ASTM D2626-97b
(Specification)Standard Specification for Asphalt-Saturated and Coated Organic Felt Base Sheet Used in Roofing
Standard Specification for Asphalt-Saturated and Coated Organic Felt Base Sheet Used in Roofing
SCOPE
1.1 This specification covers asphalt-saturated and coated organic felt base sheet with fine mineral surfacing on the top side, with or without perforations, for use as the first ply of a built-up roof. When not perforated this sheet may be used as a vapor retarder under roof insulation.
1.2 The values stated in inch-pound units are to be regarded as the standard.
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Designation: D 2626 – 97b
Standard Specification for
Asphalt-Saturated and Coated Organic Felt Base Sheet
Used in Roofing
This standard is issued under the fixed designation D 2626; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Materials and Manufacture
1.1 This specification covers asphalt-saturated and coated 4.1 In the process of manufacture, a single thickness of dry
organic felt base sheet with mineral surfacing on the top side, organic felt shall be saturated with hot asphalt, coated on both
with or without perforations, for use as the first ply of a sides with a hot asphaltic material, and surfaced on the top side
built-up roof. When not perforated this sheet is suitable for use with mineral surfacing.
as a vapor retarder, with a solid mopping of asphaltic material, 4.2 The felt shall be produced principally from organic
under roof insulation or between multiple layers of roof fibers, or mixtures thereof. The surface of the felt shall be
insulation. uniform and relatively smooth. Upon splitting or tearing on the
1.2 The values stated in inch-pound units are to be regarded bias, the felt shall appear reasonably free of lumps and particles
as the standard. of foreign substances.
4.3 The coating shall be a hot-applied asphalt material
2. Referenced Documents
permitted to be compounded with a mineral stabilizer.
2.1 ASTM Standards:
4.4 The reverse side of the base sheet may be covered with
D 146 Test Methods for Sampling and Testing Bitumen- a suitable material to prevent sticking in the roll.
Saturated Felts and Woven Fabrics for Roofing and Wa-
5. Physical Properties
terproofing
D 226 Specification for Asphalt-Saturated Organic Felt 5.1 The material shall conform to the physical requirements
Used in Roofing and Waterproofing prescribed in Table 1 and the dimensions and masses pre-
D 228 Test Methods for Asphalt Roll Roofing, Cap Sheets, scribed in Table 2 and Table 3. Perforated base sheets shall
and Shingles conform to the same requirements as the plain type but shall
D 1079 Terminology Relating to Roofing, Waterproofing, also have uniformly spaced perforations.
and Bituminous Materials 5.2 The finished product shall not crack nor be so sticky as
E 96 Test Methods for Water Vapor Transmission of Mate- to cause tearing or other damage upon being unrolled at
rials temperatures between 50 and 140°F (10 and 60°C).
3. Terminology 6. Dimensions, Mass, and Permissible Variations
3.1 Definitions—For definitions of terms used in this speci- 6.1 The material shall conform to the dimensions and
fication, refer to Terminology D 1079. masses prescribed in Table 2.
3.2 Definitions of Terms Specific to This Standard: 6.2 Perforated material shall also conform to the dimensions
3.2.1 lot—for the purpose of sampling, a lot shall consist of and other requirements prescribed in Table 3.
all material of the same type and size offered for delivery at one
7. Workmanship, Finish, and Appearance
time.
7.1 The felt shall be thoroughly and uniformly saturated,
and shall show no unsaturated spots at any point upon cutting
This specification is under the jurisdiction of ASTM Committee D08 on
2-in. (50-mm) wide strips at random across the entire width of
Roofing, Waterproofing, and Bituminous Materials and is the direct responsibility of
the sheet and splitting them open for their full length.
Subcommittee D08.04 on Felts and Fabrics for Bituminous Roofing and Water-
proofing.
7.2 The coating shall be applied uniformly on both sides of
Current edition approved Nov. 10, 1997. Published February 1998. Originally
the sheet in a continuous, unbroken film that extends to the
published as D 2626 – 67 T. Last previous edition D 2626 – 97a.
edges of the sheet. The coating may be smooth or finely veined,
Annual Book of ASTM Standards, Vol 04.04.
but not coarsely veined.
Annual Book of ASTM Standards, Vol 04.06.
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D 2626 – 97b
TABLE 1 Physical Requirements of Asphalt-Saturated and
7.4 The finished material shall be free of visible defects
Coated Base Sheet
such as holes, ragged or untrue edges, breaks, cracks, tears,
Pliability, number of failures, max 2
protuberances, and indentations, except for intentionally pro-
Behavior on heating no flowing, sagging,
vided perforations and the associated protuberances.
blistering, or absorption of
the coating
8. Sampling and Test Methods
Average breaking strength, min, lbf/in.
(kN/m) width:
8.1 Sample the material and determine the properties enu-
with fiber grain 35 (6.1)
merated in this specification in accordance with Test Methods
across fiber
...
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