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ASTM E3158-18

(Test Method)

Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building

Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building

SIGNIFICANCE AND USE
5.1 This test method does not establish requirements for airtightness but provides means of assessing compliance with specified air-leakage rates established elsewhere.  
5.2 This test method is used to determine the airtightness of building envelopes or portions thereof by measuring the air leakage rate at specified reference pressure differentials.  
5.3 This test method provides:  
5.3.1 Specific directions for determining acceptable weather conditions for conducting the test.  
5.3.2 Two different test boundary preparation conditions; building envelope (9.1.1.1), and operational envelope (9.1.1.2).  
5.3.3 Testing conducted in a range of pressures from 10 Pa (0.04 in. WC) to 100 Pa (0.40 in. WC).  
5.4 A measurement of the air-leakage rate of the constructed building envelope. Test methods that measure the air permeance of materials (Test Method E2178) and air leakage of assemblies (Test Method E2357) alone do not address the various complexities of the constructed building envelope, including but not limited to design, sequence, constructability, workmanship, and the transitions between assemblies.  
5.5 This test method applies to all multizone and large building types and portions or subsections of buildings. It can be used to test envelopes that consist of a single zone or subsections of a zone that can be tested as a single zone. Test envelopes that are entirely composed of subsections separated by interior partitions or floors, or both, may be tested as a single zone by maintaining baseline relationships between these subsections throughout testing. (See Appendix X1. See also Test Methods E779 and E1827.) Isolated subsections, each with its own specified air-leakage rate, shall be treated as separate test envelopes and tested separately. While testing isolated subsections, monitoring must be conducted for any extraneous/flanking air movement between the different zones.  
5.6 The building preparations prior to testing (fenestration positions and pr...
SCOPE
1.1 This standard test method provides a quantitative field-test procedure and calculation method for assessing an air leakage rate using a fan-induced pressure differential(s) across the building envelope, generated by blower doors or equivalent equipment.  
1.2 Building setup conditions in accordance with defining the test boundaries appropriate for testing the envelope’s air leakage are defined in this test method.  
1.3 Procedure to determine the air pressure boundaries of the test envelope to be tested are provided in this test method.  
1.4 This test method applies to all multizone and large building types and portions or subsections thereof.  
1.5 This test method defines three test procedures: multipoint regression, repeated single point, and repeated two-point air leakage rate testing.  
1.6 This test method allows for testing the test envelope in a pressurized condition, a depressurized condition, or in both conditions and averaging the results.  
1.7 This test method applies to an air leakage rate specification with a reference pressure greater than 10 Pa (0.04 in. WC) and not greater than 100 Pa (0.40 in. WC).  
1.8 This test method describes two methods of preparation for the building in order to conduct the test: the building envelope where HVAC-related openings are excluded, and on the operational envelope where the HVAC-related openings are included.  
1.9 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.10 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.  
1.11 This international standard was developed in accordance...

General Information

Status
Published
Publication Date
30-Nov-2018
ICS
91.120.10 - Thermal insulation of buildings
Technical Committee
E06 - Performance of Buildings
Drafting Committee
E06.41 - Air Leakage and Ventilation Performance
Current Stage
Ref Project

Relations

Refers
ASTM E456-13A(2017)e3 - Standard Terminology Relating to Quality and Statistics
Effective Date
01-Oct-2017
Refers
ASTM E779-10(2018) - Standard Test Method for Determining Air Leakage Rate by Fan Pressurization
Effective Date
15-Jul-2018
Refers
ASTM E779-19 - Standard Test Method for Determining Air Leakage Rate by Fan Pressurization
Effective Date
01-Jan-2019
Refers
ASTM E631-15 - Standard Terminology of Building Constructions
Effective Date
01-Mar-2015
Refers
ASTM E631-14 - Standard Terminology of Building Constructions
Effective Date
01-Nov-2014
Refers
ASTM E456-13A(2017)e1 - Standard Terminology Relating to Quality and Statistics
Effective Date
01-Oct-2017
Refers
ASTM E2357-17 - Standard Test Method for Determining Air Leakage of Air Barrier Assemblies
Effective Date
01-Jun-2017
Referred By
ASTM E1258-23 - Standard Test Method for Airflow Calibration of Fan Pressurization Devices
Effective Date
01-Dec-2018
Referred By
ASTM E1827-22 - Standard Test Methods for Determining Airtightness of Buildings Using an Orifice Blower Door
Effective Date
01-Dec-2018

