Full-Thickness Thermal Testing of Fiberglass Insulation Using an ASTM C518-10 Heat Flow Meter Apparatus

TL;DRAbstract

Can thermal conductivity tests be performed at thicknesses greater than that of the primary standard? As a test specimen thickness increases, the edge loss effects can also increase, causing a heat flux through the specimen that may become less one dimensional. New equipment designs in thermal comparators allow for greater guard-to-metered-area ratios, which should reduce this effect and allow for measurements on thicker specimens than before for commercially available equipment. Laboratory testing of roll and batt insulations at a representative thickness of 76 mm has always been considered to be representative of the performance at full thickness. As more stringent building codes call for increasingly higher levels of insulation in homes, verification of material performance, such as loose-fill insulation, requires that it be tested at a representative thickness that is greater than that of the calibration standard. This paper describes a series of tests performed using a series of f

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