ISO 29471:2008
(Main)Thermal insulating products for building applications - Determination of dimensional stability under constant normal laboratory conditions (23 degrees C/50 % relative humidity)
Thermal insulating products for building applications - Determination of dimensional stability under constant normal laboratory conditions (23 degrees C/50 % relative humidity)
ISO 29471:2008 specifies the equipment and procedures to evaluate irreversible dimensional changes of test specimens and full-size products with time under constant normal laboratory conditions. ISO 29471:2008 is applicable to thermal insulating products.
Produits isolants thermiques destinés aux applications du bâtiment — Détermination de la stabilité dimensionnelle dans des conditions de laboratoire constantes et normales (23 degrés C/50 % d'humidité relative)
General Information
- Status
- Published
- Publication Date
- 28-Oct-2008
- Technical Committee
- ISO/TC 163/SC 1 - Test and measurement methods
- Drafting Committee
- ISO/TC 163/SC 1 - Test and measurement methods
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 11-Jun-2025
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 07-Aug-2021
Overview
ISO 29471:2008 establishes a standardized test method for assessing dimensional stability of thermal insulating products used in building applications under constant normal laboratory conditions (23 °C / 50 % relative humidity). The standard specifies the equipment, specimen preparation, conditioning and measurement procedures to evaluate irreversible changes in length, width and flatness of full-size products and test specimens over time.
Keywords: ISO 29471:2008, dimensional stability, thermal insulating products, 23°C/50% RH, thermal insulation testing, building applications.
Key topics and requirements
- Scope and purpose: Evaluates irreversible dimensional changes of thermal insulation materials and products subjected to normal laboratory conditions.
- Test atmosphere: Normal laboratory conditions defined as (23 ± 2) °C and (50 ± 5) % RH. Alternative tropical conditioning (27 °C / 65 % RH) may be stated in reports where relevant.
- Measurement methods: Three permitted methods:
- Method A - linear dimensions of full-size products (use when total permitted change Δε ≥ 1 %).
- Method B - linear dimensions on specimens smaller than full size; two variants (B1 using metal plates + dial gauge, B2 using metal wire and optical/electrical device). Use when 0.1 % < Δε < 1 %.
- Method C - deviation from flatness for full-size products (requires 0.5 mm accuracy).
- Specimen sizes and number: Thickness must equal original product thickness. Specimen area requirements: B1 typically 500 × 500 mm (min >250 × 250 mm), B2 250 × 250 mm. At least three specimens when not testing full-size products.
- Conditioning and timing: Condition specimens ≥ 24 h before testing. Measure initial dimensions and then at standard intervals (minimum total duration 28 days with measurements at 28-day intervals). Optional additional readings at 1, 3, 7 and 14 days for finer curves. Continue until dimensional change between last two readings < 10 % of permitted total Δε.
- Accuracy and expression of results: Changes expressed as percentage for length/width and mm/m for flatness. Measuring equipment accuracy must be at least Δε/10. Repeatability ~0.4 % and reproducibility ~0.7 % (from round-robin data).
- Test report content: Must include reference to ISO 29471, product ID, pre-test history, conditioning, test method used, individual and mean results, and any deviations.
Applications
- Quality control and incoming inspection of thermal insulation boards, slabs and panels
- Product development and R&D to quantify shrinkage, swelling or warping under standard conditions
- Compliance testing for product standards, certification and regulatory documentation
- Comparative performance testing for procurement and specifications in the construction industry
Who uses this standard
- Test laboratories and certification bodies
- Manufacturers and suppliers of thermal insulating products
- Product engineers, R&D teams and quality managers in the building materials sector
- Specifiers, façade and building-envelope consultants, and procurement teams
Related standards
- ISO 29465 (length and width measurement)
- ISO 29468 (flatness measurement)
- ISO 29472, ISO 29466 and other ISO documents on thermal insulating products listed in the ISO 29471:2008 introduction
This summary helps manufacturers, test labs and building professionals apply ISO 29471:2008 for reliable dimensional stability testing of thermal insulation under standardized laboratory conditions.
Frequently Asked Questions
ISO 29471:2008 is a standard published by the International Organization for Standardization (ISO). Its full title is "Thermal insulating products for building applications - Determination of dimensional stability under constant normal laboratory conditions (23 degrees C/50 % relative humidity)". This standard covers: ISO 29471:2008 specifies the equipment and procedures to evaluate irreversible dimensional changes of test specimens and full-size products with time under constant normal laboratory conditions. ISO 29471:2008 is applicable to thermal insulating products.
