ASTM C764-19

Standard Specification for Mineral Fiber Loose-Fill Thermal Insulation

ABSTRACT
This specification covers the composition and physical properties of nodulated mineral fiber thermal insulation for use in attics or enclosed spaces in housing and other framed buildings. The nodulated mineral fiber thermal insulation shall be of the following types: Type I and Type II. The basic material shall be fibers made from mineral substances such as rock, slag, or glass processed from the molten state into an incombustible fibrous form. The fibers shall be mechanically processed into nodules, and are permitted to be treated to provide improved processing and handling characteristics suitable for installation by pouring or pneumatic applications. The following test methods shall be performed for purposes of initial material product requirements: thermal resistance; critical radiant flux; combustion characteristics; water vapor sorption; odor emission; corrosiveness; and fungi resistance.
SIGNIFICANCE AND USE
10.1 This specification covers products that are used in buildings. While products that comply with this specification are used in various constructions, they are adaptable primarily, but not exclusively, to wood frame constructions.
SCOPE
1.1 This specification covers the composition and physical properties of nodulated mineral fiber thermal insulation for use in attics or enclosed spaces in housing and other framed buildings.  
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 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, health, and environmental practices and determine the applicability of regulatory limitations 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: 31-Aug-2019
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.23 - Blanket and Loose Fill Insulation

Relations

• Replaces: ASTM C764-17 - Standard Specification for Mineral Fiber Loose-Fill Thermal Insulation
• Effective Date: 01-Sep-2019
• Refers: ASTM C168-24 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2024
• Refers: ASTM E136-24a - Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 °C
• Effective Date: 01-Mar-2024
• Refers: ASTM C1630-24 - Standard Guide for Development of Coverage Charts for Loose-Fill Thermal Building Insulations
• Effective Date: 01-Mar-2024
• Refers: ASTM C390-08(2024) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Mar-2024
• Refers: ASTM C870-24 - Standard Practice for Conditioning of Thermal Insulating Materials
• Effective Date: 01-Mar-2024
• Refers: ASTM C1363-24 - Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus
• Effective Date: 01-Mar-2024
• Refers: ASTM E136-24 - Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 °C
• Effective Date: 01-Feb-2024
• Refers: ASTM E970-23 - Standard Test Method for Critical Radiant Flux of Exposed Attic Floor Insulation Using a Radiant Heat Energy Source
• Effective Date: 01-Oct-2023
• Refers: ASTM B152/B152M-19 - Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar
• Effective Date: 01-Oct-2019
• Refers: ASTM C390-08(2019) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Sep-2019
• Refers: ASTM C1104/C1104M-19 - Standard Test Method for Determining the Water Vapor Sorption of Unfaced Mineral Fiber Insulation
• Effective Date: 01-Sep-2019
• Refers: ASTM C1617-19 - Standard Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from Thermal Insulation on Aqueous Corrosion of Metals
• Effective Date: 01-May-2019
• Refers: ASTM E136-19 - Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750°C
• Effective Date: 01-Feb-2019
• Refers: ASTM C1859-18 - Standard Practice for Determination of Thermal Resistance of Loose-Fill Building Insulation in Side Wall Applications
• Effective Date: 15-Sep-2018

Overview

ASTM C764-19: Standard Specification for Mineral Fiber Loose-Fill Thermal Insulation defines performance and composition requirements for loose-fill mineral fiber insulation. This specification applies to nodulated mineral fiber products made from materials such as rock, slag, or glass, mechanically processed into incombustible fibers. Designed primarily for use in attics or enclosed spaces within residential and framed commercial buildings, ASTM C764-19 ensures that mineral fiber loose-fill insulation meets essential criteria for safety, performance, and durability. The specification classifies insulation into two types - Type I (pneumatic application) and Type II (poured application) - and covers critical tests for thermal resistance, combustibility, moisture performance, and additional physical properties.

