ASTM C208 - 22
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Designation: C208 −22
Standard Specification for
Cellulosic Fiber Insulating Board
1
This standard is issued under the fixed designation C208; 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
1.1 This specification covers the principal cellulosic fiber
insulating board types, grades, and sizes. Requirements are
specified for composition, construction, physical properties,
tolerances, sampling procedures, and test methods.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard.
1.3 When the installation or use of thermal insulation
materials, accessories, and systems may pose safety or health
problems, the manufacturer shall provide the user appropriate
current information regarding any known problems associated
with the recommended use of the company’s products and shall
also recommend protective measures to be employed in their
safe utilization. The user shall establish appropriate safety and
health practices and determine the applicability of regulatory
requirements prior to use.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
C165 Test Method for Measuring Compressive Properties of
Thermal Insulations
C168 Terminology Relating to Thermal Insulation
C209 Test Methods for Cellulosic Fiber Insulating Board
C390 Practice for Sampling and Acceptance of Thermal
Insulation Lots
C846 Practice for Application of Cellulosic Fiber Insulating
Board for Wall Sheathing
D1037 Test Methods for Evaluating Properties of Wood-
Base Fiber and Particle Panel Materials
D1554 Terminology Relating to Wood-Base Fiber and Par-
ticle Panel Materials
D2164 Methods of Testing Structural Insulating Roof Deck
(Withdrawn 2005)
3
E72 Test Methods of Conducting Strength Tests of Panels
for Building Construction
2.2 Federal Standard:
4900.1 Rev-1 U.S. Dept. of Housing and Urban Develop-
ment Minimum Property Standards, One and Two Family
Dwellings
4
3. Terminology
3.1 For definitions of terms used in this specification, see
Terminology C168 and Definitions D1554.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 cellulosic fiber insulating board—a fibrous-felted, ho-
mogeneous panel made from ligno-cellulosic fibers (usually
wood) and having a density of less than 31 lb/ft
3
(497 kg/m
3
)
but more than 10 lb/ft
3
(160 kg/m
3
).
3.2.1.1 Discussion—Cellulosic fiber insulating board is
characterized by an integral bond which is produced by
interfelting of the fibers, but which has not been consolidated
under heat and pressure as a separate stage in manufacture.
Other materials may be added during manufacture to improve
certain properties.
4. Classification
4.1 Insulating board covered by this specification consists of
six types:
4.1.1 Type I—Sound deadening board, for use in wall
assemblies to control sound transmissions.
1
This specification is under the jurisdiction of ASTM Committee C16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.22 on
Organic and Nonhomogeneous Inorganic Thermal Insulations.
Current edition approved March 1, 2022. Published March 2022. Originally
approved in 1946 . Last previous edition approved in 2017 as C208 – 12 (2017)
ε2
.
DOI: 10.1520/C0208-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
The last approved version of this historical standard is referenced on
www.astm.org.
4
Available from the U.S. Department of Housing and Urban Development,
Construction Standards Division, HUD Building, Washington, DC 20410.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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.
1
4.1.2 Type II—Roof insulation board, for use as insulation
and cover boards in various roofing systems.
4.1.2.1 Grade 1—Primarily for use under built-up, and
modified bitumen roof systems.
4.1.2.2 Grade 2—Primarily for use under single-ply, built-
up, and modified bitumen roofing systems.
4.1.3 Type III—Ceiling tiles and panels.
4.1.3.1 Grade 1—Nonacoustical, for use as decorative wall
and ceiling coverings.
4.1.3.2 Grade 2—Acoustical, for use as decorative, sound
absorbing wall and ceiling coverings.
4.1.4 Type IV—Wall Sheathing.
4.1.4.1 Grade 1—Regular, for use as wall sheathing in
frame construction.
4.1.4.2 Grade 2—Structural, for use as wall sheathing in
frame construction. When installed in accordance with Practice
C846, structural wall sheathing provides adequate racking
resistance for use as exterior wall bracing.
4.1.5 Type V—Backer board, for use behind exterior finish
in wall assemblies where there are no structural requirements.
4.1.6 Type VI—Roof deck, for use as roof decking for flat,
pitched, or shed-type, open-beamed, ceiling-roof construction.
4.2 On occasion these products are used for other applica-
tions. The manufacturer and the purchaser shall agree upon any
special requirements for such end uses.
5. Materials and Manufacture
5.1 Cellulosic fiber insulating board shall be manufactured
from refined or partially refined ligno-cellulosic (usually wood)
fibers, by a felting or molding process, into homogeneous
panels. Other ingredients may be added to provide or improve
certain properties such as strength and water resistance, in
addition to surface finishes for decorative products and special
coatings which impart resistance to flame spread. The material
is subjected to such drying temperatures as to effect complete
destruction of rot producing fungi.
5.2 The finished board may be either single or multiple ply.
When multiple-ply boards are supplied, a suitable moisture-
resistant adhesive shall be used to join the plies.
6. Physical Properties
6.1 The insulating board shall conform to the physical
properties in Table 1.
