ASTM D4990-97a

Standard Specification for Coal Tar Glass Felt Used in Roofing and Waterproofing

SCOPE
1.1 This specification covers glass felt impregnated with coal tar to be used with coal tar pitch conforming to the appropriate requirements of Specification D 450 in construction of built-up roofs and in the construction waterproofing systems.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following safety hazards caveat pertains only to the test methods 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jul-1997
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: D08 - Roofing and Waterproofing
• Drafting Committee: D08.04 - Felts, Fabrics and Bituminous Sheet Materials

Relations

• Replaced By: ASTM D4990-97a(2005)e1 - Standard Specification for Coal Tar Glass Felt Used in Roofing and Waterproofing
• Effective Date: 01-Mar-2005
• Referred By: ASTM D2829/D2829M-07(2023) - Standard Practice for Sampling and Analysis of Existing Built-Up Roof Systems
• Effective Date: 10-Jul-1997
• Referred By: ASTM C981-20 - Standard Guide for Design of Built-Up Bituminous Membrane Waterproofing Systems for Building Decks
• Effective Date: 10-Jul-1997
• Referred By: ASTM D6622/D6622M-20 - Standard Guide for Application of Fully Adhered Hot-Applied Reinforced Waterproofing Systems
• Effective Date: 10-Jul-1997

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 4990 – 97a
Standard Specification for
Coal Tar Glass Felt Used in Roofing and Waterproofing
This standard is issued under the fixed designation D 4990; 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.
1. Scope 4. Classification
1.1 This specification covers glass felt impregnated with 4.1 Coal tar impregnated glass felt covered by this specifi-
coal tar intended to be used with coal tar pitch conforming to cation is of one type.
the appropriate requirements of Specification D 450 in con-
5. Materials and Manufacture
struction of built-up roofs and in the construction waterproof-
ing systems. 5.1 The felt shall be a thin, porous sheet of uniformly
distributed glass fibers, with or without the addition of rein-
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for forcing stranded glass yarns, and bonded with a water-resistant
resinous binder.
information only.
1.3 The following safety hazards caveat pertains only to the 5.2 In the process of manufacture, the felt shall be impreg-
nated with coal-tar which shall be permitted to contain a
test methods portion, Section 8, of this specification: This
standard does not purport to address all of the safety concerns, mineral stabilizer so that the individual glass fibers are coated
and the coal tar is evenly distributed throughout.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health 5.3 The impregnated glass felt shall be surfaced lightly with
a suitable finely comminuted material to prevent sticking in the
practices and determine the applicability of regulatory limita-
tions prior to use. roll. The nature and quantity of the surfacing material shall not
interfere with adhesion between the plies of a membrane.
2. Referenced Documents
6. Physical Properties, Dimensions, and Masses
2.1 ASTM Standards:
6.1 The material shall conform to the physical properties,
D 146 Test Methods for Sampling and Testing Bitumen-
Saturated Felts and Woven Fabrics for Roofing and Wa- dimensions, and masses prescribed in Table 1 and Table 2.
terproofing 6.2 The finished product shall not crack nor be so sticky as
to cause tearing or other damage upon being unrolled at
D 450 Specification for Coal-Tar Pitch Used in Roofing,
Dampproofing and Waterproofing temperatures between 50 and 140°F (10 and 60°C).
6.3 After extraction of the coal-tar in accordance with
D 1079 Terminology Relating to Roofing, Waterproofing,
and Bituminous Materials Section 16 of Test Methods D 146, the desaturated felt shall
remain flat and unbuckled, shall retain its original shape and
3. Terminology
dimensions, and individual fibers shall remain firmly set in
3.1 Definitions—For definitions of terms used in this speci- place.
fication, refer to Terminology D 1079. 6.4 The pliability specimen shall be conditioned in air at 77
3.2 Definitions of Terms Specific to This Standard: 6 2°F (25 6 1°C) for at least 1 h and tested in a room
3.2.1 net dry mass—the mass of the coal tar impregnated maintained at the same temperature (immersion in water not
glass felt exclusive of wrapping and packing material, after required). Otherwise, follow Test Methods D 146, 14.1 in
drying to constant weight and after removing all detached section on Pliability.
comminuted surfacing material as described in 8.2.
7. Workmanship, Finish, and Appearance
7.1 The finished material shall be uniformly impregnated
This specification is under the jurisdiction of ASTM Committee D08 on
with coal tar of uniform thickness, and shall be free of visible
Roofing,Waterproofing, and Bituminous Materials and is the direct responsibility of
defects such as ragged or untrue edges, breaks, cracks, tears
Subcommittee D08.04 on Felts and Fabrics for Bituminous Roofing and Water-
and protuberances. It shall contain closely spaced pinholes not
proofing.
Current edition approved July 10, 1997. Published January 1998. Originally
over ⁄32 in. (0.8 mm) in diameter over the entire area of the
published as D 4990 – 89. Last previous edition D 4990 – 97.
felt. Individual holes up to ⁄4 in. (6.3 mm) in diameter shall be
Annual Book of ASTM Standards, Vol 04.04.
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D 4990
TABLE 1 Physical Properties
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