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ASTM E3158-18 - Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone BuildingASTM E3158-18 - Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building
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ASTM E3158-18 - Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building
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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: E3158 − 18
Standard Test Method for
Measuring the Air Leakage Rate of a Large or Multizone
1
Building
This standard is issued under the fixed designation E3158; 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, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This standard test method provides a quantitative field-
1.11 This international standard was developed in accor-
test procedure and calculation method for assessing an air
dance with internationally recognized principles on standard-
leakage rate using a fan-induced pressure differential(s) across
ization established in the Decision on Principles for the
thebuildingenvelope, generated by blower doors orequivalent
Development of International Standards, Guides and Recom-
equipment.
mendations issued by the World Trade Organization Technical
1.2 Building setup conditions in accordance with defining
Barriers to Trade (TBT) Committee.
the test boundaries appropriate for testing the envelope’s air
2. Referenced Documents
leakage are defined in this test method.
2
2.1 ASTM Standards:
1.3 Procedure to determine the air pressure boundaries of
E456 Terminology Relating to Quality and Statistics
the test envelope to be tested are provided in this test method.
E631 Terminology of Building Constructions
1.4 This test method applies to all multizone and large
E779 Test Method for DeterminingAir Leakage Rate by Fan
building types and portions or subsections thereof.
Pressurization
1.5 This test method defines three test procedures: multi-
E1186 Practices for Air Leakage Site Detection in Building
point regression, repeated single point, and repeated two-point
Envelopes and Air Barrier Systems
air leakage rate testing.
E1258 Test Method for Airflow Calibration of Fan Pressur-
ization Devices
1.6 This test method allows for testing the test envelope in
E1827 Test Methods for Determining Airtightness of Build-
a pressurized condition, a depressurized condition, or in both
ings Using an Orifice Blower Door
conditions and averaging the results.
E2178 Test Method forAir Permeance of Building Materials
1.7 This test method applies to an air leakage rate specifi-
E2357 TestMethodforDeterminingAirLeakageRateofAir
cation with a reference pressure greater than 10 Pa (0.04 in.
Barrier Assemblies
WC) and not greater than 100 Pa (0.40 in. WC).
3. Terminology
1.8 This test method describes two methods of preparation
for the building in order to conduct the test: the building
3.1 Definitions:
envelope where HVAC-related openings are excluded, and on
3.1.1 For definitions of general terms related to building
theoperationalenvelopewheretheHVAC-relatedopeningsare
construction used in this test method, refer to Terminology
included.
E631 and for general terms related to accuracy, bias, precision,
and uncertainty, refer to Terminology E456.
1.9 Units—The values stated in SI units are to be regarded
as standard. The values given in parentheses after SI units are
3.2 Definitions of Terms Specific to This Standard:
provided for information only and are not considered standard.
3.2.1 baseline pressure, n—internal test envelope pressure
with the air movement equipment off and sealed, recorded
1.10 This standard does not purport to address all of the
while the building is configured for the test.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.2.2 building envelope, n—defined boundary of the test
sample to determine its air leakage rate excluding the HVAC-
related devices (HVAC devices sealed).
1
This test method is under the jurisdiction of ASTM Committee E06 on
2
Performance of Buildings and is the direct responsibility of Subcommittee E06.41 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
on Air Leakage and Ventilation Performance. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Dec. 1, 2018. Published January 2019. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
E3158–18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E3158 − 18
3.2.3 envelope pressure, n—differential in air pressure 4.2 This test me
...

