ASTM C1321-15(2020)

Standard Practice for Installation and Use of Interior Radiation Control Coating Systems (IRCCS) in Building Construction

SIGNIFICANCE AND USE
4.1 This practice recognizes that effectiveness, safety, and durability of an IRCCS depends not only on the quality of the materials, but also on the proper installation.  
4.2 Improper installation of an IRCCS will reduce its thermal effectiveness, cause fire risks and other unsafe conditions, and promote deterioration of the structure in which it is installed. Improper installation has the potential to create specific hazards that include: heat buildup in recessed lighting fixtures, deterioration of failure of electrical wiring components, and deterioration of wood structures and paint failure due to moisture accumulation.  
4.3 This practice provides directions for the installation of IRCCS materials in a safe and effective manner. Actual conditions in existing buildings will vary greatly.  
4.4 The user shall consult the manufacturer for application and installation methods.
SCOPE
1.1 This practice has been prepared for use by the designer, specifier, and applicator of Interior Radiation Control Coating Systems (IRCCS) for use in building construction. The scope contains instructions related to the use and installation of IRCCS that are sprayed, rolled, or brush applied. Examples that this practice is intended to address include: (1) low emittance surfaces in vented building envelope cavities intended to retard radiant transfer across the vented airspace; (2) low emittance surfaces at interior building surfaces intended to retard radiant transfer to or from building inhabitants; and (3) low emittance surfaces at interior building surfaces intended to reduce radiant transfer to or from heating or cooling systems.  
FIG. 1 Typical Residential Use  
Note 1: Apply IRCCS to cover the exposed roof deck area including support structure directly connected to the roof deck (such as purlins, rafters, and top chord of the trusses). The low-emittance surface of the IRCCS must face the interior of the attic.
FIG. 2 Typical Industrial, Commercial, and Agricultural Use  
Note 1: Apply the IRCCS to cover the entire interior surface area. The low-emittance surface of the IRCCS must face the interior of the building.  
1.2 This practice covers the installation process from pre-installation inspection through post-installation. It does not cover the production of the Interior Radiation Control Coating Materials.  
1.3 This practice is not intended to replace the manufacturer's installation instructions, but it shall be used in conjunction with such instructions. This practice is not intended to supersede local, state, or federal codes.  
1.4 This practice assumes that the installer possesses a good working knowledge of the application codes and regulations, safety practices, tools, equipment, and methods necessary for the installation of Interior Coating Materials. It also assumes that the installer understands the fundamentals of building construction that affect the installation of an IRCCS.  
1.5 When the installation or use of Interior Radiation Control Coating Materials, accessories, and systems pose safety or health problems, the manufacturer shall provide the user appropriate current information regarding any known problems associated with the intended use of the products and shall also provide direction on protective measures to be employed for safe utilization. The user shall establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.  
1.6 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. Specific precautionary statements are contained in Sections 5 and 7.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization...

General Information

• Status: Published
• Publication Date: 29-Feb-2020
• ICS: 91.120.10 - Thermal insulation of buildings
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.21 - Reflective Insulation

Relations

• Replaces: ASTM C1321-15 - Standard Practice for Installation and Use of Interior Radiation Control Coating Systems (IRCCS) in Building Construction
• Effective Date: 01-Mar-2020
• Refers: ASTM C168-24 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2024
• Refers: ASTM E96/E96M-24 - Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
• Effective Date: 01-Mar-2024
• Refers: ASTM E84-23d - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Dec-2023
• Refers: ASTM E96/E96M-23 - Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
• Effective Date: 15-Nov-2023
• Refers: ASTM E84-23c - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Sep-2023
• Refers: ASTM E84-19b - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Jul-2019
• Refers: ASTM E84-19a - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 15-Apr-2019
• Refers: ASTM E84-19 - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Mar-2019
• Refers: ASTM E84-18b - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Oct-2018
• Refers: ASTM E84-18a - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Jul-2018
• Refers: ASTM C168-18 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2018
• Refers: ASTM E84-18 - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Mar-2018
• Refers: ASTM E84-17a - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Nov-2017
• Refers: ASTM E84-17 - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Aug-2017

Overview

ASTM C1321-15(2020) is the recognized standard practice for the installation and use of Interior Radiation Control Coating Systems (IRCCS) in building construction. Developed by ASTM International, this standard provides the framework to ensure that IRCCS materials are applied safely and effectively, improving energy performance by retarding radiant heat transfer inside buildings. The standard is essential for designers, specifiers, and applicators of thermal insulation coatings, particularly those seeking to control radiant heat within conditioned or unconditioned spaces.

