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    ASTM D8257 / D8257M - 20

    Standard Specification for Mechanically Attached Polymeric Roof Underlayment Used in Steep Slope Roofing

    Active Standard ASTM D8257 / D8257M | Developed by Subcommittee: D08.02

    Book of Standards Volume: 04.04


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    1. Scope

    1.1 This specification addresses mechanically attached polymeric roof underlayment used in steep slope roofing.

    1.2 The objective of this specification is to provide a finished product that will be used as a water-shedding underlayment layer on steep sloped roofs prior to and after installation of the primary roof covering.

    1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

    1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    D146/D146M Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Waterproofing

    D228/D228M Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing

    D751 Test Methods for Coated Fabrics

    D1079 Terminology Relating to Roofing and Waterproofing

    D1204 Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting or Film at Elevated Temperature

    D4798/D4798M Practice for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)

    D4869/D4869M Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing

    D5035 Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)

    E96/E96M Test Methods for Water Vapor Transmission of Materials

    F1667 Specification for Driven Fasteners: Nails, Spikes, and Staples

    G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials

    G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

    G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials


    Referencing This Standard
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    DOI: 10.1520/D8257_D8257M-20

    Citation Format

    ASTM D8257 / D8257M-20, Standard Specification for Mechanically Attached Polymeric Roof Underlayment Used in Steep Slope Roofing, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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