Key Topics

• Types and Applications: Identifies Type I (applied pneumatically) and Type II (poured in place) mineral fiber loose-fill insulation, suitable for open attics and enclosed building cavities.
• Material Requirements: Insulation must be composed of rock wool, slag wool, or glass wool fibers, processed from molten state for incombustibility.
• Physical Properties:
  • Thermal Resistance (R-value): Must meet minimum performance for heat flow reduction.
  • Critical Radiant Flux: Assesses flame propagation resistance.
  • Combustion Characteristics: Limits temperature rise and flaming potential in fire exposure.
  • Water Vapor Sorption: Restricts moisture absorption to ensure insulation effectiveness.
  • Odor Emission: Controls strong, objectionable odors to ensure occupant comfort.
  • Corrosiveness: Requires insulation to be non-corrosive to common metals in buildings.
  • Fungi Resistance: Ensures insulation does not support fungal growth, bolstering indoor air quality.
• Quality Assurance: Products must be free of foreign materials, with clean, dry, and defect-free composition.

Applications

ASTM C764-19 mineral fiber loose-fill thermal insulation is widely used in the following contexts:

• Residential Construction: Provides effective attic and wall insulation in wood frame and other housing types.
• Commercial Buildings: Suitable for framed building spaces where loose-fill application increases energy efficiency.
• Retrofit and New Construction: Easily applied to existing structures via pneumatic blowing or pouring, facilitating upgrades to building envelopes.
• Thermal Performance Compliance: Assists builders and designers in meeting energy codes and green building standards through reliable R-value insulation.
• Moisture and Fire Control: Used in areas where resistance to moisture sorption and fire spread is critical.

By specifying rigorous testing for thermal and physical performance, ASTM C764-19 supports consistent product quality, helping professionals select the right insulation for safe, energy-efficient buildings.

Related Standards

To ensure comprehensive compliance, the use and testing of mineral fiber loose-fill thermal insulation often reference additional ASTM standards, including:

• ASTM C168 - Terminology Relating to Thermal Insulation
• ASTM C177, C518, C1363 - Test methods for measuring thermal performance
• ASTM C687, C1859 - Practices for determining thermal resistance of loose-fill insulation
• ASTM C1104 - Test method for water vapor sorption
• ASTM C1338 - Test method for fungi resistance
• ASTM E136, E970 - Fire resistance and critical radiant flux test methods
• ASTM C1304 - Test for odor emission
• ASTM C1617 - Corrosiveness testing on metals
• ASTM C1630, C1374, C1574 - Guides for blown density, coverage, and installed thickness

Consulting these standards alongside ASTM C764-19 helps ensure mineral fiber insulation projects are executed with consistent quality, safety, and regulatory alignment. For further technical guidance, referencing the full suite of applicable ASTM standards is recommended for architects, builders, and insulation professionals.

