Modern double or triple glazing uses a ‘Low-emissivity’ or ‘Low E’ glass coating, warm-edge (non-metal) spacer bars, Argon or even Krypton gas between the glass.
Any craft made with jalousie window panes windows#
If you have old double glazed windows and doors before 2006 it is likely these have metal spacer bars around the sealed unit and just air space in between. Glass units today differ substantially from early generation double glazing. What is the minimum U-Value and Window Energy Rating for Windows?Īll new or replacement aluminium, PVCu or timber windows require a minimum C Window Energy Rating or a U-Value of 1.6Wm2K or less. It is important to understand these are calculations that, in a real-world situation, could be better or worse than the stated performance figures. In simple terms, the calculation uses a notional figure on the energy balance of a typical UK house in a year using a variety of window styles and configurations. How are U-Values and Window Energy Ratings Calculated?Ī mathematical formula is used to calculate the U-Value and Window Energy Rating (WER). Some window performance figures are expressed with a U-Value and others with a Window Energy Rating, although the latter has been adopted as the more commonly used. Window Energy Ratings provide a simplified method of understanding the energy saving properties of a window. Typical U-Values on windows and window energy ratings are similar to the familiar energy labels you see on home appliances, rated from A (the lowest), up to G, the highest or worst performing. U-Values are measure in Watts per square metre Kelvin, or W/m2 K. In simple terms, the lower the U-Value number, the better the thermal performance of the window. U-Values indicate the overall performance in retaining heat and preventing it from escaping to the outside. The typical U-Values on windows is a measurement of heat loss and the rate at which it is lost. What are U-Values and what are Window Energy Ratings?
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