ASTM D2626/D2626M-04(2020)

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:D2626/D2626M −04 (Reapproved 2020)
Standard Specification for
Asphalt-Saturated and Coated Organic Felt Base Sheet
Used in Roofing
This standard is issued under the fixed designation D2626/D2626M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope D1079 Terminology Relating to Roofing and Waterproofing
E96/E96M Test Methods for Water Vapor Transmission of
1.1 This specification covers asphalt-saturated and coated
Materials
organic felt base sheet with mineral surfacing on the top side,
with or without perforations, for use as the first ply of a
3. Terminology
built-up roof.When not perforated, this sheet is suitable for use
3.1 Definitions—For definitions of terms used in this
as a vapor retarder, with a solid mopping of asphaltic material,
specification, refer to Terminology D1079.
under roof insulation or between multiple layers of roof
insulation. 3.2 Definitions of Terms Specific to This Standard:
3.2.1 lot—for the purpose of sampling, a lot shall consist of
1.2 The values stated in either SI units or inch-pound units
allmaterialofthesametypeandsizeofferedfordeliveryatone
are to be regarded separately as standard. The values stated in
time.
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
4. Materials and Manufacture
values from the two systems may result in nonconformance
4.1 In the process of manufacture, a single thickness of dry
with the standard.
organic felt shall be saturated with hot asphalt, coated on both
1.3 This international standard was developed in accor-
sides with a hot asphaltic material, and surfaced on the top side
dance with internationally recognized principles on standard-
with mineral surfacing.
ization established in the Decision on Principles for the
4.2 The felt shall be produced principally from organic
Development of International Standards, Guides and Recom-
fibers, or mixtures thereof. The surface of the felt shall be
mendations issued by the World Trade Organization Technical
uniform and relatively smooth. Upon splitting or tearing on the
Barriers to Trade (TBT) Committee.
bias,thefeltshallappearreasonablyfreeoflumpsandparticles
of foreign substances.
2. Referenced Documents
2.1 ASTM Standards: 4.3 The coating shall be a hot-applied asphalt material
permitted to be compounded with a mineral stabilizer.
D146/D146M Test Methods for Sampling and Testing
Bitumen-Saturated Felts and Woven Fabrics for Roofing
4.4 The reverse side of the base sheet may be covered with
and Waterproofing
a suitable material to prevent sticking in the roll.
D226/D226M Specification for Asphalt-Saturated Organic
5. Physical Properties
Felt Used in Roofing and Waterproofing
D228/D228M Test Methods for Sampling, Testing, and
5.1 The material shall conform to the physical requirements
Analysis of Asphalt Roll Roofing, Cap Sheets, and
prescribed in Table 1 and the dimensions and masses pre-
Shingles Used in Roofing and Waterproofing
scribed in Tables 2 and 3. Perforated base sheets shall conform
to the same requirements as the plain type but shall also have
uniformly spaced perforations.
This specification is under the jurisdiction of ASTM Committee D08 on
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.04
5.2 The finished product shall not crack nor be so sticky as
on Felts, Fabrics and Bituminous Sheet Materials.
to cause tearing or other damage upon being unrolled at
Current edition approved May 1, 2020. Published May 2020. Originally
approved in 1967. Last previous edition approved in 2012 as D2626/D2626M – 04 temperatures between 10 and 60 °C [50 and 140 °F].
(2012). DOI: 10.1520/D2626_D2626M-04R20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Dimensions, Mass, and Permissible Variations
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 The material shall conform to the dimensions and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. masses prescribed in Table 2.
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D2626/D2626M−04 (2020)
TABLE 1 Physical Requirements of Asphalt-Saturated and
7.3 The mineral surfacing shall be applied uniformly over
Coated Base Sheet
the entire surface of the top side of the sheet. If soap or other
Pliability, number of failures, max 2
material is used on the reverse side of the sheet, the amount
Behavior on heating no flowing, sagging,
applied shall not be so great as to interfere with adhesion
blistering, or absorption of
between the base sheet and plying cement. Coarse mica shall
the coating
Average breaking strength, min, kN/m
not be used on either surface.
[lbf/in.] width:
with fiber grain 6.1 [35]
7.4 The finished material shall be free of visible defects
across fiber grain 3.5 [20]
such as holes, ragged or untrue edges, breaks, cracks, tears,
A
Water vapor permeance, at 23 °C [73.4 °F], 17 [0.3]
2 2
protuberances, and indentations, except for intentionally pro-
max, ng/Pa·s·m [grains ⁄h·ft ·in·Hg]
A
vid
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