The multi-chambered uPVC profiles that make up Liniar frames and sashes have been cleverly designed to trap warm air and prevent it from being transferred through the frame. This stops excessive heat transfer into and out of the building and is what’s meant by ‘thermally efficient.’

That’s why installing Liniar windows can help keep your home warmer in the winter and cooler in the summer, making it more comfortable all year round with less reliance on powered heating and cooling systems. This is what’s meant by ‘energy efficient.’ Reduced energy use results in a smaller carbon footprint, which is what we mean by ‘sustainable.’

These factors combined with Liniar’s emphasis on responsible manufacturing methods (for example, waste reduction and incorporation of recycled materials) are what make Liniar windows thermally efficient, energy efficient, and sustainable.

So how does it work?

Historically, windows were built with rubber gaskets fitted at the fabrication stage. This meant the assembled frame was subject to variations in the quality of each seal joint, often resulting in draughts, wind noise and heat loss.

When the Liniar uPVC window system was designed, a significant amount of time was spent developing its patented ‘bubble gasket.’ The design of this dual-action gasket and the area behind means it outperforms all others in speed of fabrication and in permeability – acting equally well as a soft dynamic seal on opening sashes and a firm glazing gasket for sealed units.

The Liniar bubble gasket achieved zero air leakage during independent testing at the British Standards Institute (BSI) and is co-extruded onto each length of uPVC window profile at Liniar’s state of the art facility in Derbyshire. Co-extrusion means adhering the gasket onto the frame during the uPVC extrusion process, eliminating the time-consuming gasket insertion stage at fabrication and creating a more reliable corner seal in each window frame and sash.

Not all windows are made the same

You may be forgiven for thinking uPVC windows are all the same – however, it’s the little details you don’t see that make the big differences, as they’re hidden away inside the frames.

By choosing Liniar windows, you can rest assured that the advanced technology and design invested in all the products in the system means the highest possible energy efficiency for your home.

Window Energy Ratings are similar to the labels found on household appliances, with A++ being the most energy efficient and E the lowest. The Liniar window system can achieve A++ ratings for double glazed units with ease, compared to other window systems which need more expensive glass or even triple glazing to reach the same results.

You many also hear U-values used to describe thermal efficiency, especially in doors (which don’t have Window Energy Ratings). A U-value is the measure of the heat loss in watts (W) per square metre (m²) of material when the temperature (K) outside is at least 1 degree cooler. You’ll see U-values written as W/m²K – and the lower they are, the better the energy efficiency of the window or door.

Liniar doors, including residential doors, sliding patio doors, bi-folding doors and French doors, have some of the lowest U-values on the market, making them highly thermally efficient.

Liniar’s online WER calculator can be used by fabricators to determine the exact energy rating and U-value of the windows and doors they manufacture, helping the end user to understand the energy performance of their Liniar products.

Building a sustainable future

Many parts of Liniar’s window and door systems are already made with recycled PVCu and the company is investing heavily in new machinery to advance this progress still further. Glazing platforms which help to perfectly seat the glazed units into the frame, window cills and other ancillary products, including reinforcements, are all manufactured from part-recycled materials. This means choosing a Liniar uPVC window can be more sustainable than choosing an alternative system. Windows and doors containing recycled thermal reinforcement not only offer the same strength as those reinforced with steel, they are more easily recycled at the end of their useful life, making them more eco-friendly.