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A radiant barrier reduces the radiant heat transfer from the underside of the roof to the other surfaces in the attic. Some studies show that radiant barriers can reduce cooling costs 5% to 10% when used in a warm, sunny climate. The reduced heat gain may even allow for a smaller air conditioning system.
Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value (in K⋅m 2 /W) is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]
Radiant barriers will reflect radiant energy. A radiant barrier by itself will not affect heat conducted through the material by direct contact or heat transferred by moist air rising or convection. For this reason, trying to associate R-values with radiant barriers is difficult and inappropriate. The R-value test measures heat transfer through ...
It acts as additional radiative (radiant barrier) and convective insulation and provides a condensation barrier. [ 1 ] In New Zealand, both corrugated metal and asbestos-cement shingle roofs were fitted directly over wooden sarking boards in the historical "bungalow" style of house construction.
In his 3m cubed test room with a 1 x 0.5 m radiator and walls of average U value 0.44 W/m 2 K, he found that for a radiator temperature of 43 °C the heat flux through the wall behind the radiator reduced from 7.1 to 3.1 W/m 2. Note that the average heat loss in the room was not reduced by such a large percentage as only part of the surface of ...
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