1.1 This test method establishes a method to determine the effect that air-permeable fibrous thermal insulation in a space has on the flow rate of air through that space. 1.2 This test method describes an apparatus to determine the volumetric air flow rate through fibrous insulation material only. 1.3 This test method provides comparative values of volumetric air flow rates of different air permeable fibrous materials installed at varying densities. 1.4 This test method is applicable to measuring the rate of volumetric air flow rates over a range of conditions. 1.5 Units--The values stated in SI units are to be regarded as the standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
It is estimated that some one hundred million homes could benefit from some amount of weatherization retrofit. Many weatherization agencies and certification bodies have developed various protocols for this work and much of it has focused on air sealing the structure. These same organizations have made recommendations as to the installation of a dense packed fibrous thermal insulation material to both reduce air flow and insulate the exterior shell. While R-value test methods and air barrier assembly tests have existed for some time, there is no existing test method that will adequately determine the reduction of air flow as a direct result of the addition of fibrous insulation in these wall cavities. In an effort to obtain some uniformity, many agencies have taken to using arbitrary density metrics as a minimum standard. This determination does not accurately reflect the capacity of different materials abilities to reduce air flow. There currently are only air barrier material and assembly tests that have been adapted in an attempt to determine the air flow resistance. This test method is for materials not intended to be used as air barriers. As such, there is no definitive information gathered about the actual material. This test method allows for comparative results between material types and densities.
Keywordsair leakage; air retarder; building materials
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Robert De Vries
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