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Although the concept of U-value (or U-factor) is universal, U-values can be expressed in different units. In most countries, U-value is expressed in SI units, as watts per square metre-kelvin: W/(m 2 ⋅K) In the United States, U-value is expressed as British thermal units (Btu) per hour-square feet-degrees Fahrenheit: Btu/(h⋅ft 2 ⋅°F)
The U-value is used to refer to the amount of heat that can pass through a window, called thermal transmittance, with a lower score being better. [1] The U-factor of a window can often be found on the rating label of the window. Although the concept of U-value (or U-factor) is universal, U-values can be expressed in different units.
Architects and engineers call the resulting values either the U-Value or the R-Value of a construction assembly like a wall. Each type of value (R or U) are related as the inverse of each other such that R-Value = 1/U-Value and both are more fully understood through the concept of an overall heat transfer coefficient described in lower section ...
In the 1995 Building Regulations, insulation standards were cut to the following U-values: 0.45 for exposed walls, floors and ground floors; 0.6 for semi-exposed walls and floors; 0.25 for roofs; the limit on window area was raised to 22.5%; The 2002 regulations reduced the U-values, and made additional elements of the building fabric subject ...
Kingspan Group plc is a building materials company based in Ireland, trading in over 80 countries with more than 210 factories employing over 22,000 people. The company operates with six divisions; Insulated Panels, Insulation, Light & Air, Water & Energy, and, Data & Flooring, Roof & Waterproofing.
The construction industry makes use of measures such as the R-value (resistance) and the U-value (transmittance or conductance). Although related to the thermal conductivity of a material used in an insulation product or assembly, R- and U-values are measured per unit area, and depend on the specified thickness of the product or assembly. [note 2]
Typical R-values are given for various materials and structures as approximations based on the average of available figures and are sorted by lowest value. R-value at 1 m gives R-values normalised to a 1 metre (3 ft 3 in) thickness and sorts by median value of the range.
With quadruple glazing, the center-of-panel U-value (U g) of 0.33 W/(m 2 K) [R-value 17] is readily achievable. [5] With six-pane glazing, a U g value as low as 0.24 W/(m 2 K) [R-value 24] was reported. [1] This brings several advantages, such as: Energy efficient buildings without modulated sun shading