ISO 8144-1

ISO/FDIS 8144-1:2025(en)
ISO/TC 163/SC 03/WG 19 3
Date: 2025-08-26
Secretariat: SCC
Date:
Thermal insulation – — Mineral wool mats for ventilated spaces – —
Part 1:
Specification for applications with restricted ventilation
Isolation thermique – Feutres en laine minérale pour espaces ventilés – Partie 1: Spécifications pour application
dans des conditions de ventilation restreinte
FDIS stage
ISO/FDIS 8144-1:2025(en)
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ii
ISO/FDIS 8144-1:2025(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Sampling and conformity control . 2
5 Required properties . 2
5.1 Dimensions . 2
5.2 Fire behaviour . 3
5.3 Thermal resistance and thermal conductivity . 3
5.4 Handling properties . 4
5.5 General properties . 4
6 Marking . 4
7 Test report . 5
Annex A (normative) Determination of handling properties of mats (batts or rolls) . 7
Annex B (normative) Determination of the declared values of thermal resistance and thermal
conductivity . 11
Bibliography . 14

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ISO/FDIS 8144-1:2025(en)
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
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 3, Thermal insulation products, components and systems.
This second edition cancels and replaces the first edition (ISO 8144-1:1995), which has been technically
revised.
The main changes are as follows:
— — reference added to dimensional testing;
— — revision of testing procedure for thermal conductivity and thermal resistance.
A list of all parts in the ISO 8144 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/FDIS 8144-1:2025(en)
Thermal insulation – — Mineral wool mats for ventilated spaces – —
Part 1:
Specification for applications with restricted ventilation
1 Scope
This document specifies the properties and acceptable tolerances for bonded man-made mineral wool thermal
insulating mats (batts and rolls). The mats specified in this document are for use within ventilated spaces of
buildings where the essential ventilation of the space can be restricted if the thickness recovery of the
insulation is excessive. See ISO 9774:2004, Figure 1, for typical locations. They can be supplied flat, folded, or
in the form of a roll.
TheThis document specifies the properties to be declared by the manufacturer at the time of delivery are
specified, as arewell as some test methods for the determination of these properties. Essentially, mats do not
change their properties and are dimensionally stable for the temperature and humidity conditions within a
ventilated space.
This document provides limiting values for most of the properties. These limiting values are for specification
purposes only; design values can be derived from these by considering the environmental factors affecting the
thermal performance of the product, the influence of the product properties on installation, and the effect of
workmanship on the thermal performance. For converting declared R- or λ-values to design values, see ISO
10456.
Mats can be supplied with a factory-applied facing, but facings are not covered by this document.
In general, Because mats are not generally designed to support any applied load. For this reason, only the
mechanical properties required for adequate handling during application are specified.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 7345, Thermal performance of buildings and building components — Physical quantities and definitions
ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties — Heat
flow meter apparatus
ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Guarded hot plate apparatus
ISO 9229, Thermal insulation — Vocabulary
ISO 12491, Statistical methods for quality control of building materials and components
ISO 12576--1, Thermal insulation — Insulating materials and products for buildings — Conformity control
systems — Part 1: Factory-made products
ISO 29465, Thermal insulating products for building applications — Determination of length and width
ISO 29466, Thermal insulating products for building applications — Determination of thickness
ISO/FDIS 8144-1:2025(en)
ISO 29467, Thermal insulating products for building applications — Determination of squareness
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9229 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
mineral wool
MW
Fibrousfibrous thermal insulation material manufactured from molten rock, slag, or glass.
3.2 3.2
mat
Flexibleflexible fibrous insulation supplied in the form of rolls or batts, which may be faced but not enclosed.
3.3 3.4
batt
Portionportion of an insulation mat in the form of a rectangular piece, between 1 m and 3 m in length and
supplied flat or folded.
3.4 3.4
roll
Insulationinsulation product supplied in the form of a wound cylinder.
4 Sampling and conformity control
Conformity control shall be in accordance with ISO 12576-1. Manufacturer shall declare which option they
have chosen.
Essentially, mats do not change their properties and are dimensionally stable for the temperature and
humidity conditions within a ventilated space.
Design values can be derived from the limiting values provided by this document by considering the
environmental factors affecting the thermal performance of the product, the influence of the product
properties on installation, and the effect of workmanship on the thermal performance. For converting
declared R- or λ-values to design values, see ISO 10456.
5 Required properties
5.1 Dimensions
The manufacturer shall declare the nominal length, width, and thickness of the mats.
These dimensions shall be measured in accordance with ISO 29465 (length and width), ISO 29466 (thickness)
and ISO 29467 (squareness) and shall be subject to the tolerance classes detailed in Table 1Table 1.
ISO/FDIS 8144-1:2025(en)
5.2 Fire behaviour
The fire behaviour of the insulation materials, including any facings, shall be declared in compliance to the fire
regulations and codes that apply in the locality in which they are applied.
Table 1 — Dimensional tolerances
Dimension Permissible deviations of Tolerance Tolerance Tolerance Test method
measured values from Class A Class B Class C
nominal dimensions
Length, l - 2 %, + excess permitted on  ISO 29465
average of measured values
for each single specimen
Width, b ±1,5 % or ±10 mm,  ISO 29465
whichever is less, on average
of measured values for each
single specimen
Thickness, d For any single specimen, the -5 % or -5 mm -3 % or -3 mm -3 % or -3 mm ISO 29466
measured thickness at each whichever whichever whichever
individual measuring point gives the gives the gives the
shall not deviate by more greatest greatest greatest
than 10 mm from the mean numerical numerical numerical
of measurements on that tolerance tolerance tolerance
specimen. Refer to Tolerance
+15 % or +10 % or +5 % or
Classes.
+15 mm +10 mm +5 mm
whichever whichever whichever
gives the gives the gives the
smallest smallest smallest
numerical numerical numerical
tolerance tolerance tolerance
Squareness of For each 1 m along the ISO 29467
batts (rolls shortest face dimension, the
5 mm/m
need not be maximum deviation shall not
tested) be more than 5 mm
5.3 Thermal resistance and thermal conductivity
The thermal transmission properties of a product shall be declared by the manufacturer as either thermal
resistance, R , or thermal conductivity, λ in accordance with ISO 7345. The mean test temperature shall also
D D
be declared.
Thermal resistance and thermal conductivity shall be based upon measurements carried out and
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