ASTM C406-06
(Specification)Standard Specification for Roofing Slate
Standard Specification for Roofing Slate
SCOPE
1.1 This specification covers the material characteristics, physical requirements, and sampling appropriate to the selection of slate for use as roof shingles.
1.2 Slates not included in this specification are those containing soft carbonaceous ribbons. The wide variation in physical properties and composition of such ribbon slates render their service life uncertain under some conditions of use.
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Designation: C 406 – 06
Standard Specification for
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Roofing Slate
This standard is issued under the fixed designation C 406; 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 inclusions of the original beds and are softer and less durable
than the surrounding material.
1.1 This specification covers the material characteristics,
physical requirements, and sampling appropriate to the selec-
4. Classification
tion of slate for use as roof shingles.
4.1 Roofing slate shall be classified by grade in accordance
1.2 Slates not included in this specification are those con-
with the physical requirements of Table 1, with the classifica-
taining soft carbonaceous ribbons. The wide variation in
tion limited to the test specimen thickness, or greater thickness,
physical properties and composition of such ribbon slates
as determined under Test Methods C 120.
render their service life uncertain under some conditions of
4.2 When comparing slates of the same grade and equal
use.
thickness, but from various sources, slates which meet the
2. Referenced Documents required breaking load at the lowest specimen thickness will
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yield the best performance on the roof in terms of resistance to
2.1 ASTM Standards:
impact damage.
C119 Terminology Relating to Dimension Stone
4.3 Expected service life of the various grades, depending
C 120 Test Methods of Flexure Testing of Slate (Breaking
on geographic location and environmental exposure, is as
Load, Modulus of Rupture, Modulus of Elasticity)
follows:
C 121 Test Method for Water Absorption of Slate
Grade Service Life (years)
C 217 Test Method for Weather Resistance of Slate
Grade S over 75
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Grade S 40 to 75
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3. Terminology
Grade S 20 to 40
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3.1 Definitions—Definitions shall be in accordance with
5. Ordering Information
TerminologyC119.
5.1 Color—The commercial color specified should be pre-
3.2 Definitions of Terms Specific to This Standard:
ceded by the words “unfading” or “semi-weathering” or
3.2.1 service life—a period of time over which the slate
“weathering” to indicate the allowable change in the original
material is expected to require no repair or replacement due to
slate color, over time, upon exposure on the roof.
weathering.
5.2 Standard Roofs—Sloping roofs utilizing a nominal
3.2.2 ribbons—narrow bands of carbonaceous material,
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thickness of ⁄16 to ⁄4 in. (4.8 to 6.4 mm), are known as
darker in color than the surrounding slate. These ribbons are
standard roofs. These shingles shall be rectangular unless
otherwise specified. These shingles shall be machine punched
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This specification is under the jurisdiction of ASTM Committee C18 on
or drilled for two nails located for proper headlap.
Dimension Stone and is the direct responsibility of Subcommittee C18.03 on
5.3 Textural Roofs—Sloping roofs utilizing various sizes,
Material Specifications.
thicknesses, textures, and colors for architectural effects, are
Current edition approved June 1, 2006. Published June 2006. Originally
known as textural roofs. These shingles shall be machine
approved in 1957 as C 406 – 57 T. Last previous edition approved in 2005 as
C 406 – 05.
punched or drilled for two nails located for proper headlap.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.4 Graduated Roofs—Sloping roofs utilizing a greater
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
range of sizes, thicknesses, and exposed lengths of shingles,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. are known as graduated roofs. The slates are arranged on the
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C406–06
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TABLE 1 Physical Requirements
6.3 Thecurvatureofshinglesshallnotexceed ⁄8in.in12in.
Absorp- Depth of (3 mm in 305 mm). Curved slate shall be sheared and punched
Breaking Load,
Classification tion, max, Softening, max,
A
to permit it to be laid with the convex side up.
min lbf(or N)
B C
% in. (mm)
6.4 “Knots” and “knurls” are rounded defects, which affect
Grade S 575 (2558) 0.25 0.002 (0.05)
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the smoothness of split. They are acceptable on the exposed
Grade S 575 (2558) 0.36 0.008 (0.20)
2
Grade S 575 (2558) 0.45 0.014 (0.36)
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portion of the top face but on other parts will prevent close
A
See Test Methods C 120.
contact of shingles. Shingles having knots or knurls on the
B
See Test Method C 121.
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covered portions projecting in excess of ⁄16 in. (1.5 mm) shall
C
See Test Method C 217.
not be us
...
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