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ASTM D6225-98

(Test Method)

Standard Test Method for Granule Cover of Mineral Surfaced Roofing

Standard Test Method for Granule Cover of Mineral Surfaced Roofing

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1.1 This test method covers the determination of the hiding power of granules on a mineral surfaced roofing sheet. The test is used primarily after an abrasion test has been conducted, to determine the portion of asphaltic compound that has been exposed as a result of the abrasion test.  
1.2 the values stated in inch-pound units are regarded as the standard. The SI units given in parentheses are for information only.  
1.3 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-Jan-1998
ICS
91.060.20 - Roofs
Technical Committee
D08 - Roofing and Waterproofing
Drafting Committee
D08.04 - Felts, Fabrics and Bituminous Sheet Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM D6225-98e1 - Standard Test Method for Granule Cover of Mineral Surfaced Roofing
Effective Date
10-Jan-1998

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ASTM D6225-98 - Standard Test Method for Granule Cover of Mineral Surfaced RoofingASTM D6225-98 - Standard Test Method for Granule Cover of Mineral Surfaced Roofing
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ASTM D6225-98 - Standard Test Method for Granule Cover of Mineral Surfaced Roofing
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 6225 – 98
Standard Test Method for
Granule Cover of Mineral Surfaced Roofing
This standard is issued under the fixed designation D 6225; 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 5.2 Transparency Overlay Grid—A transparency overlay
with grid markings. The transparency must be of sufficient size
1.1 This test method covers the determination of the hiding
to cover the area abraded by the abrasion test brush described
power of granules on a mineral surfaced roofing sheet. The test
in Test Method D 4977, 1.125 by 6.25 in. (28.6 by 159 mm)
is used primarily after an abrasion test has been conducted, to
with grid lines oriented to form squares 0.05 in. (1.27 mm) on
determine the portion of asphaltic compound that has been
a side (2160 squares/1.125 in. by 6.25 in. (28.6 by 159 mm)).
exposed as a result of the abrasion test.
The grid transparency must be capable of being positioned over
1.2 The values stated in inch-pound units are regarded as the
the sample and must permit the operator to clearly view the
standard. The SI units given in parentheses are for information
sample and should be partitioned into groups of squares to
only.
facilitate counting (see Fig. 1).
1.3 This standard does not purport to address all of the
5.3 Light Source—A high intensity lamp or fluorescent ring
safety concerns, if any, associated with its use. It is the
light, capable of providing sufficient illumination of the min-
responsibility of the user of this standard to establish appro-
eral surfaced sample to be examined.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Test Specimen
2. Referenced Documents 6.1 Cut a minimum of three 2 by 9 in. (50.8 by 229 mm) or
larger specimens. Specimens may be Test Method D 4977
2.1 ASTM Standards:
abrasion test samples.
D 4977 Test Method for Granule Adhesion to Mineral
2 6.2 Care should be taken so that granules do not transfer
Surfaced Roofing by Abrasion
from one specimen to another.
3. Summary of Test Method
7. Preparation of Apparatus
3.1 A sample of mineral surfaced roofing material is exam-
7.1 Place the specimen to be examined on a flat surface and
ined under a magnifying lens and the area left unprotected by
arrange the light source and magnifier so that the sample can be
granule cover is determined using a transparency overlay with
plainly viewed.
grid lines.
7.2 Abrasion test 2 by 9 in. (50.8 by 229 mm) specimens
4. Significance and Use
can be examined by removing the clamping tray from the
abrasion test machine and clamping the overlay grid directly
4.1 This test method is used to determine the extent of
over the specimen (see Fig. 2).
coverage of the granular surfacing over the asphaltic coating in
a sample of mineral surfaced roofing. The results determine
8. Procedure
compliance with the applicable specification requirements or
8.1 Remove any loose granules from the specimen with
may be used for comparative analysis. This test method applies
gentile tapping.
to both “as manufactured” material and material that has
8.2 Place the overlay grid so that it is in alignment with the
weathered or undergone other types of exposure.
area to be examined. In the case of abrasion test samples, the
5. Apparatus 1.25 in. by 6.25 in. (28.6 by 159 mm) portion of the grid should
be aligned with the abraded area of the sample.
5.1 Magnifier—An optical magnifier with a fixed power of
magnific
...

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4.1 The wind resistance of ballasted membrane roof systems is determined largely by the size and weight of the ballast used. ANSI/SPRI RP-4 provides a method for the wind design of ballasted single-ply membrane roof systems and includes specific guidelines for the size and weight of aggregate used as ballast. The aggregate size classifications provided in this standard are intended for use with the guidelines provided in ANSI/SPRI RP-4 in designing the wind resistance of aggregate ballasted single-ply membrane roof systems.  
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5.1 Excess moisture trapped in roofing or waterproofing systems can adversely affect performance and lead to premature failure of roofing or waterproofing systems and its components. It also reduces thermal resistance, resulting in reduced energy efficiency and inflated energy costs. Impedance scans can be effective in identifying concealed and entrapped moisture within roofing or waterproofing systems.  
5.2 This practice is intended to be used at various stages of the roofing and waterproofing system’s life such as: during or at completion of installation of roofing or waterproofing system to determine if there was moisture intrusion into the roofing or waterproofing system or underlying materials; at regular intervals as part of a preventative maintenance program; and to aid in condition assessment, or before replacement or repair work, or combinations thereof, to assist in determining the extent of work and replacement materials.  
5.3 This practice alone does not determine the cause of moisture infiltration into roofing or waterproofing systems; however, it can be used to help tracing excess moisture to the point of ingress.
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1.1 This practice applies to techniques that use nondestructive electrical impedance (EI) scanners to locate moisture and evaluate the comparative moisture content within insulated low-slope roofing and waterproofing systems.  
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1.4.1 Metal and other electrically conductive surface coverings and near-surface embedded metallic components are not suitable for surveying with impedance scanners because of the electrical conductivity of these materials.  
1.4.2 This practice is not appropriate for use with black EPDM, any membranes containing black EPDM, or black EPDM coatings because black EPDM gives false positive readings.  
1.4.3 Aluminum foil on top-faced insulation, roofing, or waterproofing membranes gives a false positive reading and is not suitable for surveying with impedance scanners; however, liquid-applied aluminum pigmented emulsified asphalt-based coatings shall not normally affect impedance scanner readings.
1.4.3.1 This practice is not appropriate for use with aluminium foil faced modified bitumen membranes, as the electrical conductivity of the aluminium foil surface can give false positive readings.  
1.4.4 While their overburden remains in place, this practice is not appropriate for use with inverted roof membrane assemblies (IRMAs) or protected roof assemblies (PRMAs), which contain above the deck waterproof membrane and overburden that may include insulation, drainage components, pavers, aggregate, ballast, vegetation, or combinations thereof, because the impedance scanner will not differentiate between above and below the membrane moisture.  
1.4.5 S...

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