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What is a U-Value?

U Value

A U-value is a sum of the thermal resistances of the layers that make up an entire building element – for example, a roof, wall, or floor. It also includes adjustments for any fixings or air gaps.

A U-value value shows, in units of W/m²K, the ability of an element to transmit heat from a warm space to a cold space in a building, and vice versa. The lower the U-value, the better insulated the building element.

A building element’s U-value is extremely important as there are certain standards that should be reached according to Building Regulations / Standards.

When requesting a U-value for windows or doors, be sure to get the whole windows u value, not just centre pane U-values. The glass on its own will have a better u value than that of the whole window.

U-values in windows and doors are only part of the story, energy ratings are also an important consideration.

For example, as a minimum you want to ask for an energy efficient A rated window with 1.4 U-value.

Our team are experts when it comes to choosing double-glazed windows for your property that meet your specific energy efficiency requirements. Please call Boyland Windows on 01202 499499 to discuss your window choices and energy performances with one of our experienced surveyors and book an appointment today.

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