ASTM D8257/D8257M-20

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: Historical
• Publication Date: 14-Dec-2020
• 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

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D8257/D8257M −20
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 Water Vapor Transmission of
safety concerns, if any, associated with its use. It is the
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 LightApparatus for
mendations issued by the World Trade Organization Technical
Exposure of Non-Metallic Materials
Barriers to Trade (TBT) Committee.
3. Terminology
2. Referenced Documents
3.1 Definitions—For definitions of terms used in this
2
2.1 ASTM Standards:
specification, refer to Terminologies D1079 and G113.
D146/D146M Test Methods for Sampling and Testing
3.2 Definitions of Terms Specific to This Standard:
Bitumen-Saturated Felts and Woven Fabrics for Roofing
3.2.1 polymeric roof underlayment—a sheet material pri-
and Waterproofing
marily composed of polymers for use as a secondary water-
D228/D228M Test Methods for Sampling, Testing, and
shedding layer on steep sloped roofs when installed below the
Analysis of Asphalt Roll Roofing, Cap Sheets, and
primary roof covering.
4. Workmanship, Finish, and Appearance
1
This specification is under the jurisdiction of ASTM Committee D08 on
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.02
4.1 The polymeric roof underlayment shall be supplied in
on Steep Roofing Products and Assemblies.
roll form.
Current edition approved Dec. 15, 2020. Published December 2020. DOI:
10.1520/D8257_D8257M-20.
4.2 The polymeric roof underlayment shall be uniform in
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
thickness and appearance. It shall be free of visible defects
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
suchasholes,raggedoruntrueedges,breaks,cracks,tears,and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. protruding edges of reinforcement.
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D8257/D8257M−20
4.3 The surface of the underlayment sheet shall be designed 7. Test Methods
to provide traction and slip resistance to the applicator.
7.1 Conditioning—Unless otherwise stated, all specimens to
be tested shall be conditioned for a minimum period of 24 h at
NOTE 1—The intent of 4.3 is to recognize that surface
...