ISO 29471:2008 specifies the equipment and procedures to evaluate irreversible dimensional changes of test specimens and full-size products with time under constant normal laboratory conditions. ISO 29471:2008 is applicable to thermal insulating products.
ISO 29471:2008 is classified under the following ICS (International Classification for Standards) categories: 91.100.60 - Thermal and sound insulating materials. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 29471:2008 has the following relationships with other standards: It is inter standard links to ISO 29471:2008/Amd 1:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 29471:2008 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 29471
First edition
2008-11-01
Thermal insulating products for building
applications — Determination of
dimensional stability under constant
normal laboratory conditions
(23 °C/50 % relative humidity)
Produits isolants thermiques destinés aux applications du bâtiment —
Détermination de la stabilité dimensionnelle dans des conditions de
laboratoire constantes et normales (23 °C/50 % d'humidité relative)
Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 2
5 Apparatus . 2
6 Test specimens . 4
7 Procedure . 5
8 Calculation and expression of results. 6
9 Accuracy of measurement. 6
10 Test report . 7
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 29471 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 1, Test and measurement methods.
iv © ISO 2008 – All rights reserved
Introduction
This International Standard comprises the original EN 1603:1996 and EN 1603:1996/AC:1997 prepared by
Technical Committee CEN/TC 88, Thermal insulating materials and products, which have been amended by
ISO/TC 163/SC 1 with reference to conditioning and testing conditions in tropical countries.
This International Standard is one of a series of documents specifying test methods, based on existing
European Standards, that are being adopted by ISO. This “package” of standards includes the following group
of interrelated documents.
International Standard Respective EN
standard
ISO 29465, Thermal insulating products for building applications — Determination of length EN 822
and width
ISO 29466, Thermal insulating products for building applications — Determination of EN 823
thickness
ISO 29467, Thermal insulating products for building applications — Determination of EN 824
squareness
ISO 29468, Thermal insulating products for building applications — Determination of flatness EN 825
ISO 29469, Thermal insulating products for building applications — Determination of EN 826
compression behaviour
ISO 29470, Thermal insulating products for building applications — Determination of the EN 1602
apparent density
ISO 29471, Thermal insulating products for building applications — Determination of EN 1603
dimensional stability under constant normal laboratory conditions (23°C/50 % relative
humidity)
ISO 29472, Thermal insulating products for building applications — Determination of EN 1604
dimensional stability under specified temperature and humidity conditions
ISO 29764, Thermal insulating products for building applications — Determination of EN 1605
deformation under specified compressive load and temperature conditions
ISO 29765, Thermal insulating products for building applications — Determination of tensile EN 1607
strength perpendicular to faces
ISO 29766, Thermal insulating products for building applications — Determination of tensile EN 1608
strength parallel to faces
ISO 29767, Thermal insulating products for building applications — Determination of EN 1609
short-term water absorption by partial immersion
ISO 29768, Thermal insulating products for building applications — Determination of linear EN 12085
dimensions of test specimens
ISO 29769, Thermal insulating products for building applications — Determination of EN 12430
behaviour under point load
ISO 29770, Thermal insulating products for building applications — Determination of EN 12431
thickness for floating-floor insulating products
ISO 29771, Thermal insulating materials for building applications — Determination of organic EN 13820
content
ISO 29803, Thermal insulation products for building applications — Determination of the EN 13497
resistance to impact of external thermal insulation composite systems (ETICS)
ISO 29804, Thermal insulation products for building applications — Determination of the EN 13494
tensile bond strength of the adhesive and of the base coat to the thermal insulation material
ISO 29805, Thermal insulation products for building applications — Determination of the EN 13496
mechanical properties of glass fibre meshes
vi © ISO 2008 – All rights reserved
INTERNATIONAL STANDARD ISO 29471:2008(E)
Thermal insulating products for building applications —
Determination of dimensional stability under constant normal
laboratory conditions (23 °C/50 % relative humidity)
1 Scope
This International Standard specifies the equipment and procedures to evaluate irreversible dimensional
changes of test specimens and full-size products with time under constant normal laboratory conditions. It is
applicable to thermal insulating products.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any a
...
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