Proper installation of IRCCS is crucial not only for maximizing thermal effectiveness but also for maintaining building safety and durability. This document covers best practices for applying IRCCS-such as spray, roll, or brush methods-as well as pre-installation inspection, health and safety considerations, and post-installation requirements.

Key Topics

• Installation Best Practices:

  • Importance of following both manufacturer instructions and ASTM C1321 guidelines
  • The necessity of pre-installation inspection, including checks for moisture problems, electrical issues, and sufficient ventilation
  • Step-by-step installation process, from surface preparation to post-installation certification

• Safety and Performance:

  • Risks associated with improper installation, including reduced insulation effectiveness, potential fire hazards, and structural deterioration
  • Ensuring ventilation remains unblocked, especially in attics and vented cavities
  • The impact of IRCCS placement on recessed lighting, electrical wiring, and airflow

• Material Considerations:

  • Only apply IRCCS to clean, appropriate surfaces using compatible methods and tools
  • Maintain the low-emittance surface facing the interior of the space for optimal radiant barrier performance
  • Avoid direct contact with corrosive materials and ensure surfaces are free from contaminants before application

• Compliance:

  • IRCCS installation does not supersede local, state, or federal building codes-compliance with all applicable regulations is mandatory
  • Installers must be knowledgeable in construction safety, the use of appropriate tools, and relevant regulatory requirements

Applications

• Residential Buildings:

  • IRCCS is commonly applied to attics, roof decks, and supporting structures such as purlins and rafters to reduce radiant heat transfer, enhancing energy efficiency and comfort

• Commercial, Industrial, and Agricultural Structures:

  • Used to cover entire interior surface areas, effectively controlling heat flow and improving HVAC system efficiency

• Specific Scenarios:

  • Ideal for building envelope cavities where radiant heat needs to be retarded across vented airspace
  • Suitable for interior surfaces that interface with heating and cooling systems or where the aim is to protect inhabitants from unnecessary heat gain or loss

Related Standards

• ASTM C168: Terminology Relating to Thermal Insulation
• ASTM C1371: Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers
• ASTM E84: Test Method for Surface Burning Characteristics of Building Materials
• ASTM E96/E96M: Test Methods for Water Vapor Transmission of Materials
• NFPA 54: National Fuel Gas Code
• NFPA 211: Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances
• CPSC Guide to Home Wiring Hazards

For optimal results and safety, ASTM C1321-15(2020) should be used in conjunction with manufacturer guidelines and other relevant ASTM and NFPA standards. Proper adherence to this standard ensures the long-term performance, safety, and efficiency of building insulation using interior radiation control coating systems.

Keywords: Interior Radiation Control Coating Systems, IRCCS, radiant barrier, building insulation, ASTM C1321, thermal insulation, standard installation practices, building safety, energy efficiency.

