Double Glazed Aluminium Sliding Folding Windows Thermal Insulated For Roof

Examining the thermal insulation of a window or door:

The type of a window or door affects the level of its thermal insulation. Thus, as mentioned above, hinged windows typically offer higher thermal insulation than sliding windows, as their design allows for higher sealing thanks to the insulating gaskets placed around the window leaf and the frame. For the same reason, i.e. the tightness level, a double leaf sliding window in which one leaf is sliding and the other fixed, offers greater thermal insulation than a corresponding one in which both leaves are sliding. However, in order to be sure that the window we choose has a high level of thermal insulation, we should consider two key indicators: the Uf -value and the Uw-value.

The Uf indicates the thermal insulation level of the window without the glass panel, so it measures only the thermal loss of the frame and the leaf. Through the Uf we can directly compare two different frames and make useful conclusions about the level of the thermal insulation they offer. Though, in order to come to a final conclusion, we should check the Uw-value, which measures the thermal losses of a window as a whole, including the glass panel. Considering the fact that glass represents usually 70% -80% of the total surface of a window, it is obvious that the Uw indicator is crucial regarding the thermal insulation of a window.

For example, a simple non-insulated aluminium window with an energy efficient glass, can have a thermal insulation level similar to another more expensive thermally insulated aluminium window which does not include an energy efficient glass panel. So, we have to pay attention on both indicators, but give more emphasis on the Uw which is in fact the final thermal insulation of the window. Note that in entrance doors the corresponding indicator is called Ud and measures the level of thermal insulation of the door combined with the applied panel.

Last but not least, the Ug indicator determines the thermal insulation of the glass panel alone. In particular, the Uf-value combined with the Ug-value lead us to the final Uw-value (for windows/ balcony doors) or Ud-value (for entance doors).

It is important to remember that all of the above indicators measure thermal losses, which is why they are also called thermal transmittance indicators. The lower the thermal loss, the greater the thermal insulation of the tested windows or doors. Therefore, the lower the value of Uf, Ug, Uw and Ud, the higher energy efficiency will your windows and doors have. For example, a sliding door with Uw =1,6 W/m2K will offer higher thermal insulation than a sliding door with Uw =1,9 W/m2K. Finally, we should stress that Uw and Ud should always be calculated and compared for specific frame dimensions.

Introduction of Sliding Windows:

Sliding windows and doors are a very good option in case you need to cover spans which have a width larger than 1.70 m. Moreover, sliding windows are the ideal option when you have limited space around your window. Also, for large spans you can use a technologically superior lift & slide system that is much easier to slide and provides an excellent tightness against air and water, thanks to the special lift mechanism that raises the sash, allowing its rollers to glide smoothly on the rail of the frame. Modern sliding windows and doors have come a long way and provide reliable solutions, with excellent functionality.
ALUMIL offers a wide variety of sliding or lift & slide windows and doors: Round Sliding Windows
Horizontal sliding windows – In which multiple sliding windows stand next to each other on separate sliding tracks.
Meeting stile windows – In which two sliding windows stand on the same sliding track and are locked at their connection point in the middle.
Pocket windows – Usually, one or two sliding windows which when opened are hidden into to the wall.Round Sliding Windows
Corner windows – Constructions in which two sliding windows make a right angle (90o) and are locked at their connection point in the corner.

Glass Specification:

Single-Pane Glass: Simple and Cost Efficient
Due to lower costs, single-pane windows are great for garages, tool-sheds, and other non-heated outbuildings. Also, when single-pane windows get broken, they are less expensive to repair as you only need one pane of glass. If energy efficiency is a concern, dual- or triple-pane glass options are a wiser choice.

Dual-Pane Glass: The New Standard
Double glazing consists of two glass panes which are joined together usually through an aluminium spacer or a warm-edge spacer (polyamide profile) and sealed around with a special glue. They offer significantly higher thermal insulation and sound insulation compared to single glazing in which only one glass pane is applied.

Double-Pane Energy Efficient Glass: Save energy & money thanks to the use of energy efficient double glazing.
Energy efficient double glazing, also known as low-emissivity glazing, is structured like conventional double-glazing, but has special glasses offering higher thermal insulation thanks to the insulation gas which is filled in between the two glass panes.
Specifically, it is composed of two glass panes which are joined together usually through an aluminium spacer or a warm-edge spacer (profile) and sealed around with a special glue. The first glass pane is a clear float glass, whilst the second one is specially processed by applying a low-emissivity layer (low-E Glass), which ensures high reflection of the sun’s infrared radiation and diminishes in that way infrared radiation transmittance in interior spaces. In addition, as mentioned above, the space between the two glass panes is filled with argon gas for enhanced thermal insulation.
So, through energy efficient double-glazing, lower thermal loses from the interior to the exterior environment of your house are possible. Moreover, the undesired heat during summer is reduced due to reduction of the intense sun radiation, thus ensuring better climatic conditions.

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