ASTM D8257/D8257M-22

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

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.

General Information

• Status: Published
• Publication Date: 31-Jan-2022
• ICS: 91.060.20 - Roofs
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: D08 - Roofing and Waterproofing
• Drafting Committee: D08.02 - Steep Roofing Products and Assemblies

Relations

• Refers: ASTM D1204-14(2020) - Standard Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting or Film at Elevated Temperature
• Effective Date: 01-Apr-2020
• Refers: ASTM D1079-20 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-May-2020

Standards Content (Sample)

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.
Designation:D8257/D8257M −22
Standard Specification for
Mechanically Attached Polymeric Roof Underlayment Used
1
in Steep Slope Roofing
This standard is issued under the fixed designation D8257/D8257M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Shingles Used in Roofing and Waterproofing
D751 Test Methods for Coated Fabrics
1.1 This specification addresses mechanically attached
D1079 Terminology Relating to Roofing and Waterproofing
polymeric roof underlayment used in steep slope roofing.
D1204 Test Method for Linear Dimensional Changes of
1.2 The objective of this specification is to provide a
Nonrigid Thermoplastic Sheeting or Film at Elevated
finished product that will be used as a water-shedding under-
Temperature
layment layer on steep sloped roofs prior to and after installa-
D4533/D4533M Test Method for Trapezoid Tearing
tion of the primary roof covering.
Strength of Geotextiles
1.3 The values stated in either SI units or inch-pound units D4798/D4798M Practice for Accelerated Weathering Test
Conditions and Procedures for Bituminous Materials
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each (Xenon-Arc Method)
D4869/D4869M Specification for Asphalt-Saturated Or-
system shall be used independently of the other. Combining
values from the two systems may result in nonconformance ganic Felt Underlayment Used in Steep Slope Roofing
D5035 Test Method for Breaking Force and Elongation of
with the standard.
Textile Fabrics (Strip Method)
1.4 This standard does not purport to address all of the
E96/E96M Test Methods for Gravimetric Determination of
safety concerns, if any, associated with its use. It is the
Water Vapor Transmission Rate of Materials
responsibility of the user of this standard to establish appro-
F1667 Specification for Driven Fasteners: Nails, Spikes, and
priate safety, health, and environmental practices and deter-
Staples
mine the applicability of regulatory limitations prior to use.
G113 Terminology Relating to Natural andArtificial Weath-
1.5 This international standard was developed in accor-
ering Tests of Nonmetallic Materials
dance with internationally recognized principles on standard-
G151 Practice for Exposing Nonmetallic Materials inAccel-
ization established in the Decision on Principles for the
erated Test Devices that Use Laboratory Light Sources
Development of International Standards, Guides and Recom-
G155 Practice for Operating XenonArc LampApparatus for
mendations issued by the World Trade Organization Technical
Exposure of Materials
Barriers to Trade (TBT) Committee.
3. Terminology
2. Referenced Documents
2
3.1 Definitions—For definitions of terms used in this
2.1 ASTM Standards:
specification, refer to Terminologies D1079 and G113.
D146/D146M Test Methods for Sampling and Testing
Bitumen-Saturated Felts and Woven Fabrics for Roofing
3.2 Definitions of Terms Specific to This Standard:
and Waterproofing
3.2.1 polymeric roof underlayment—a sheet material pri-
D228/D228M Test Methods for Sampling, Testing, and
marily composed of one or more synthetic polymers for use as
Analysis of Asphalt Roll Roofing, Cap Sheets, and a secondary water-shedding layer on steep sloped roofs when
installed below the primary roof covering.
3.2.1.1 Discussion—Examples include polyethylene,
1
This specification is under the jurisdiction of ASTM Committee D08 on
polypropylene, or polyethylene terephthalate.
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.02
on Steep Roofing Products and Assemblies.
Current edition approved Feb. 1, 2022. Published February 2022. Originally 4. Workmanship, Finish, and Appearance
approved in 2020. Last previous edition approved in 2020 as D8257/D8257M – 20.
4.1 The polymeric roof underlayment shall be supplied in
DOI: 10.1520/D8257_D8257M-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or roll form.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.2 The polymeric roof underlayment shall be uniform in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. thickness and appearance. It shall be free of visible defects
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D8257/D8257M−22
suchasholes,raggedo
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D8257/D8257M − 20 D8257/D8257M − 22
Standard Specification for
Mechanically Attached Polymeric Roof Underlayment Used
1
in Steep Slope Roofing
This standard is issued under the fixed designation D8257/D8257M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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
2
2.1 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
D4533/D4533M Test Method for Trapezoid Tearing Strength of Geotextiles
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
1
This specification is under the jurisdiction of ASTM Committee D08 on Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.02 on Steep
Roofing Products and Assemblies.
Current edition approved Dec. 15, 2020Feb. 1, 2022. Published December 2020February 2022. Originally approved in 2020. Last previous edition approved in 2020 as
D8257/D8257M – 20. DOI: 10.1520/D8257_D8257M-20.10.1520/D8257_D8257M-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D8257/D8257M − 22
D5035 Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
E96/E96M Test Methods for Gravimetric Determination of Water Vapor Transmission Rate 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 Lamp Apparatus for Exposure of Materials
3. Terminology
3.1 Definitions—For definitions of terms used in this specification, refer to Terminologies D1079 and G113.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 polymeric roof underlayment—a sheet material primarily composed of one or more synthetic polymers for use as a secondary
water-shedding layer on steep sloped roofs when installed below the primary roof covering.
3.2.1.1 Discussion—
Examples include polyethylene, polypropylene, or polyethylene terephthalate.
4. Workmanship, Finish, and Appearance
4.1 The polymeric roof under
...