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Standard Test Method for Determining Air Leakage Rate of Air Barrier Assemblies

SIGNIFICANCE AND USE
5.1 This method is intended to simulate the performance of various air barrier materials/accessories when combined into an assembly. Based upon the results of the measurements, this procedure then assigns an air leakage rating for the air barrier assembly.  
5.2 This method does not purport to establish all criteria necessary for consideration in the selection of an air barrier assembly. The results are intended to be used for comparison purposes and may not represent the field installed performance of the air barrier assembly when installed as part of an air barrier system in a building. However, the results of these tests may be useful in determining the appropriate use of a specified air barrier system assembly.  
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Standard Guide for Characterization and Use of Hygrothermal Models for Moisture Control Design in Building Envelopes

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4.1 This guide is intended to provide the framework for characterizing the functions of the hygrothermal model and the level of sophistication used as inputs for each analysis. Hygrothermal modeling has become an important practice in support of the decision-making design processes involved in moisture management of building envelope systems. Increasingly, hygrothermal models are an integral part of building envelope performance assessment, retrofit, and restoration studies and provide insight in the screening of alternative design approaches affecting water management of the envelope system. Hygrothermal models are used in decision making during the design process of building envelope systems. They may also be used to assess performance of the envelopes of existing buildings, or to predict envelope performance in buildings undergoing retrofit, change in use, restoration or flood remediation. It is, therefore, important to have a methodology to document the model used in a hygrothermal investigation. This documentation provides needed characterization of the hygrothermal model to assess its credibility and suitability. This becomes even more important because of the increasing complexity of the building envelope systems for which new hygrothermal models are being developed. There are many different hygrothermal models available, each with specific capabilities, operational characteristics, and limitations. If modeling is considered for a project, it is important to determine if a hygrothermal model is appropriate for that project, or if a model exists that can perform the simulations required in the project.  
4.2 Quality assurance in a hygrothermal analysis using modeling is achieved by using the most appropriate model with all important transport mechanisms, initial conditions, and boundary conditions. A well-executed quality assurance program in hygrothermal modeling requires systematic and complete documentation of the model and the inputs followed by consisten...
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1.1 This guide offers guidance for the characterization and use of hygrothermal models for moisture control design of building envelopes. In this context, “hygrothermal models” refers to the application of a mathematical model to the solution of a specific heat and moisture flow performance issue or problem. Hygrothermal models are used to predict and evaluate design considerations for the short-term and long-term thermal and moisture performance of building envelopes.  
1.2 Each hygrothermal model has specific capabilities and limitations. Determining the most appropriate hygrothermal model for a particular application requires a thorough analysis of the problem at hand, understanding the required transport processes involved, and available resources to conduct the analysis. Users of this guide can describe the functionality of the hygrothermal model used in an analysis in a consistent manner.  
1.3 This guide applies to hygrothermal models that range from complex research tools to simple design tools. This guide provides a protocol for matching the analysis needs and the capabilities of candidate models.  
1.4 This guide applies to the use of models that include all or part of the following thermal and moisture storage and transport phenomena: (1) heat storage of dry and wet building materials, (2) heat transport by moisture-dependent thermal conduction, (3) phase change phenomena (for example, evaporation and condensation), (4) heat transport by air convection, (5) moisture retention by vapor adsorption and capillary forces, (6) moisture transport by vapor diffusion (molecular and effusion), (7) moisture transport by liquid transport (surface diffusion and capillary flow), and (8) moisture (vapor) transport by air convection.  
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ASTM E1423-21(Practice)
Standard Practice for Determining Steady State Thermal Transmittance of Fenestration Systems

