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The glazing bead is the aluminium profile that secures the sealed units (or glass) into the aluminium window frame or opening vent. When inserting glass into a window system (often referred to as Glazing the window) the glazing bead and wedge gaskets are the last pieces of the window that you fix into place. Some windows are externally glazed (also known as “externally beaded”), while some are internally glazed (also known as “internally beaded”). Some window systems will use a mix of internally glazed and internally glazed sections within a single window.
There have been many arguments over the years as to whether internally glazed or externally glazed windows are better for security. With people using arguments such as: “If you glazed a window from the outside then you can de-glaze it from the outside. Therefore externally beaded windows cannot possibly be secure.” Along with counter arguments such as “Internally beaded PVC windows can simply have their glass units forced in”.
The majority of people in the industry once considered externally glazed windows to be less secure. This is simply due to the fact that internally glazed windows were developed, introduced and advertised as the more secure option. This is no longer the case due to the fact that the majority of externally glazed windows use modern technology, which means that the external glazing beads simply cannot be removed without removing the internal wedge gasket first.
The simple fact is that both internally beaded and externally beaded aluminium windows are secure and the industry standard tests are there to prove it. Therefore if a window system can pass these tests they are deemed to be secure. If a window can pass the British Standard 7950 and also the Police Preferred Secured by Design Standard, it is considered to be highly secure. So in the absence of any other even more stringent tests and standards, which should you choose, Internal or external glazed?
Key Points About Internally Beaded Windows:
Key Points About Externally Beaded Windows:
Both external and internal beads on a single window:
Often you will find that a window system will mix internal and external beads on a single window. This is generally due to the fixed lites being externally glazed. Windows that do not open (otherwise known as fixed lites) are generally glazed from the outside directly into the window frame. Therefore, a window which is made up of an opening sash next to a fixed pane - would be internally beaded on the opening vents and externally beaded on the fixed pane. This gives the best looks and slimmest sight-lines. If you wish to have internally glazed through-out your windows you would normally have to opt for dummy sashes or a double beaded window frame. Dummy sashes provide equal sight-lines, as all the fixed lites are created by fixing opening vents into the outerframe, and are internally glazed.
This information was taken from the Duration Windows Blog. Scources include, aluminiumtradesupply.co.uk and double-glazing-forum.com.
Our Premium aluminium windows offer high performance, security and slim-lines. They are very thermally efficient windows, with many styles and designs to suit any home.
These windows are now even better with most frame and vent combinations being A Rated, and are at a much reduced cost. Visit us and see for yourself.
Friction hinges provide added security over traditional hinges and allow the window to be held open in any given position. They also move across the window to allow for easy cleaning of your windows from inside.
Our windows can be fitted with modern industry standard friction hinges, egress friction hinges for fire escape windows, or restrictor friction hinges for safety.
Our products are all painted with a hardwearing polyester powdercoat paint, the paint is built to last and baked onto the aluminium.
Our Premium aluminium windows are available in a standard white, black, brown, dark grey, dove grey and cream. You can also have you window painted in dual colour or any of over 200 single or dual RAL colour finishes.
Using the natural strength of aluminium these windows are made to be nice and slim. As a result this window system provides more glass area and less frame, maximising light and solar gain into the property.
This window system can achieve sight-lines on fixed lites of 43mm and sight-lines on openers of 65mm.
These windows come with a high security multi-point Trojan shootbolt lock, which also helps provide excellent compression.
They are largely stainless steel in construction for strength & ultimate corrosion resistance. The lock consists of multiple espag locks with shootbolts top & bottom, providing increased security & tested to the equivalent of PAS 24 (BS 7950) for enhanced security.
These windows are available with a variety of different outerframes, including a standard direct fix, ovolo, odd leg, equal leg and a square direct fix frame and provide a variety of options for different applications.
This versatility means that this window system can be fitted into existing or new timber frames, or directly to the brick work.
For your windows you can have either double glazed or triple glazed sealed units and choose between a wide range of different glass designs & glass options. You can have standard clear glass, square / diamond leads, georgian grills, astragal bars, patterned / decorative glass, obscure or textured glass.
Other options include self cleaning glass, solar control glass and laminated safety glass.
There is a selection of handles available for your windows, which are available in a variety of colours. With modern and period handles, to suit traditional or contemporary properties.
These options include industry standard espag handles, basic cockspur handles and our Chelton handle range. The Chelton handle range consists of a modern Slim-line, an Art Deco and a classic Monkey Tail handle.
These windows use some of the latest technology, such as an extra wide in-line plyamide thermal break & argon gas, to achieve window energy ratings (WER) as high as ‘A’ and U-values as low as 1.3 W/M²K.
Our standard double glazed sealed unit for these windows is Planitherm Total+, with a warm edge spacerbar & centre pane U-value of 1.2 W/M²K, they exceed the Building Regs.
These exceptional windows provide the very best in performance:
|Overall U-Value:||1.6 W/M²K|
|Air Permeability:||600 Pa|
|Water Tightness:||600 Pa|
|Wind Resistance:||2400 Pa|
There are a variety of internal and externally beaded vents, which can be top hung, side hung or even bottom hung. They provide a variety of attractive style window options, to achieve contemporary or period appearances, so there is something to suit any home.
This includes a modern flat vent, a chamfered vent, a feature vent and a classic steel window style stepped vent.
Based on our popular Smarts 47 Casement Window comes the ground breaking Aluminium Flush Casement Window. A marriage of traditional aesthetics and the modern properties & benefits of an engineered aluminium design. Overall, a stunning clean finish which is minimalist and fuss free.Read More...
If you require modern features but not in a wooden finish then our latest addition is the window for you. Based on traditional design these windows will create a stunning feature on any home. Available in over 200 plus RAL colours and with excellent thermal properties these windows are available now. Contact us for details.