ASTM C208-22

Standard Specification for Cellulosic Fiber Insulating Board

ABSTRACT
This specification covers the principal cellulosic fiber insulating board types, grades, and sizes. Insulating board covered by this specification consists of six types: Types I, II (Grades 1 and 2), III (Grades 1 and 2), IV (Grades 1 and 2), V, and VI. Cellulosic fiber insulating board shall be manufactured from refined or partially refined ligno-cellulosic (wood or cane) fibers, by felting or molding process, into homogeneous panels. The insulating board shall conform to the physical properties specified.
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 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.

General Information

• Status: Published
• Publication Date: 28-Feb-2022
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.22 - Organic and Nonhomogeneous Inorganic Thermal Insulations

Relations

• Refers: ASTM C209-20 - Standard Test Methods for Cellulosic Fiber Insulating Board
• Effective Date: 15-Mar-2020

Standards Content (Sample)

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.
Designation:C208 −22
Standard Specification for
1
Cellulosic Fiber Insulating Board
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 C390Practice for Sampling and Acceptance of Thermal
Insulation Lots
1.1 This specification covers the principal cellulosic fiber
C846Practice forApplication of Cellulosic Fiber Insulating
insulating board types, grades, and sizes. Requirements are
Board for Wall Sheathing
specified for composition, construction, physical properties,
D1037Test Methods for Evaluating Properties of Wood-
tolerances, sampling procedures, and test methods.
Base Fiber and Particle Panel Materials
1.2 The values stated in inch-pound units are to be regarded
D1554Terminology Relating to Wood-Base Fiber and Par-
as standard. The values given in parentheses are mathematical
ticle Panel Materials
conversions to SI units that are provided for information only
D2164Methods of Testing Structural Insulating Roof Deck
3
and are not considered standard.
(Withdrawn 2005)
1.3 When the installation or use of thermal insulation E72Test Methods of Conducting Strength Tests of Panels
for Building Construction
materials, accessories, and systems may pose safety or health
problems, the manufacturer shall provide the user appropriate
2.2 Federal Standard:
current information regarding any known problems associated
4900.1Rev-1 U.S. Dept. of Housing and Urban Develop-
withtherecommendeduseofthecompany’sproductsandshall
ment Minimum Property Standards, One and Two Family
4
also recommend protective measures to be employed in their
Dwellings
safe utilization. The user shall establish appropriate safety and
3. Terminology
health practices and determine the applicability of regulatory
requirements prior to use.
3.1 For definitions of terms used in this specification, see
1.4 This international standard was developed in accor- Terminology C168 and Definitions D1554.
dance with internationally recognized principles on standard-
3.2 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.2.1 cellulosic fiber insulating board—a fibrous-felted, ho-
Development of International Standards, Guides and Recom-
mogeneous panel made from ligno-cellulosic fibers (usually
mendations issued by the World Trade Organization Technical
3 3
wood) and having a density of less than 31 lb/ft (497 kg/m )
Barriers to Trade (TBT) Committee. 3 3
but more than 10 lb/ft (160 kg/m ).
3.2.1.1 Discussion—Cellulosic fiber insulating board is
2. Referenced Documents
characterized by an integral bond which is produced by
2
2.1 ASTM Standards:
interfelting of the fibers, but which has not been consolidated
C165Test Method for Measuring Compressive Properties of under heat and pressure as a separate stage in manufacture.
Thermal Insulations
Other materials may be added during manufacture to improve
C168Terminology Relating to Thermal Insulation certain properties.
C209Test Methods for Cellulosic Fiber Insulating Board
4. Classification
4.1 Insulatingboardcoveredbythisspecificationconsistsof
1
six types:
This specification is under the jurisdiction of ASTM Committee C16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.22 on
4.1.1 Type I—Sound deadening board, for use in wall
Organic and Nonhomogeneous Inorganic Thermal Insulations.
assemblies to control sound transmissions.
Current edition approved March 1, 2022. Published March 2022. Originally
ε2
approved in 1946. Last previous edition approved in 2017 as C208–12(2017) .
DOI: 10.1520/C0208-22.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.astm.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from the U.S. Department of Housing and Urban Development,
theASTM website. 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
1

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C208−22
4.1.2 Type II—Roof insulation board, for use as insulation certain properties such as strength and wat
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´2
Designation: C208 − 12 (Reapproved 2017) C208 − 22
Standard Specification for
1
Cellulosic Fiber Insulating Board
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
ε NOTE—Editorially added missing SI conversions in September 2017.
2
ε NOTE—Editorially corrected Table 1 in November 2019.
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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
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 Particle Panel Materials
3
D2164 Methods of Testing Structural Insulating Roof Deck (Withdrawn 2005)
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 Sept. 1, 2017March 1, 2022. Published December 2017March 2022. Originally approved in 1946 . Last previous edition approved in 20122017
ε2
as C208 – 12.C208 – 12 (2017) . DOI: 10.1520/C0208-12R17E02.10.1520/C0208-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C208 − 22
TABLE 1 Physical Property Requirements for Cellulosic Fiber Insulating Board
Sound Deadening Roof Insulation Board
Board
Grade 1 Grade 2
1
Physical
⁄2 in.
7 1 1
⁄16 in. ⁄2 in. 1 in. 2 in. ⁄2 in. 1 in. 2 in.
Requirements
(13 mm)
(11 mm) (13 mm) (25 mm) (51 mm) (13 mm) (25 mm) (51 mm)
thick
thick thick thick thick thick thick thick
Thermal conductivity (k), max, 0.38 0.38 0.38 0.38 0.38 0.50 0.40 0.40
2
Btu· in./h· ft ·°F (W/m·K) at mean (0.055) (0.055) (0.055) (0.055) (0.055) (0.072) (0.058) (0.058)
temperature of 75± 5°F (24 ± 3°C)
Transverse strength either direction, 12 7 7 14 28 12 24 36
min, lbf (N) (53.4) (31.1) (31.1) (62.3) (124.6) (53.4) (107) (160)
Tensile strength parallel to surface, min, 150 50 50 50 . 150 150 .
2
B
lbf/in. (kPa) (1034) (345) (345) (345) (1034) (1034)
Tensile strength perpendicular to 600 500 500 500 500 600 600 600
2
surface, min, lbf/ft (kPa) (28.7) (23.9) (23.9) (23.9) (23.9) (28.7) (28.7) (28.7)
Water absorption by volume, max,
...