ASTM D6757/D6757M-18(2023)

Standard Specification for Underlayment Felt Containing Inorganic Fibers Used in Steep-Slope Roofing

ABSTRACT
This specification covers inorganic fiber-reinforced organic felt, and inorganic fiber-based asphaltic and nonasphaltic felt underlayments for use as underlayment with steep-slope roofing products. The intent of this specification is to provide criteria for producing and evaluating underlayments with a significantly reduced tendency to wrinkle before or after the installation of steep roofing products. Materials shall be sampled and tested suitably to examine their conformance with performance requirements such as tear strength, pliability, behavior on heating, liquid water transmission, dimensional stability at low to high humidity conditions, and elongation.
SCOPE
1.1 This specification covers (1) inorganic fiber-reinforced organic felt underlayment, and (2) inorganic fiber-based felt for use as underlayment with steep-slope roofing products. The intent of this specification is to provide criteria for producing and evaluating underlayments with a significantly reduced tendency to wrinkle before or after the installation of steep roofing products.  
1.2 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.  
1.3 The following safety hazards caveat pertains only to the test method portion, Section 8, of this specification: 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 requirements prior to use.  
1.4 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: 30-Jun-2023
• ICS: 91.060.20 - Roofs
• Technical Committee: D08 - Roofing and Waterproofing
• Drafting Committee: D08.02 - Steep Roofing Products and Assemblies

Relations

• Refers: ASTM D1079-20 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-May-2020
• Refers: ASTM D228/D228M-19 - Standard Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
• Effective Date: 01-May-2019
• Refers: ASTM D1079-18e1 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 15-Dec-2018
• Refers: ASTM D1079-18 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 15-Dec-2018
• Refers: ASTM D228/D228M-18 - Standard Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
• Effective Date: 01-Nov-2018
• Refers: ASTM D228/D228M-16 - Standard Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
• Effective Date: 01-Nov-2016
• Refers: ASTM D1079-16 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-Feb-2016
• Refers: ASTM D4869/D4869M-16 - Standard Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing
• Effective Date: 01-Jan-2016
• Refers: ASTM D228/D228M-15 - Standard Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
• Effective Date: 01-May-2015
• Refers: ASTM D4869/D4869M-15 - Standard Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing
• Effective Date: 01-Jan-2015
• Refers: ASTM D228/D228M-09(2014) - Standard Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
• Effective Date: 01-May-2014
• Refers: ASTM D1079-13e1 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-Mar-2013
• Refers: ASTM D1079-13 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-Mar-2013
• Refers: ASTM D4869/D4869M-05(2011)e1 - Standard Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing
• Effective Date: 01-Jul-2011
• Refers: ASTM D1079-10 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-Sep-2010

Overview

ASTM D6757/D6757M-18(2023) is the internationally recognized standard specification developed by ASTM International for underlayment felts containing inorganic fibers used in steep-slope roofing applications. This standard covers both inorganic fiber-reinforced organic felts and inorganic fiber-based felts, including asphaltic and nonasphaltic types, ensuring optimal performance as underlayments for steep-slope roofing products. The primary purpose of this specification is to provide rigorous criteria for the manufacture and evaluation of underlayments that exhibit a significantly reduced tendency to wrinkle before or after the installation of roofing materials. Compliance with ASTM D6757/D6757M aids manufacturers, roofing contractors, and inspectors in ensuring that roofing underlayments meet essential quality requirements for tear strength, dimensional stability, moisture resistance, and overall durability.

Key Topics

• Material Types Covered

  • Inorganic fiber-reinforced organic felt underlayments
  • Inorganic fiber-based asphaltic and nonasphaltic felt underlayments

• Performance Properties Evaluated

  • Tear strength
  • Pliability at various temperatures
  • Dimensional stability under different humidity conditions
  • Resistance to liquid water transmission
  • Behavior under heating (thermal stability)
  • External defects such as cracks, tears, or bulges

• Testing and Sampling

  • Methods reference key ASTM standards: D146, D228, D4869, and F1087
  • Procedures for assessing physical and mechanical properties
  • Evaluation of dimensional changes from low to high humidity

• Packaging and Marking

  • Clear labeling of supplier, product brand, and ASTM designation
  • Secure wrapping to prevent unrolling or slippage during transport
  • Specification limits on the number of splices per roll and marking requirements for spliced materials

Applications

ASTM D6757/D6757M-18(2023) is crucial for the roofing and construction industries, particularly in projects involving steep-slope roofs where high-performance underlayment is required to prevent moisture intrusion and ensure long-term roof system durability. Key applications include:

• Residential and Commercial Roofing

  • As a protective layer beneath shingles, tiles, or metal roofing systems on steep slopes

• New Construction and Re-roofing

  • Ensuring underlayments remain stable during and after installation, reducing risks related to wrinkling or movement

