Everything You Need To Know About Double Glazing

This coating reflects the heat generated inside the home back into the room, rather than allowing it to escape through the window. At the same time, it allows optimum amounts of sunlight to pass through the window. Our Advance glass boasts a neutral appearance and a centre pane U value of 1.1W/2mK. Whilst a G value of 50% still allows for maximum solar heat gain into the property through the glass. Advance comparable thermal benefits to triple vs double glazing glazed sealed units but is much lighter meaning less strain on hinges and moving mechanisms and is a much more cost effective solution also. Secondary glazing enhances thermal insulation, reducing heat loss by up to 70% and improving energy efficiency The amount of heat saved depends on factors like the quality of installation and the type of material used.

Take a trip around our Donington-based factory and find out how we use state of the art robotic machinery, and then finish our products by hand to achieve our high quality standards. If you’d like to learn more about how we manufacture bespoke timber windows and speak to a member of our team, simply submit an enquiry via our contact page, and we’ll be in touch shortly to discuss your project. After agreeing the quote, our surveyor comes to measure precisely so we can manufacture your new double glazing to perfectly fit your home. Todd Doors have been supplying timber doors throughout the UK for over 70 years.
Our glazing styles are available with varying levels of opacity, so you can choose a smart switchable glass design that looks and performs as you need it to. Our high resolution glazing videos allow you to explore our composite door glazing range in crystal clear quality. View each style up close and explore the opacity levels of the Endurance range to ensure you select the perfect glass design for your composite door. Our range of doors is so vast, and this is matched by our array of glass designs for composite doors. That’s why our easy-to-use Door Designer makes it simpler than ever to find your perfect match.

Secondary glazing is the perfect solution, protecting your existing windows, improving their lifespan and saving up to 10% more energy than you would with traditional double glazing. With five separate product types to choose from, plus the ability to have custom-manufactured shapes, there is no limit to the aesthetic capabilities of our secondary glazing. Whatever your style of existing window, there is a secondary glazing solution to match.
It is made to fit your specific windows using a material called plexiglass, which has a guarantee of 30 years. By the 1960s, the UK began producing them for better insulation, addressing the shortcomings of single-pane windows, such as increased condensation. Legislation from 1965 onwards aimed to regulate the industry and promote energy efficient materials, including double glazing. By the 1990s, 60% of UK homes had adopted double glazing, significantly improving home comfort. Companies like Everest advanced the technology, introducing aluminium and uPVC double glazing units in the late 20th century.

It is (sometimes) possible to bisque fire the first glaze before applying the second. It requires another firing, but this way the first glaze is permanently fused in place and cannot crawl. This only works with glazes that have the right amount of melt at whatever bisque temperature you use.

In a double glazed unit, the outside pane of glass and the internal will be different temperatures. The space between the panes (usually 6-12mm) creates an air gap that slows down thermal transfer (hot or cold) by conduction – it doesn't 'trap heat' but it slows down the movement of heat to reduce heat loss. In 1965, in the UK, Everest began life selling a version of aluminium secondary glazing.
In most cases, secondary glazing is considered a "permitted development" and doesn’t require planning permission. However, exceptions may apply, especially in conservation areas replace or repair windows for listed buildings. We recommend checking with your local planning authority for specific guidance.