ISO 8145:2026

International
Standard
ISO 8145
Second edition
Thermal insulation — Mineral wool
2026-01
board for overdeck insulation of
roofs — Specification
Isolation thermique — Panneaux rigides en laine minérale pour
l'isolation par l'extérieur des toitures-terrasses — Spécifications
Reference number
© ISO 2026
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Published in Switzerland
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Contents Page
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 transmission properties .3
5.4 Deformation resistance .3
5.5 Interlaminar strength .3
5.6 Breaking load .3
5.7 General properties .4
6 Marking . . 4
7 Test report . 4
Annex A (normative) Determination of breaking load . 6
Annex B (normative) Determination of the declared values of thermal resistance and thermal
conductivity . 8
Bibliography .11

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Foreword
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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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rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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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 8145:1994), which has been technically
revised.
The main changes are as follows:
— included reference to dimensional testing;
— revised testing procedure for thermal conductivity and thermal resistance.
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
International Standard ISO 8145:2026(en)
Thermal insulation — Mineral wool board for overdeck
insulation of roofs — Specification
1 Scope
This document specifies the properties and acceptable tolerances for bonded human-made mineral wool
thermal insulating board for the overdeck insulation of roofs of buildings. The product is intended for roofs
carrying foot traffic by maintenance personnel only.
This document specifies the properties to be declared by the manufacturer at the time of delivery, as well as
some test methods for the determination of these properties.
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.
This document applies to board with or without a membrane for the insulation of the upper surface of roofs
under roofing systems protected against water. The properties of a facing membrane are not described.
When the board is supplied with a facing membrane, it is not intended to be waterproof.
The board specified in this document is intended to be fixed to the roof surface.
2 Normative references
The following documents are referred to in the text in such a way that some or all 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 29467, Thermal insulating products for building applications — Determination of squareness
ISO 29468, Thermal insulating products for building applications — Determination of flatness
ISO 29764, Thermal insulating products for building applications — Determination of deformation under
specified compressive load and temperature conditions

ISO 29765, Thermal insulating products for building applications — Determination of tensile strength
perpendicular to faces
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
mineral wool
fibrous thermal insulation material manufactured from molten rock, slag, or glass
3.2
board
rigid or semi-rigid thermal insulation product of rectangular shape and cross-section in which the thickness
is uniform and substantially smaller than the other dimensions
4 Sampling and conformity control
Conformity control shall be in accordance with ISO 12576-1. Manufacturer shall declare which option they
have chosen.
5 Required Properties
5.1 Dimensions
The manufacturer shall declare the nominal length, width, and thickness of the board.
These dimensions shall be measured in accordance with ISO 29465 (length & width), ISO 29466 (thickness),
ISO 29467 (squareness), and ISO 29468 (flatness) and shall be subject to the tolerances detailed in Table 1.
Table 1 — Dimensional tolerances
Permissible deviations of measured Test meth-
Dimension
values from nominal dimensions od
±5 mm or ±1 %, whichever is the greater
Length, l on average of measured values for each ISO 29465
single specimen
±5 mm on average of measured values for
Width, b ISO 29465
each single specimen.
±3 mm on average of measured values for
Thickness, d ISO 29466
all specimens tested.
For each 1 000 mm of the longest face
dimension, the maximum deviation shall
be not more than 3 mm.
Squareness ISO 29467
The edge plane of the thickness dimension
of the board shall be not more than 3 mm
...