• Moisture and Weather Protection

  • Providing a secondary barrier against liquid water transmission, enhancing the roof's resistance to severe weather

• Quality Assurance in Manufacturing and Procurement

  • Assisting manufacturers and suppliers in standardizing product quality
  • Offering a reliable basis for inspection, acceptance, and potential rejection of underlayment materials

Related Standards

For comprehensive quality assurance in roofing applications, ASTM D6757/D6757M cross-references several related ASTM standards, including:

• ASTM D146: Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Waterproofing
• ASTM D228: Test Methods for Sampling, Testing, and Analysis of Asphalt Roll Roofing, Cap Sheets, and Shingles Used in Roofing and Waterproofing
• ASTM D4869: Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing
• ASTM D1079: Terminology Relating to Roofing and Waterproofing
• ASTM F1087: Test Method for Linear Dimensional Stability of a Gasket Material to Moisture

These standards collectively ensure that steep-slope roofing underlayments meet rigorous industry and safety requirements, promoting durability, weather resistance, and long-term performance in constructed facilities.

Keywords: ASTM D6757, steep-slope roofing, underlayment felt, inorganic fibers, roofing standards, roofing underlayment, dimensional stability, water resistance, tear strength, construction materials.

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: D6757/D6757M − 18 (Reapproved 2023)
Standard Specification for
Underlayment Felt Containing Inorganic Fibers Used in
Steep-Slope Roofing
This standard is issued under the fixed designation D6757/D6757M; 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 D228/D228M Test Methods for Sampling, Testing, and
Analysis of Asphalt Roll Roofing, Cap Sheets, and
1.1 This specification covers (1) inorganic fiber-reinforced
Shingles Used in Roofing and Waterproofing
organic felt underlayment, and (2) inorganic fiber-based felt for
D1079 Terminology Relating to Roofing and Waterproofing
use as underlayment with steep-slope roofing products. The
D4869/D4869M Specification for Asphalt-Saturated Or-
intent of this specification is to provide criteria for producing
ganic Felt Underlayment Used in Steep Slope Roofing
and evaluating underlayments with a significantly reduced
F1087 Test Method for Linear Dimensional Stability of a
tendency to wrinkle before or after the installation of steep
Gasket Material to Moisture
roofing products.
1.2 The values stated in either SI units or inch-pound units
3. Terminology
are to be regarded separately as standard. The values stated in
3.1 Definitions—For definitions of terms used in this
each system may not be exact equivalents; therefore, each
specification, refer to Terminology D1079.
system shall be used independently of the other. Combining
values from the two systems may result in nonconformance
4. Classification
with the standard.
4.1 Organic felts that are reinforced with inorganic fibers are
1.3 The following safety hazards caveat pertains only to the
covered by this specification.
test method portion, Section 8, of this specification: This
4.2 Inorganic fiber-based asphaltic and nonasphaltic felts
standard does not purport to address all of the safety concerns,
are covered by this specification.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety, health, and
5. Materials and Manufacture
environmental practices and determine the applicability of
5.1 In the process of manufacture, a single thickness of
regulatory requirements prior to use.
inorganic mat or organic felt that is reinforced with inorganic
1.4 This international standard was developed in accor-
fibers shall be uniformly saturated or coated.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6. Physical Requirements
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
6.1 The material shall conform to the physical requirements
Barriers to Trade (TBT) Committee.
prescribed in Table 1.
6.2 The finished product shall not crack nor be so sticky as
2. Referenced Documents
to cause tearing or other damage upon being unrolled at
2.1 ASTM Standards:
temperatures between –1 and 60 °C [30 and 140 °F]. The
D146/D146M Test Methods for Sampling and Testing
finished product shall pass the water shower exposure test in
Bitumen-Saturated Felts and Woven Fabrics for Roofing
accordance with 8.1.4, indicating resistance to liquid water
and Waterproofing
transmission.
This specification is under the jurisdiction of ASTM Committee D08 on
7. Dimensions, Masses, Workmanship, Finish, and
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.02
Appearance
on Steep Roofing Products and Assemblies.
Current edition approved July 1, 2023. Published July 2023. Originally approved
7.1 Dimensions and masses to be agreed upon between
in 2002. Last previous edition approved in 2018 as D6757/D6757M – 18. DOI:
buyer and seller.
10.1520/D6757_D6757M-18R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.2 The finished material shall be free of visible external
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
defects, such as holes, ragged or untrue edges, breaks, cracks,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tears, bulges, and indentations.
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D6757/D6757M − 18 (2023)
TABLE 1 Physical Requirements
8.2.3.1 Low humidity to high humidity:
Tear strength, min at 23 ± 2 °C, 4.0, [0.88] (in any
L
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