SIGNIFICANCE AND USE
4.1 This practice details the test specimen sizes and test conditions, namely, the room-side and weather-side air temperatures, and the surface heat transfer coefficients for both sides of the test specimen, when testing fenestration products in accordance with Test Method C1199.  
4.2 The thermal transmittance and conductance of a specimen are affected by its size and three-dimensional geometry. Tests should therefore be conducted using the specimen sizes recommended in 5.1. Should the specimen size differ from those given in 5.1, the actual size shall be reported in the test report.  
4.3 Many factors can affect the thermal performance of a fenestration system, including deflections of sealed glazing units. Care should be exercised to maintain the original physical condition of the fenestration system and while installing it in the surround panel.  
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ASTM E3069-19a(Guide)
Standard Guide for Evaluation and Rehabilitation of Mass Masonry Walls for Changes to Thermal and Moisture Properties of the Wall

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4.1 Energy conservation is being addressed more often on existing and historically significant buildings constructed with solid exterior mass masonry walls. Without proper evaluation, changes to the thermal and moisture properties of the exterior walls could have serious negative impacts on the existing masonry, new or existing wall components, and building operations.  
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Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Skylights, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen

SIGNIFICANCE AND USE
5.1 This test method is a standard procedure for determining the air leakage characteristics under specified air pressure differences at ambient conditions.
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1.5 Persons interested in determining air leakage of air barrier assemblies should reference Test Method E2357.  
1.6 Persons using this procedure should be knowledgeable in the areas of fluid mechanics, instrumentation practices, and shall have a general understanding of fenestration products and components.  
1.7 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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ASTM C1859-23(Practice)
Standard Practice for Determination of Thermal Resistance of Pneumatically Installed Loose-Fill Building Insulation (Behind Netting) for Enclosed Applications of the Building Thermal Envelope

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4.1 The thermal resistance, R, of an insulation is used to describe its thermal performance.  
4.2 The thermal resistance of an insulation is related to the density and thickness of the insulation. It is desirable to obtain test data on thermal resistances at thicknesses and densities related to the end uses of the product.  
4.3 In normal use, the thickness of these products range from less than 100 mm (4 in.) to greater than 150 mm (6 in.). Installed densities depend upon the product type, the installed thickness, the installation equipment used, the installation techniques, and the geometry of the insulated space.  
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4.5 When applicable specifications or codes do not specify the nominal thermal resistance level to be used for comparison purposes, a recommended practice is to use the Rsi (metric) = 2.65 m F/Btu]) label density and thickness for that measurement.  
4.6 If the density for test purposes is not available from the coverage chart, a test density shall be established by use of applicable specifications and codes or, if none apply, agreement between the requesting body and the testing organization.  
4.7 Generally, thin sections of these materials are not uniform. Thus, the test thickness must be greater than or equal to the product’s representative thickness if the results are to be consistent and typical of use.
Note 1: The representative thickness is specific for each product and is determined by running a series of tests in which the density is held constant but the thickness is increased. The representative thickness is defined here as that thickness above which there is no more than a 2 % change in the resistivity of the product. The representative thickness is a function of product blown density. In gene...
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1.1 This practice presents a laboratory guide to determine the thermal resistance of pneumatically installed loose-fill building insulations for enclosed applications of the building thermal envelope behind netting at mean temperatures between –10 and 35°C (14 to 95°F).  
1.2 This practice applies to a wide variety of loose-fill thermal insulation products including but not limited to fibrous glass, rock/slag wool, or cellulosic fiber materials and any other insulation material that can be installed pneumatically. It does not apply to products that change their character after installation either by chemical reaction or the application of binders, adhesives or other materials that are not used in the sample preparation described in this practice, nor does it consider the effects of structures, containments, facings, or air films.  
1.3 Since this practice is designed for reproducible product comparison, it measures the thermal resistance of an insulation material which has been preconditioned to a relatively dry state. Consideration of changes of thermal performance of a hygroscopic insulation by sorption of water is beyond the scope of this practice.  
1.4 The sample preparation techniques outlined in this practice do not cover the characterization of loose-fill materials intended for open applications and not intended for spray-applied applications.  
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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.  
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ASTM E3026-23e1(Guide)
Standard Guide for Readily Observable Moisture Affected Materials and Conditions Conducive to Elevated Moisture in Commercial Buildings: Limited Moisture Assessment Process

