A U value is a measure of heat loss in a building element such as a wall, floor or roof. This means that the higher the U value the worse the thermal performance of the building envelope. A low U value usually indicates high levels of insulation. They are useful as it is a way of predicting the composite behaviour of an entire building element rather than relying on the properties of individual materials.
U values are important because they form the basis of any energy or carbon reduction standard.
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