ASTM WK25210

    New Practice for Determination of Thermal Resistance of Loose-Fill Insulation for Sidewall Applications

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    Developed by Subcommittee: C16.30 | Committee C16 | Contact Staff Manager


    1. Scope

    1. Scope 1.1 This practice presents a laboratory procedure to determine the thermal resistance of loose-fill insulation in side wall applications at mean temperatures between -10 and 55C. 1.2 This practice applies to a wide variety of loose-fill insulation products including fibrous glass, rock/slag wool, or cellulosic fiber materials; granular types including vermiculite and perlite; palletized products; and any other insulation material installed pneumatically into side wall cavities with or without netting. It dies not apply to products that change their character after installation, nor does it consider the effects of structures, containments, facings, films or air films. 1.3 Since this practice is designed for reproducible product comparison, it measures the thermal resistance of an insulation which has been preconditioned to a relatively dry state. Consideration of changes of thermal performance of a hygroscopic insulation by sorption of water is beyond the scope of this practice. 1.4 Insulations which rely on adhesives or other bonding materials to retain the insulation in the wall cavity requires additional conditioning times and should be dried to a constant weight prior to thermal testing in accordance with the material Specifications C 549, C 665, C 739, and C 764. 1.6 This practice may be used to characterize material behavior under controlled steady-state laboratory conditions intended to simulate actual temperature conditions of use. The practice does not simulate forced air flow conditions. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 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.

    No standard protocal exists to prepare specimens for thermal testing for materials intended for sidewall applications. Compressing materials to simulate actual wall densities results in fiber orientations that are not representative of actual installed materials. The uneducated user of practice C687 can overstate the actual thermal performance of materials.


    insulation; loose-fill; thermal resistance; side-wall;

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Patrick Noonan

    Draft Under Development