EN ISO 2551:2026

Textile floor coverings and textile floor coverings in tile form - Determination of dimensional changes due to the effects of varied water and heat conditions and distortion out of plane (ISO 2551:2020)

This document specifies a procedure for the determination of the dimensional changes and distortion out of plane likely to take place when textile floor coverings and tiles are subjected to varied water and heat conditions.
The method is applicable to all textile floor coverings and textile floor coverings in tile form.

Textile Bodenbeläge und textile Bodenbeläge in Fliesenform - Bestimmung der Maßänderung infolge der Wirkungen wechselnder Feuchte- und Temperaturbedingungen und vertikale Flächenverformung (ISO 2551:2020)

Revêtements de sol textiles et revêtements de sol textiles sous forme de dalles - Détermination des variations dimensionnelles dues aux effets de diverses conditions de mouillage et de chaleur et de la déformation hors plan (ISO 2551:2020)

Le présent document spécifie un mode opératoire pour la détermination des variations dimensionnelles et de la déformation hors plan susceptibles de survenir lorsque des dalles et des revêtements de sol textiles sont soumis à diverses conditions de mouillage et de chaleur.
La méthode est applicable à tous les revêtements de sol textiles et revêtements de sols textiles sous forme de dalles.

Tekstilne talne obloge in tekstilne talne obloge v obliki ploščic - Ugotavljanje dimenzijskih sprememb in izvijanja iz ravnine zaradi spreminjajočih se pogojev vlage in toplote (ISO 2551:2020)

General Information

• Status: Published
• Publication Date: 07-Apr-2026
• ICS: 97.150 - Floor coverings
• Technical Committee: CEN/TC 134 - Resilient and textile floor coverings
• Drafting Committee: CEN/TC 134/WG 8 - Textile floor coverings
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-Apr-2026
• Due Date: 10-Feb-2028
• Completion Date: 08-Apr-2026
• Ref Project: SIST EN ISO 2551:2026 - Textile floor coverings and textile floor coverings in tile form - Determination of dimensional changes due to the effects of varied water and heat conditions and distortion out of plane (ISO 2551:2020)

Overview

EN ISO 2551:2026 specifies standardized procedures for testing the dimensional changes and distortion out of plane likely to occur in textile floor coverings and textile floor tiles when subjected to varying water and heat conditions. This international standard, published by CEN and based on ISO 2551:2020, applies to all textile floor coverings, including broadloom carpets and tiles. By providing a method to assess dimensional stability and out-of-plane deformation, EN ISO 2551:2026 supports manufacturers, quality assessors, and end-users in evaluating product performance under realistic environmental stresses.

Key Topics

• Dimensional Stability: Measurement of flat dimension changes in textile floor coverings and tiles after exposure to specified moisture and heat conditions.
• Distortion out of Plane: Evaluation of vertical deformation (e.g., buckling, curling) which can affect both aesthetics and safety.
• Test Specimen Preparation: Guidance on sample selection, dimensions, and conditioning to standardize results.
• Test Procedures:
  • Initial measurements on conditioned specimens
  • Exposure to heated, humid, and reconditioned atmospheres
  • Measurements after each treatment stage
• Expression and Reporting of Results: Quantitative expression of changes (in percentage), graphical representation, and required information for comprehensive reporting.

Applications

EN ISO 2551:2026 is widely used across the carpet and flooring industry, including:

• Product Development: Ensures carpets and tiles are engineered for durability and stability, reducing risk of dimensional changes that lead to installation defects.
• Quality Assurance: Provides manufacturers and third-party testers with a repeatable approach to monitor product consistency before market release.
• Specification and Procurement: Supports architects, designers, and buyers in specifying flooring products that meet defined standards for stability and performance.
• Complaint Investigation: Offers an objective method for assessing flooring failures or customer complaints related to shape changes, especially in response to environmental factors.
• Sustainability and Performance Guarantees: Assists organizations seeking to certify products for long-term performance in buildings subject to variable humidity and temperature.