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:C764 −19
Standard Specification for
Mineral Fiber Loose-Fill Thermal Insulation
This standard is issued under the fixed designation C764; 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 Properties by Means of the Heat Flow Meter Apparatus
C687 Practice for Determination of Thermal Resistance of
1.1 This specification covers the composition and physical
Loose-Fill Building Insulation
properties of nodulated mineral fiber thermal insulation for use
C870 Practice for Conditioning of Thermal Insulating Ma-
in attics or enclosed spaces in housing and other framed
terials
buildings.
C1104/C1104M Test Method for Determining the Water
1.2 The values stated in inch-pound units are to be regarded
Vapor Sorption of Unfaced Mineral Fiber Insulation
as standard. The values given in parentheses are mathematical
C1304 Test Method for Assessing the Odor Emission of
conversions to SI units that are provided for information only
Thermal Insulation Materials
and are not considered standard.
C1338 Test Method for Determining Fungi Resistance of
1.3 This standard does not purport to address all of the
Insulation Materials and Facings
safety concerns, if any, associated with its use. It is the C1363 Test Method for Thermal Performance of Building
responsibility of the user of this standard to establish appro-
Materials and Envelope Assemblies by Means of a Hot
priate safety, health, and environmental practices and deter- Box Apparatus
mine the applicability of regulatory limitations prior to use.
C1374 Test Method for Determination of Installed Thick-
1.4 This international standard was developed in accor- ness of Pneumatically Applied Loose-Fill Building Insu-
dance with internationally recognized principles on standard-
lation
ization established in the Decision on Principles for the C1574 Guide for Determining Blown Density of Pneumati-
Development of International Standards, Guides and Recom-
callyAppliedLoose-FillMineralFiberThermalInsulation
mendations issued by the World Trade Organization Technical C1617 Practice for Quantitative Accelerated Laboratory
Barriers to Trade (TBT) Committee.
Evaluation of Extraction Solutions Containing Ions
Leached from Thermal Insulation on Aqueous Corrosion
2. Referenced Documents
of Metals
C1630 Guide for Development of Coverage Charts for
2.1 ASTM Standards:
Loose-Fill Thermal Building Insulations
B152/B152M Specification for Copper Sheet, Strip, Plate,
C1859 Practice for Determination of Thermal Resistance of
and Rolled Bar
Pneumatically Installed Loose-Fill Building Insulation
C168 Terminology Relating to Thermal Insulation
(Behind Netting) for Enclosed Applications of the Build-
C177 Test Method for Steady-State Heat Flux Measure-
ing Thermal Envelope
ments and Thermal Transmission Properties by Means of
E136 TestMethodforAssessingCombustibilityofMaterials
the Guarded-Hot-Plate Apparatus
Using a Vertical Tube Furnace at 750°C
C390 Practice for Sampling and Acceptance of Thermal
E970 TestMethodforCriticalRadiantFluxofExposedAttic
Insulation Lots
Floor Insulation Using a Radiant Heat Energy Source
C518 Test Method for Steady-State Thermal Transmission
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
sion Test Specimens
This specification is under the jurisdiction of ASTM Committee C16 on
3. Terminology
Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on
Blanket and Loose Fill Insulation.
3.1 Definitions—For definitions of terms used in this
Current edition approved Sept. 1, 2019. Published September 2019. Originally
specification, refer to Terminology C168.
approved in 1973. Last previous edition approved in 2017 as C764 – 17. DOI:
10.1520/C0764-19.
3.2 Definitions of Terms Specific to This Standard:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.1 settled density—The mass per unit volume of a loose-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
fill insulation after which time or forces, or both, have exerted
