What Is a U-Value? (Thermal Transmittance Explained)
A U-Value measures the rate of heat transfer through a building element, such as a roof, wall, window, door, or floor. In building physics, it represents the thermal transmittance of a construction assembly and is defined as the inverse of the total thermal resistance (R-value) of all layers within that element.
In simple terms, the U-Value indicates how much heat flows through a material or structure from a warm area to a colder area. It is a key metric used to evaluate the thermal performance and energy efficiency of building components.
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