SIGNIFICANCE AND USE
4.1 Use—This guide is intended for use on a voluntary basis by parties who wish to obtain a limited survey of commercial real estate to assess for readily observable moisture affected materials and physical deficiencies conducive to elevated moisture as part of a commercial real estate transaction or commercial property management. This guide is intended to constitute a limited inquiry using representative observations for the purposes of conducting due diligence regarding the actual and potential presence of readily observable moisture affected materials and physical deficiencies conducive to elevated moisture in connection with the subject property. Inquiries that are more and less comprehensive than this guide (including, in some instances, no inquiry) may be appropriate in some circumstances in the opinion of the user (for example, when the presence of moisture affected materials is known to the user). Furthermore, no implication is intended that a person must use this guide in order to be deemed to have conducted appropriate inquiry in a commercially prudent or reasonable manner in a particular transaction. Nevertheless, this guide is intended to reflect a commercially prudent and reasonable inquiry. However, a LMA is not intended to serve as a comprehensive survey for the presence of readily observable moisture affected materials and physical deficiencies conducive to elevated moisture in all or most of the building systems throughout a commercial building.  
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4.2.2 Site-Specific—This guide is site-specific in that it relates to assessment of readily observable moisture affected materials and physical def...
SCOPE
1.1 Purpose—The purpose of this guide2 is to define good commercial practice for conducting a limited survey for readily observable moisture affected materials and conditions conducive to elevated moisture in a commercial building related to commercial real estate transaction or commercial real estate management by conducting: a walk-through survey, document reviews, and interviews as outlined within this guide. This guide is intended to provide a practical means for the limited identification of moisture affected materials and physical deficiencies conducive to elevated moisture caused by water infiltration through the building envelope or substructure or generated within the subject building as a result of processes or mechanical systems, excluding de minimis conditions. This guide is to allow a user to assess general moisture concerns, as well as the potential need for further assessment or other actions that may be appropriate that are beyond the scope of this guide. For purposes of this guide, the initialism “LMA” or “Limited Moisture Assessment” is used interchangeably with this guide’s full title.  
1.2 Purpose Limitations—While a LMA may be used to survey for readily identifiable moisture affected materials and physical deficiencies conducive to elevated moisture, the LMA is not designed to serve as comprehensive survey for the presence of moisture affected materials and physical deficiencies conducive to elevated moisture in all or most areas in a commercial building. It is not intended to reduce or eliminate the risks that elevated moisture may pose to the subject building or its occupants.  
1.3 Considerations Beyond This Scope—The use of this guide is limited to the scope set forth in this section. Section 12 of this guide identifies, for informational purposes, certain physical conditions (not an all-inclusive list) that may exist at a subject property and certain activities or procedures (not an all-inclu...

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ASTM
ASTM C1594-23(Specification)
Standard Specification for Polyimide Rigid Cellular Thermal Insulation