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. their effect upon thickness.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C764−19
3.2.1.1 Discussion—The settled density is determined using 12.2, nor shall any single specimen be more than 10 % below
long term aging studies in attics. the mutually agreed upon R value.
7.2 Critical Radiant Flux—Mineral fiber loose fill when
4. Classification
tested in accordance with 12.3 shall have a critical radiant
2 2
4.1 The nodulated mineral fiber thermal insulation shall be
flux-flamepropagationresistance≥0.12W/cm (.11Btu/ft ·s).
of the following types and classes:
7.3 Combustion Characteristics—Mineral fiber loose fill
4.1.1 Type I—Pneumatic application.
when tested in accordance with 12.4 shall not have a recorded
4.1.2 Type II—Poured application.
temperature rise of more than 54°F (30°C); shall have no
5. Ordering Information flaming after the first 30 s; and, if the specimen weight loss
exceeds 50 % during the test, the recorded temperature of the
5.1 Both types of nodulated mineral fiber thermal insulation
specimen during the test shall not rise above the furnace air
are intended for use as thermal insulation in open spaces, such
temperature at the beginning of the test, and there shall be no
as attics and enclosed spaces, such as walls, in housing and
flaming of the specimen.
buildingsatambienttemperatures.TypeIisusedforpneumatic
application(blownorconveyedbyanairstreamthroughahose 7.4 Water Vapor Sorption—The water vapor sorption of the
and discharged over the area to be insulated). Type II is used insulation shall not be more than 5 % by weight when tested in
for application by pouring in place. accordance with 12.5.
7.5 Odor Emission—A detectable odor of a strong objec-
6. Materials and Manufacture
tionable nature recorded by more than two of the five panel
6.1 Basic Material—The basic material shall be fibers made
members shall constitute rejection of the material when tested
from mineral substances such as rock, slag, or glass processed
in accordance with 12.6.
from the molten state into an incombustible fibrous form.
7.6 Corrosiveness—When tested in accordance with 12.7,
6.2 Manufacture—The fibers shall be mechanically pro-
the metal plates that are in contact with the insulation shall
cessed into nodules, and are permitted to be treated to provide
show no corrosion greater than the comparative plates that are
improved processing and handling characteristics suitable for
in contact with sterile cotton that has been tested in the same
installation by pouring or pneumatic applications.
manner.
7.7 Fungi Resistance—When tested in accordance with
7. Physical Properties
12.9, the insulation shall have growth no greater than that
7.1 Thermal Characteristics—The standard thermal resis-
observed on the white birch tongue depressor comparative
tance values normally recommended for open application are
2 2 material.
expressed in °F·h·ft /Btu (K·m /W). Typical values are shown
in Table 1. R values others than those listed in Table 1 shall be
8. Other Requirements
as agreed upon between the supplier and the purchaser. The
thermal resistance R for the average of any (four) randomly 8.1 Qualification Requirements—The following require-
selected samples shall not be more than 5 % below the ments are generally emphasized for purposes of initial material
mutually agreed upon R value when tested in accordance with product requirements:
TABLE 1 Coverage Chart
NOTE 1—Chart is occasionally given in metric units.
R Value at 75°F Mean
Maximum Net Coverage Minimum Thickness Minimum Weight per ft
Temperature
2 2 2
To obtain an insulation Minimum bags per 1000 ft Maximum ft coverage Installed insulation Settled thickness The weight per ft
resistance (R)of: of net area (bags/MSF) per bag (ft ) to be not less than: not to be less of installed insulation to
(in.) than: (in.) be not less than:
h·ft ·°F
(lbs/ft )
Btu
Attic:
A
Sidewalls : R−
A
