeable on larger windows and can look out of place on period properties or even most contemporary developments where architectural integrity matters.

Planning officers in conservation areas often reject windows with visible diagonal welds because they fail to replicate the authentic timber butt joint effect found in original period windows.

The beauty of wood-effect uPVC windows

Wood-effect uPVC windows offer a perfect solution for homeowners seeking the aesthetic appeal of traditional wood without the drawbacks. Timber windows require regular maintenance, are susceptible to rot and warping, and come with higher costs over their lifetime. By contrast, uPVC windows deliver superior performance in thermal efficiency and security whilst remaining virtually maintenance-free.

Our Timberlook range of windows

At Timberlook, we utilise Timberweld technology across our range of wood-effect uPVC windows, creating an exceptional product that serves both historic properties and contemporary homes. Our flush casement windows capture the essence of historic joinery whilst delivering the window benefits modern living demands.

These windows showcase Timberweld corners at their finest, with clean joints that replicate traditional aesthetics.

Other authentic features beyond Timberweld

Timberweld technology is just one element of Timberlook’s heritage charm. Our windows include several features that replicate the charm of wooden versions:

Concealed trickle vents

Modern building regulations require ventilation, but visible vents can compromise heritage appearance. Timberlook windows feature concealed trickle vents that maintain the clean lines of traditional wood frames.

Woodgrain finishes

Select from our collection of shades and genuine woodgrain finishes such as Irish Oak, Golden Oak, and Rosewood, or choose modern tones like Anthracite and Cream. Our two-tone selections enable contrasting interior and exterior colours – ideal for creating light, contemporary indoor spaces while preserving heritage external appearance.

Astragal bars and transom weather bars

Glazing bar arrangements can replicate particular historical eras, from Georgian balanced grids to Victorian ornamental styles

Heritage hardware

Our selection of era-appropriate fittings (including Monkeytail and Peardrop handles) in multiple finishes add to that heritage charm.

Do all Timberlook products use Timberweld?

Timberweld technology is used in Timberlook’s range of uPVC windows, including flush casement and heritage flush sash styles. Timberlook doors do not use Timberweld technology but maintain authentic timber aesthetics through other design features, like a mechanical midrail section, flush fit and woodgrain finishes.

Transform your home with authentic heritage windows: contact us today

Whether you’re updating a property in a conservation area, or simply want the traditional preferences of period aesthetics in a modern home, Timberlook delivers exceptional quality backed by Timberweld technology.

Our windows prove you don’t need to choose between heritage charm and modern performance.  Contact Timberlook today to learn more about our wood-effect windows or find a Timberlook local installer in your area.

Call us on 01253 888 222 or complete our online contact form to start.