Related Standards

The following international standards are referenced in EN ISO 2551:2026 or form part of the broader context for textile floor covering testing:

• ISO 139: Textiles - Standard atmospheres for conditioning and testing
  Defines the standard atmospheric conditions required for the conditioning and testing of textile specimens.
• ISO 1957: Machine-made textile floor coverings - Selection and cutting of specimens for physical tests
  Describes how to properly select and prepare samples to ensure consistent and representative testing.
• ISO/TC 219: Floor coverings technical committee
  Oversees the development of international standards for all types of floor coverings, ensuring coordinated methods globally.

Practical Value

Applying EN ISO 2551:2026 helps guarantee that textile floor coverings and tile-form products maintain their structure, fit, and appearance throughout their service life, even when exposed to changes in moisture and temperature. Adopting this standard:

• Minimizes installation and service complaints related to dimensional instability or warping.
• Enhances customer satisfaction through reliable, long-lasting flooring materials.
• Simplifies regulatory compliance and streamlines market acceptance across international borders.

Keyword-rich focus: EN ISO 2551:2026, textile floor coverings, textile floor tiles, dimensional stability, floor covering testing, distortion out of plane, CEN standards, ISO 2551:2020.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 2551:2026
01-februar-2026
Tekstilne talne obloge in tekstilne talne obloge v obliki ploščic - Ugotavljanje
dimenzijskih sprememb in izvijanja iz ravnine zaradi spreminjajočih se pogojev
vlage in toplote (ISO 2551:2020)
Textile floor coverings and textile floor coverings in tile form - Determination of
dimensional changes due to the effects of varied water and heat conditions and
distortion out of plane (ISO 2551:2020)
Textile Bodenbeläge und textile Bodenbeläge in Fliesenform - Bestimmung der
Maßänderung infolge der Wirkungen wechselnder Feuchte- und
Temperaturbedingungen und vertikale Flächenverformung (ISO 2551:2020)
Revêtements de sol textiles et revêtements de sol textiles sous forme de dalles -
Détermination des variations dimensionnelles dues aux effets de diverses conditions de
mouillage et de chaleur et de la déformation hors plan (ISO 2551:2020)
Ta slovenski standard je istoveten z: prEN ISO 2551
ICS:
97.150 Talne obloge Floor coverings
oSIST prEN ISO 2551:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 2551:2026
oSIST prEN ISO 2551:2026
INTERNATIONAL ISO
STANDARD 2551
Second edition
2020-05
Textile floor coverings and textile floor
coverings in tile form — Determination
of dimensional changes due to the
effects of varied water and heat
conditions and distortion out of plane
Revêtements de sol textiles et revêtements de sol textiles sous forme
de dalles – Détermination de la variation des dimensions et de
l'incurvation due aux effets de diverses conditions de mouillage et
de chaleur
Reference number
ISO 2551:2020(E)
©
ISO 2020
oSIST prEN ISO 2551:2026
ISO 2551:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2020 – All rights reserved

oSIST prEN ISO 2551:2026
ISO 2551:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Sampling and preparation of specimens . 2
5.1 For textiles floor coverings . 2
5.1.1 Sampling. 2
5.1.2 Number and dimensions . 2
5.2 For tiles . 2
5.2.1 Tiles of dimensions ≤ 500 mm . 2
5.2.2 Tiles of dimensions > 500 mm . 2
6 Conditioning . 2
7 Test procedure . 3
7.1 Initial measurements for textile floor coverings . 3
7.1.1 Distortion out of plane . 3
7.1.2 Dimensional stability . 3
7.2 Initial measurements for tiles . 3
7.2.1 Distortion out of plane . 3
7.2.2 Dimensional stability . 3
7.3 Measurements for textile floor coverings and tiles subjected to varied water and
heat conditions . 3
8 Expression of results . 4
8.1 Dimensional stability . 4
8.2 Distortion out of plane . 4
9 Test report . 4
oSIST prEN ISO 2551:2026
ISO 2551:2020(E)
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
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 219, Floor coverings.
This second edition cancels and replaces the first edition (ISO 2551:1981), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the scope has been expanded to include the testing of textile floor covering tiles and the determination
of distortion out of plane.
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 2020 – All rights reserved
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