Optional information for products intended for sidewall application.
C764−19
8.1.1 Thermal resistance, 12.5 WaterVaporSorption—Thewatervaporsorptionofthe
8.1.2 Critical radiant flux, test specimen shall be determined in accordance with Test
8.1.3 Combustion characteristics, Method C1104/C1104M.
8.1.4 Water vapor sorption,
12.6 Odor Emission—Determine the odor emission in ac-
8.1.5 Odor emission,
cordance with Test Method C1304.
8.1.6 Corrosiveness, and
8.1.7 Fungi Resistance.
12.7 Corrosiveness:
12.7.1 Scope—This test method provides a qualitative mea-
8.2 Inspection Requirements—The following requirements
sure of the corrosiveness of mineral fiber insulation by com-
are generally emphasized for purposes of acceptance sampling
parison to a control.
of lots of qualified thermal insulation:
8.2.1 Minimum bag weight, and
12.7.2 Summary of Test Method:
8.2.2 Workmanship.
12.7.2.1 Individually sandwich five each of specially
cleaned steel, copper, and aluminum test plates between pieces
9. Workmanship
of insulation. Hold the insulation uniformly against each side
9.1 Mineral fiber nodulated insulation shall be free of
of the test plate with wire screens and rubber bands.
foreign materials and shall be clean and dry. The insulation
12.7.2.2 Sandwich an equal number of cleaned metal test
shall not have visible defects that will adversely affect the
plates between pieces of washed sterile cotton in an identical
service quality.
manner.
12.7.2.3 Vertically suspend the samples in a humidity test
10. Significance and Use
chamber at 95 6 3 % relative humidity and temperature of 120
10.1 This specification covers products that are used in
6 3°F (49 6 2°C) for time periods determined by the type of
buildings. While products that comply with this specification
metal being tested. Steel is tested for 96 6 2 h. Copper and
are used in various constructions, they are adaptable primarily,
aluminum are tested for 720 65h.
but not exclusively, to wood frame constructions.
12.7.2.4 After the appropriate test period, compare the test
plates exposed to the insulation to the control plates exposed to
11. Sampling and Conditioning
sterile cotton for severity of corrosion. The insulation is
11.1 Sampling of the insulation shall be in accordance with
considered to have passed this test if the corrosion attributed to
PracticeC390.Specificprovisionsforsamplingshallbeagreed
the insulation is not significantly worse than that of the washed
upon between the purchaser and supplier.
sterile cotton controls. The criterion for acceptance is prede-
termined through the use of non-parametric statistics and a
11.2 Condition the test samples in accordance with Practice
90 % confidence level (α = 0.10).
C870.
12.7.3 Significance and Use:
12. Test Methods
12.7.3.1 The fiber composition and the type of binder used
inthemanufactureofmineralfiberinsulationsometimescreate
12.1 Blown Density—Determinetheblowndensityinaccor-
a potential for corrosion on certain metals in the presence of
dance with Guide C1574.
liquid water or water vapor.
12.2 Thermal Resistance—Using samples prepared in ac-
12.7.3.2 This test method is used to determine the relative
cordance with Practice C687 for open application or Practice
corrosion potential of mineral fiber insulation on specific
C1859 for enclosed (behind netting) applications, the thermal
metals under high humidity conditions.
conductivity or thermal conductance shall be determined in
12.7.4 Materials:
accordance with Test Method C518, Test Method C177,or
derived from measurements made by Test Method C1363. The 12.7.4.1 Metal Test Plates, with dimensions of 1 by 4 6 ⁄4
mean temperature shall be 75°F (23.9°C) and the temperature in. (25 by 100 mm). Steel plates shall be 0.02 6 0.005 in. (0.5
difference shall be a minimum of 40°F (22°C). The thermal mm) thick, bright No. 2 finish, cold-rolled low-carbon strip
resistance shall then be calculated from the thermal conduc- steel, quarter hard, temper No. 3.The aluminum plat
...