6.2 Type II roof insulation products may be laminated from
multiple plies of thinner board stock. For those thicknesses of
roof insulation products not listed in Table 1, and which are
laminated from thinner board stock, the thinner board stock
shall be tested for conformance to physical property require-
ments of the respective thinner board stock’s grade and
thickness listed in Table 1.
7. Dimensions, Mass, and Permissible Variations
7.1 The materials covered by this specification are available
in the sizes shown in Table 2.
7.2 Length and Width Tolerances—Unless otherwise
specified, the tolerance for length and width of any size panel
shall by + 0, −
1
⁄
16
in. per ft ( + 0, − 5.2 mm ⁄m), but the total
tolerance in any dimension shall not exceed + 0, −
3
⁄
8
in. ( + 0
mm, − 10 mm).
7.3 Thickness Tolerance—The thickness tolerances are
shown in Table 3.
TABLE 1 Physical Property Requirements for Cellulosic Fiber Insulating Board
Physical
Requirements
Sound Deadening
Board
1
⁄
2
in.
(13 mm)
thick
Roof Insulation Board
Grade 1 Grade 2
7
⁄
16
in.
(11 mm)
thick
1
⁄
2
in.
(13 mm)
thick
1in.
(25 mm)
thick
2in.
(51 mm)
thick
1
⁄
2
in.
(13 mm)
thick
1in.
(25 mm)
thick
2in.
(51 mm)
thick
Thermal conductivity (k), max, 0.38 0.38 0.38 0.38 0.38 0.50 0.40 0.40
Btu· in./h· ft
2
·°F (W/m·K) at mean
temperature of 75± 5°F (24 ± 3°C)
(0.055) (0.055) (0.055) (0.055) (0.055) (0.072) (0.058) (0.058)
Transverse strength either direction,
min, lbf (N)
12
(53.4)
7
(31.1)
7
(31.1)
14
(62.3)
28
(124.6)
12
(53.4)
24
(107)
36
(160)
Tensile strength parallel to surface, min,
lbf/in.2(kPa)
B
150
(1034)
50
(345)
50
(345)
50
(345)
... 150
(1034)
150
(1034)
...
Tensile strength perpendicular to
surface, min, lbf/ft
2
(kPa)
600
(28.7)
500
(23.9)
500
(23.9)
500
(23.9)
500
(23.9)
600
(28.7)
600
(28.7)
600
(28.7)
Water absorption by volume, max,% 7 10 10 10 10 7 7 7
Linear expansion, 50–90 % RH, max,% 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Flame Spread Index, finish surface,
max
... ... ... ... ... ... ... ...
Vapor permeance, grains/h·ft
2
·in. Hg
pressure differential, (mg/s·m
2
·kPa) min
5
(0.287)
... ... ... ... ... ... ...
Modulus of rupture, min, lbf/in.
2
(kPa) 240
(1655)
140
(965)
140
(965)
80
(552)
40
(276)
275
(1896)
140
(965)
70
(483)
Deflection at specified min load, max,
in. (mm)
0.85
(22)
1.25
(32)
1.25
(32)
0.62
(16)
0.31
(8)
0.75
(19)
0.42
(11)
0.21
(5)
Modulus of Elasticity, min, lbf/in.
2
×10
3
(mPa)
F
... ... ... ... ... ... ... ...
Deflection Span Ratio, max
F
... ... ... ... ... ... ... ...
Moisture content by weight, max,% 10 10 10 10 10 10 10 10
Racking Load
G
, min plf (N/m) ... ... ... ... ... ... ... ...
Compressive Strength
H
, min, lbf/in.
2
(kPa)
... 14.5
(100)
14.5
(100)
14.5
(100)
14.5
(100)
15
(105)
15
(105)
15
(105)
C208 − 22
2
8. Workmanship, Finish, and Appearance
8.1 Defects—The insulating board shall have no defects that
will adversely affect its service qualities. The surface shall be
free of cracks, lumps, excessive departure from planeness, or
other defects that affect performance or appearance.
8.2 Surface Finish—The surface finishes of the board shall
be as specified in Table 2.
8.3 Edge Details—The edge details of the board shall be as
specified in Table 2.
9. Sampling
9.1 Unless otherwise specified in the purchase order or
contract, the material shall be sampled in accordance with
Practice C390.
10. Test Methods
10.1 Unless otherwise specified in Table 1, determine the
properties enumerated in this specification in accordance with
Test Methods C209.
11. Inspection and Resubmittal
11.1 The following requirements are generally employed for
purposes of acceptance sampling of lots or shipments of
qualified material:
11.1.1 Surface finish,
11.1.2 Edge detail,
11.1.3 Dimensional tolerances, and
11.1.4 Workmanship.
TABLE 1 Physical Property Requirements for Cellulosic Fiber Insulating Board (continued)
Physical
Requirements
Ceiling Tiles and Panels (Both
Grades)
A
1
⁄
2
in.
(13 mm)
9
⁄
16
in.