ABSTRACT
This specification establishes the composition and physical properties of rigid polyimide cellular foams intended for use as thermal and sound-isolating insulation in commercial and industrial environments. The polyimide insulations covered are classified into three types (Types I, II, and III) according to closed cell content, and into four grades (Grades 1, 2, 3, and 4) according to density. Type II insulation is further divided into two classes (Classes 1 and 2) according to upper temperature limits. Materials shall be manufactured from the appropriate monomers and necessary ingredients. Specimens shall be sampled, tested, and conform accordingly to the following physical property requirements: apparent thermal conductivity; water and gas permeability; density; percent closed cell; upper temperature limit; high temperature stability; compressive strength; compressive force deflection; water vapor transmission; steam aging characteristics (tensile strength, dimensional and weight changes), corrosiveness; chemical resistance; vertical burn characteristics (flame application and time, burn length, and dripping); specific optical smoke density for both flaming and non-flaming exposures; toxic smoke generation; surface burning characteristics (flame spread and smoke developed indices); combustion by-products (carbon monoxide, hydrogen fluoride, hydrogen chloride, nitrogen oxides, sulfur dioxide, and hydrogen cyanide); oxygen index, and 14 scale room burn.
SCOPE
1.1 This specification covers the composition and physical properties of polyimide foam insulation with nominal densities from 1.0 lb/ft3 to 8.0 lb/ft3 (16 kg/m3 to 128 kg/m3) and intended for use as thermal and sound-isolating insulation for temperatures from −423°F to +600°F (−253°C to +316°C) in commercial and industrial environments.  
1.1.1 The annex shall apply to this specification for marine applications.  
1.1.2 This standard is designed as a material specification and not a design document.  
1.1.3 The values stated in Table 1 and Table 2 are not to be used as design values. It is the buyer’s responsibility to specify design requirements and obtain supporting documentation from the material supplier.  
* = Not available consult manufacturer for additional information.
NA = Not Applicable
NB = A manufacturer can only claim conformance to this standard to the values reported in this table. The * notes are confidential data to the manufacturers and as such are not considered part of any qualifying requirements for the standard and only tell the user to inquire about that data.  
* = Not available consult manufacturer for additional information.
NA = Not Applicable
NB = A manufacturer can only claim conformance to this standard to the values reported in this table. The * notes are confidential data to the manufacturers and as such are not considered part of any qualifying requirements for the standard and only tell the user to inquire about that data.
Note 1: The subject matter of this material specification is not covered by any other ASTM specification. There is no known ISO standard covering the subject of this standard.  
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 B...

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  • Technical specification
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ASTM
ASTM C1058/C1058M-10(2023)(Practice)
Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation

SIGNIFICANCE AND USE
4.1 The various methods for measuring and calculating thermal properties provide data and information for manufacturer's published information, for comparison of related products, and for designers and users to evaluate insulation products for particular applications. For these purposes it is advisable to provide basic data and information produced under standard temperature conditions.  
4.2 It is possible that thermal properties of a specimen will change with mean temperature, with temperature difference across the specimens, and with high temperature exposure. Data and information at standard temperatures are necessary for valid comparison of thermal properties.  
4.3 The mean test temperatures to measure thermal properties shall be selected from those listed in Table 1. It is recommended that thermal properties of insulation materials be evaluated over a mean temperature range that represents the intended end use. For this situation, the lowest and greatest mean temperatures need to be within 10°C of the maximum and minimum mean temperature of interest. The temperature differences for any chosen mean temperature will depend upon both the thermal insulation application (see appropriate materials specification), the method of evaluation, and the limitations of the apparatus. Temperature differences or relevant temperature conditions required by ASTM material specifications shall take precedence over those recommended in this practice. (A) The values in degrees Fahrenheit given in this table are not intended to be exact conversions of those values in degrees Celsius.  
4.3.1 Standard conditions are presented where both surfaces are exposed to fixed ambient temperatures that are typical for testing building constructions, both insulated and uninsulated (Table 2). (A) Thermal transmission properties of panels of various building constructions are thermal transmittance (U), and thermal conductance (C).(B) Celsius temperatures are standard. The values in degrees Fa...
SCOPE
1.1 This practice covers standard mean temperatures for reporting thermal properties of thermal insulations, products, and materials, and of related systems and components, both insulated and uninsulated.  
1.2 Thermal properties shall be determined as a function of temperature by standard test methods. (Test Methods C177, C201, C335/C335M, C518, C745, C1114, C1363, Guide C653, and Practice C687, all in combination with Practice C1045.)  
Note 1: Standard referenced materials are needed to span the temperature range of the tests.  
1.3 This practice recommends standard conditions for use in testing and evaluating thermal properties as a function of temperature by standard test methods.  
1.4 General applications of thermal insulations include:  
1.4.1 Building envelopes,  
1.4.2 Mechanical systems or processes, and  
1.4.3 Building and industrial insulations.  
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
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.  
1.7 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.

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