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.
Designation: C764 − 17 C764 − 19
Standard Specification for
Mineral Fiber Loose-Fill Thermal Insulation
This standard is issued under the fixed designation C764; 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 composition and physical properties of nodulated mineral fiber thermal insulation for use in
attics or enclosed spaces in housing and other framed buildings.
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 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, health, and environmental practices and determine the applicability of
regulatory limitations 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
2.1 ASTM Standards:
B152/B152M Specification for Copper Sheet, Strip, Plate, and Rolled Bar
C168 Terminology Relating to Thermal Insulation
C177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the
Guarded-Hot-Plate Apparatus
C390 Practice for Sampling and Acceptance of Thermal Insulation Lots
C518 Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
C687 Practice for Determination of Thermal Resistance of Loose-Fill Building Insulation
C870 Practice for Conditioning of Thermal Insulating Materials
C1104/C1104M Test Method for Determining the Water Vapor Sorption of Unfaced Mineral Fiber Insulation
C1304 Test Method for Assessing the Odor Emission of Thermal Insulation Materials
C1338 Test Method for Determining Fungi Resistance of Insulation Materials and Facings
C1363 Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus
C1374 Test Method for Determination of Installed Thickness of Pneumatically Applied Loose-Fill Building Insulation
C1574 Guide for Determining Blown Density of Pneumatically Applied Loose-Fill Mineral Fiber Thermal Insulation
C1617 Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from
Thermal Insulation on Aqueous Corrosion of Metals
C1630 Guide for Development of Coverage Charts for Loose-Fill Thermal Building Insulations
C1859 Practice for Determination of Thermal Resistance of Pneumatically Installed Loose-Fill Building Insulation (Behind
Netting) for Enclosed Applications of the Building Thermal Envelope
E136 Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750°C
E970 Test Method for Critical Radiant Flux of Exposed Attic Floor Insulation Using a Radiant Heat Energy Source
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
This specification is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on Blanket and Loose
Fill Insulation.
Current edition approved Sept. 1, 2017Sept. 1, 2019. Published September 2017September 2019. Originally approved in 1973. Last previous edition approved in 20112017
as C764 – 11.C764 – 17. DOI: 10.1520/C0764-17.10.1520/C0764-19.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C764 − 19
3. Terminology
3.1 Definitions—For definitions of terms used in this specification, refer to Terminology C168.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 settled density—The mass per unit volume of a loose-fill insulation after which time or forces, or both, have exerted their
effect upon thickness.
3.2.1.1 Discussion—
The settled density is determined using long term aging studies in attics.
4. Classification
4.1 The nodulated mineral fiber thermal insulation shall be of the following types and classes:
4.1.1 Type I—Pneumatic application.
4.1.2 Type II—Poured application.
5. Ordering Information
5.1 Both types of nodulated mineral fiber thermal insulation are intended for use as thermal insulation in open spaces, such as
attics and enclosed spaces, such as walls, in housing and buildings at ambient temperatures. Type I is used for pneumatic
application (blown or conveyed by an air stream through a hose and discharged over the area to be insulated). Type II is used for
application by pouring in place.
6. Materials and Manufacture
6.1 Basic Material—The basic material shall be fibers made from mineral substances such as rock, slag, or glass processed from
the molten state into an incombustible fibrous form.
6.2 Manufacture—The fibers shall be mechanically processed into nodules, and are permitted to be treated to provide improved
processing and handling characteristics suitable for installation by pouring or pneumatic applications.
7. Physical Properties
7.1 Thermal Characteristics—The standard thermal resistance values normally recommended for open application are
2 2
expressed in °F·h·ft /Btu (K·m /W). Typical values are shown in Table 1. R values others than those listed in Table 1 shall be as
agreed upon between the supplier and the purchaser. The thermal resistance R for the average of any (four) randomly selected
samples shall not be more than 5 % below the mutually agreed upon R value when tested in accordance with 12.2, nor shall any
single specimen be more than 10 % below the mutually agreed upon R value.
7.2 Critical Radiant Flux—Mineral fiber loose fill when tested in accordance with 12.3 shall have a critical radiant flux-flame
2 2
propagation resistance ≥0.12 W/cm (.11 Btu/ft · s).
TABLE 1 Coverage Chart
NOTE 1—Chart is occasionally given in metric units.
R Value at 75°F Mean
Maximum Net Coverage Minimum Thickness Minimum Weight per ft
Temperature
2 2 2
To obtain an insulation Minimum bags per 1000 ft Maximum ft coverage Installed insulation Settled thickness The weight per ft
resistance (R) of: of net area (bags/MSF) per bag (ft ) to be not less than: not to be less of installed insulation to