(14 mm)
5
⁄
8
in.
(16 mm)
Wall Sheathing Backer Board
7
⁄
16
in.
(11 mm)
3
⁄
8
in.
(10 mm)
thick
Roof Deck
1
1
⁄
2
in.
(38 mm)
2in.
(51 mm)
3in.
(76 mm)
thick
Regular Structural
1
⁄
2
in.
(13 mm)
thick
1
⁄
2
in.
(13 mm)
thick
25
⁄
32
in.
(20 mm)
thick
Thermal conductivity (k), max, 0.38 0.40 0.44 0.40 0.40 0.40
Btu· in./h· ft
2
·°F (W/m·K) at mean
temperature of 75± 5°F (24 ± 3°C)
(0.055) (0.058) (0.063) (0.058) (0.058) (0.058)
Transverse strength either direction,
min, lbf (N)
10
(44.5)
14
(62.3)
20
(89.0)
25
(111.2)
6
(27)
...
Tensile strength parallel to surface,
min, lbf/in.
2
(kPa)
B
150
(1034)
150
(1034)
200
(1379)
150
(1034)
150
(1034)
...
Tensile strength perpendicular to
surface, min, lbf/ft
2
(kPa)
600
(28.7)
600
(28.7)
800
(38.3)
600
(28.7)
600
(28.7)
600
(28.7)
Water absorption by volume, max,% ... 7
C
7710
Linear expansion, 50–90 % RH,
max,%
0.5 0.5 0.6 0.5 0.5 0.5
Flame Spread Index, finish surface,
max
200 ... ... ... ... 200
Vapor permeance, grains/h·ft
2
·in.
Hg pressure differential, (mg/
s·m
2
·kPa) min
... 5
(0.287)
5
(0.287)
5
(0.287) 5
(0.287)
D
Modulus of rupture, min, lbf/in.
2
(kPa)
... 275
(1896)
400
(2758)
200
(1379)
200
(1379)
E
Deflection at specified min load,
max, in. (mm)
... 0.75
(19)
0.75
(19)
0.56
(14)
1.18
(30)
...
Modulus of Elasticity, min, lbf/
in.2×10
3
(mPa)
F
... ... ... ... ... 40
(276)
Deflection Span Ratio, max
F
... ... ... ... ... 1/240
Moisture content by weight, max,% 10 10 10 10 10 10
Racking Load
G
, min plf (N/m) ... ... 650
(9500)
650
(9500) ... ...
A
Physical properties listed in this column, except flame spread index, apply to the base material before punching, drilling, perforating, or embossing.
B
Tensile strength requirements shall be applicable only on thicknesses up to and including 1 in. (25 mm).
C
Water absorption for
1
⁄
2
in. (13 mm) structural wall sheathing is determined by the 24-h test in accordance with Test Methods D1037 using 15 % as the maximum. Water
absorption for all other products is determined by the 2-h test in accordance with Test Methods C209.
D
For roof deck products with a vapor retarder, the maximum should be 0.5 (0.029). For roof deck products manufactured without a vapor retarder, there is no requirement
for permeance.
E
For roof decking, Modulus of Rupture (MOR) is determined using Methods D2164. Matched samples are to be tested before and after accelerated aging. Minimum MOR
for unaged samples shall be 225 lbf/in.
2
(155 kPa). For aged samples, the minimum shall be no less than 50 % of the unaged test result.
F
Using Methods D2164.
G
The specified racking results are as tested in accordance with Test Methods E72 when the product is applied vertically and fastened 6 in. (152 mm) apart to intermediate
framing and 3 in. (76 mm) apart around the edges of the sheets using Number 11 gage galvanized roofing nails with
7
⁄
16
in. (11 mm) head diameters 1
1
⁄
4
in. (32 mm) long
for
1
⁄
2
in. (13 mm) and 1
1
⁄
2
in. (38 mm) for
25
⁄
32
in. (20 mm). The panels shall be tightly butted. Nails shall be
3
⁄
8
in. (10 mm) from the edges along the center stud and shall
be moved to the centerline of other framing. Alternative installation methods as specified by the manufacturer shall be permitted provided the alternative methods achieve
a minimum of 650 plf (9500 N/m).
H
Tested in accordance with Test Method C165 Procedure B with a crosshead speed of 0.05 in. (1.27 mm) per minute after conditioning. Reported values are at 10 %
compression.
C208 − 22
3
摘要：
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ASTM C208 - 22 是美国材料与试验协会发布的最新版本标准规范，全称为“Standard Specification for Cellulosic Fiber Insulating Board”（纤维素纤维绝缘板标准规范）。该标准适用于由木纤维、纸纤维或其他纤维素材料制成的绝缘板产品，主要用于建筑中的热绝缘和声学控制。文档明确了纤维素绝缘板的分类、物理性能要求（如密度、热导率、抗弯强度、线性收缩率）、尺寸公差、含水率限制以及防火性能测试方法。此外，标准还涵盖了产品标识、取样规则和合格判
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