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: C1321 − 15 (Reapproved 2020)
Standard Practice for
Installation and Use of Interior Radiation Control Coating
Systems (IRCCS) in Building Construction
This standard is issued under the fixed designation C1321; 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.
1. Scope priate safety and health practices and determine the applicabil-
ity of regulatory requirements prior to use.
1.1 This practice has been prepared for use by the designer,
1.6 This standard does not purport to address all of the
specifier, and applicator of Interior Radiation Control Coating
safety concerns, if any, associated with its use. It is the
Systems (IRCCS) for use in building construction. The scope
responsibility of the user of this standard to establish appro-
contains instructions related to the use and installation of
priate safety, health, and environmental practices and deter-
IRCCS that are sprayed, rolled, or brush applied. Examples
mine the applicability of regulatory limitations prior to use.
that this practice is intended to address include: (1) low
Specific precautionary statements are contained in Sections 5
emittance surfaces in vented building envelope cavities in-
and 7.
tended to retard radiant transfer across the vented airspace; (2)
1.7 This international standard was developed in accor-
low emittance surfaces at interior building surfaces intended to
dance with internationally recognized principles on standard-
retard radiant transfer to or from building inhabitants; and (3)
ization established in the Decision on Principles for the
low emittance surfaces at interior building surfaces intended to
Development of International Standards, Guides and Recom-
reduce radiant transfer to or from heating or cooling systems.
mendations issued by the World Trade Organization Technical
1.2 This practice covers the installation process from pre-
Barriers to Trade (TBT) Committee.
installation inspection through post-installation. It does not
cover the production of the Interior Radiation Control Coating
2. Referenced Documents
Materials.
2.1 ASTM Standards:
1.3 This practice is not intended to replace the manufactur-
C168 Terminology Relating to Thermal Insulation
er’s installation instructions, but it shall be used in conjunction
C1371 Test Method for Determination of Emittance of
with such instructions. This practice is not intended to super-
Materials Near Room Temperature Using Portable Emis-
sede local, state, or federal codes.
someters
E84 Test Method for Surface Burning Characteristics of
1.4 This practice assumes that the installer possesses a good
Building Materials
working knowledge of the application codes and regulations,
E96/E96M Test Methods for Water Vapor Transmission of
safety practices, tools, equipment, and methods necessary for
Materials
the installation of Interior Coating Materials. It also assumes
2.2 NFPA Standards:
that the installer understands the fundamentals of building
NFPA 54 National Fuel Gas Code
construction that affect the installation of an IRCCS.
NFPA 211 Standard for Chimneys, Fireplaces, Vents, and
1.5 When the installation or use of Interior Radiation
Solid Fuel-Burning Appliances
Control Coating Materials, accessories, and systems pose
2.3 Other Documents:
safety or health problems, the manufacturer shall provide the
CPSC Guide to Home Wiring Hazards
user appropriate current information regarding any known
problems associated with the intended use of the products and 3. Terminology
shall also provide direction on protective measures to be
3.1 Definitions—For definitions of terms used in this
employed for safe utilization. The user shall establish appro-
practice, refer to Terminology C168.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
This practice is under the jurisdiction of ASTM Committee C16 on Thermal contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Insulation and is the direct responsibility of Subcommittee C16.21 on Reflective Standards volume information, refer to the standard’s Document Summary page on
Insulation. the ASTM website.
Current edition approved March 1, 2020. Published March 2020. Originally Available from National Fire Protection Association (NFPA), 1 Batterymarch
approved in 1996. Last previous edition approved in 2015 as C1321 – 15. DOI: Park, Quincy, MA 02169-7471, http://www.nfpa.org.
10.1520/C1321-15R20. Available from Consumer Product Safety Commission, https://www.cpsc.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1321 − 15 (2020)
specific hazards that include: heat buildup in recessed lighting
fixtures, deterioration of failure of electrical wiring
components, and deterioration of wood structures and paint
failure due to moisture accumulation.
4.3 This practice provides directions for the installation of
IRCCS materials in a safe and effective manner. Actual
conditions in existing buildings will vary greatly.
4.4 The user shall consult the manufacturer for application
and installation methods.
NOTE 1—Apply IRCCS to cover the exposed roof deck area including
support structure directly connected to the roof deck (such as purlins,
5. Safety Precautions
rafters, and top chord of the trusses). The low-emittance surface of the
5.1 The applicator shall meet all of the requirements of the
IRCCS must face the interior of the attic.
FIG. 1 Typical Residential Use manufacturer, code, and their contract for safety.
5.2 Ventilation shall be provided to ensure that mist and
overspray are immediately dispersed from the application area.
When natural ventilation is not adequate, place OSHA ap-
proved fans in windows or doors adjacent to the application
area to improve ventilation. Warnings shall be provided for
areas where ventilation is exhausted.Ventilation of the areas of
application shall meet all of the requirements of the
manufacturer, code, and the installation contract.
NOTE1—ApplytheIRCCStocovertheentireinteriorsurfacearea.The
5.3 The instructions provided by the manufacturer shall be
low-emittance surface of the IRCCS must face the interior of the building.
consulted for all applicable handling and safety requirements.
FIG. 2 Typical Industrial, Commercial, and Agricultural Use
6. Pre-Installation Inspection and Preparation
3.2 Definitions of Terms Specific to This Standard:
6.1 Inspections:
3.2.1 applicator—the person or persons who apply interior
6.1.1 Inspect the roof, walls, ceilings, and floors to identify
reflective coating materials in buildin
...