(in.) than: (in.) be not less than:
h·ft ·°F
(lbs/ft )
Btu
Attic:
A
Sidewalls : R−
A
Optional information for products intended for sidewall application.
C764 − 19
7.3 Combustion Characteristics—Mineral fiber loose fill when tested in accordance with 12.4 shall not have a recorded
temperature rise of more than 54°F (30°C); shall have no flaming after the first 30 s; and, if the specimen weight loss exceeds 50 %
during the test, the recorded temperature of the specimen during the test shall not rise above the furnace air temperature at the
beginning of the test, and there shall be no flaming of the specimen.
7.4 Water Vapor Sorption—The water vapor sorption of the insulation shall not be more than 5 % by weight when tested in
accordance with 12.5.
7.5 Odor Emission—A detectable odor of a strong objectionable nature recorded by more than two of the five panel members
shall constitute rejection of the material when tested in accordance with 12.6.
7.6 Corrosiveness—When tested in accordance with 12.7, the metal plates that are in contact with the insulation shall show no
corrosion greater than the comparative plates that are in contact with sterile cotton that has been tested in the same manner.
7.7 Fungi Resistance—When tested in accordance with 12.9, the insulation shall have growth no greater than that observed on
the white birch tongue depressor comparative material.
8. Other Requirements
8.1 Qualification Requirements—The following requirements are generally emphasized for purposes of initial material product
requirements:
8.1.1 Thermal resistance,
8.1.2 Critical radiant flux,
8.1.3 Combustion characteristics,
8.1.4 Water vapor sorption,
8.1.5 Odor emission,
8.1.6 Corrosiveness, and
8.1.7 Fungi Resistance.
8.2 Inspection Requirements—The following requirements are generally emphasized for purposes of acceptance sampling of
lots of qualified thermal insulation:
8.2.1 Minimum bag weight, and
8.2.2 Workmanship.
9. Workmanship
9.1 Mineral fiber nodulated insulation shall be free of foreign materials and shall be clean and dry. The insulation shall not have
visible defects that will adversely affect the service quality.
10. Significance and Use
10.1 This specification covers products that are used in buildings. While products that comply with this specification are used
in various constructions, they are adaptable primarily, but not exclusively, to wood frame constructions.
11. Sampling and Conditioning
11.1 Sampling of the insulation shall be in accordance with Practice C390. Specific provisions for sampling shall be agreed upon
between the purchaser and supplier.
11.2 Condition the test samples in accordance with Practice C870.
12. Test Methods
12.1 Blown Density—Determine the blown density in accordance with Guide C1574.
12.2 Thermal Resistance—Using samples prepared in accordance with 12.1 andPractice C687 adjusted to the settled density,
thefor open application or Practice C1859 for enclosed (behind netting) applications, the thermal conductivity or thermal
conductance shall be determined in accordance with Test Method C518, Test Method C177, or derived from measurements made
by Test Method C1363. The mean temperature shall be 75°F (23.9°C) and the temperature difference shall be a minimum of 40°F
(22°C). The thermal resistance shall then be calculated from the thermal conductance values using Practice C687. or Practice
C1859 as applicable. See Note 1.
NOTE 1—The thermal resistance is a function of mean temperature. As an option, determine the thermal resistance at additional mean temperatures as
agreed upon by the purchaser and the manufacturer.
12.3 Critical Radiant Flux—The critical radiant flux of the insulation shall be determined in accordance with Test Method E970.
12.4 Behavior of Materials in a Vertical Tube Furnace at 1382°F (750°C)—The behavior of mineral fiber loose-fill insulation
in a vertical tube furnace at 1382°F (750°C) shall be determined in accordance with Test Method E136.
C764 − 19
12.5 Water Vapor Sorption—The water vapor sorption of the test specimen shall be determined in accordance with Test Method
C1104/C1104M.
12.6 Odor Emission—Determine the odor emission in accordance with Test Method C1304.
12.7 Corrosiveness:
12.7.1 Scope—This test method provides a qualitative measure of the corrosiveness of mineral fiber insulation by comparison
to a control.
12.7.2 Summary of Test Method:
12.7.2.1 Individually sandwich five each of specially cleaned steel, copper, and aluminum test plates between pieces of
insulation. Hold the insulation uniformly against each side of the test plate with wire screens and rubber bands.
12.7.2.2 Sandwich an equal number of cleaned metal test plates between pieces of washed sterile cotton in an identical manner.
12.7.2.3 Vertically suspend the samples in a humidity test chamber at 95 6 3 % relative humidity and temperature of 120 6
3°F (49 6 2°C) for time periods determined by the type of metal being tested. Steel is tested for 96 6 2 h. Copper and aluminum
are tested for 720 6 5 h.
12.7.2.4 After the appropriate test period, compare the test plates exposed to the insulation to the control plates exposed to
sterile cotton for severity of corrosion. The insulation is considered to have passed this test if the corrosion attributed to the
insulation is not significantly worse than that of the washed sterile cotton controls. The criterion for accepta
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