ASTM C1373 / C1373M - 11

    Standard Practice for Determination of Thermal Resistance of Attic Insulation Systems Under Simulated Winter Conditions

    Active Standard ASTM C1373 / C1373M | Developed by Subcommittee: C16.30

    Book of Standards Volume: 04.06


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    1. Scope

    1.1 This practice presents a laboratory procedure to determine the thermal resistance of attic insulation systems under simulated steady-state winter conditions. The practice applies only to attic insulation systems that face an open attic air space.

    1.2 The thermal resistance of the insulation is inferred from calculations based on measurements on a ceiling system consisting of components consistent with the system being studied. For example, such a system might consist of a gypsum board or plywood ceiling, wood ceiling joists, and attic insulation with its top exposed to an open air space. The temperature applied to the gypsum board or plywood shall be in the range of 18 to 24°C (64 to 75°F). The air temperature above the insulation shall correspond to winter conditions and may range from -46°C to 10°C (-51 to 50°F). The gypsum board or plywood ceiling shall be sealed to prevent direct airflow between the warm and cold sides of the system.

    1.3 This practice applies to a wide variety of loose-fill or blanket thermal insulation products including fibrous glass, rock/slag wool, or cellulosic fiber materials; granular types including vermiculite and perlite; pelletized products; and any other insulation material that may be installed pneumatically or poured in place. The practice considers the effects on heat transfer of structures, specifically the ceiling joists, substrate, for example, gypsum board, air films, and possible facings, films, or other materials that may be used in conjunction with the insulation.

    1.4 This practice measures the thermal resistance of the attic/ceiling system in which the insulation material has been preconditioned according to the material Specifications C 549, C 665, C 739, and C 764.

    1.5 The specimen preparation techniques outlined in this standard do not cover the characterization of loose-fill materials intended for enclosed applications.

    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 All values shall be reported in both SI and inch-pound units unless specified otherwise by the client.

    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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C167 Test Methods for Thickness and Density of Blanket or Batt Thermal Insulations

    C168 Terminology Relating to Thermal Insulation

    C177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus

    C518 Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus

    C520 Test Methods for Density of Granular Loose Fill Insulations

    C549 Specification for Perlite Loose Fill Insulation

    C665 Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing

    C687 Practice for Determination of Thermal Resistance of Loose-Fill Building Insulation

    C739 Specification for Cellulosic Fiber Loose-Fill Thermal Insulation

    C764 Specification for Mineral Fiber Loose-Fill Thermal Insulation

    C1045 Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions

    C1058 Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation

    C1114 Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus

    C1363 Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus


    ICS Code

    ICS Number Code 91.120.10 (Thermal insulation of buildings)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/C1373_C1373M-11

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