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N Mark for geosynthetic barriers
N Mark of quality for geosynthetic barriers

N Mark for geosynthetic barriers

N Mark for geosynthetic barriers

The N Mark certifies the quality of geosynthetic barriers

The N Mark for geosynthetic barriers certifies the quality of these products, used as waterproofing membranes for fluids in building tunnels and underground works; construction of liquid waste disposal sites, transfer stations and secondary containment; construction of solid waste storage and disposal sites; construction of reservoirs and dams, construction of canals​.

The AENOR certification enables manufacturers and installers to demonstrate compliance with the requirements of their clients, in addition to other benefits.

The N Mark covers geosynthetic barriers for:

  • The construction of dams and quarries (UNE-EN 13361)
  • The construction of canals (UNE-EN 13362)
  • Use as waterproofing membranes for fluids in building tunnels and underground works (UNE-EN 13491)
  • Construction of liquid waste disposal sites, transfer stations or secondary containment enclosures (UNE-EN 13492)
  • Construction of storage facilities and solid waste disposal sites (UNE-EN 13493)

As a compliance assessor, AENOR is a leading product certification entity. The AENOR N Mark now features on more than 100,000 certified products in more than 40 countries and is one of the world's five most popular quality marks.

The AENOR N Mark is a voluntary mark that enables companies to demonstrate that their products comply with certain requirements set forth in a UNE, EN, ISO standard or technical specification. This proof of compliance, based on AENOR's rigorous monitoring of manufacturing processes and final product tests, will enable holders of the Mark to place products of a high quality and standard on the market, which will instil confidence in the users of certified products.

Royal Decree 314/2006, of 17 March, approving the Technical Building Code (CTE), is the regulatory framework that establishes the requirements that must be met by buildings in terms of basic safety and habitability aspects, established in Act 38/1999 of 5 November, on Building Standards (LOE).

The AENOR N Mark is recognised by the Ministry of Public Works and Transport as a quality standard of the CTE. This recognition means that the Administration is sufficiently confident in the products certified under the AENOR N Mark considering that the use of these products in buildings contributes to compliance with the basic requirements set forth in legislation. For this reason, use of AENOR N Mark products benefits all agents involved in constructing a building.

This way, the AENOR N Mark can provide the following advantages:

The manufacturer

  • Better understanding of a product due to the exhaustive control the AENOR Mark establishes with respect to the same
  • Products that do not comply with relevant standards or regulations can be detected before they enter the market
  • Decreases production costs as a result of greater control during the manufacturing process
  • There are commercial grounds to introduce the product into new markets and facilitate access to works

Business providers and monitoring agents

  • Fewer or no checks upon delivery are required for goods provided for by the CTE
  • Ensures that products used in works comply with applicable regulatory requirements
  • Guarantee that the product has previously been verified in order to determine compliance with the minimum requirements of basic CTE documents

The end user

  • Properties are built using materials of proven quality
  • Product certified by a renowned entity and global leader in certifying building for construction

The certification process consists of the following stages:


The AENOR Mark is voluntary. Companies that want AENOR to certify their product must submit their application in accordance with the formats established by AENOR. This application must include information about the company and the characteristics of the products for which certification is sought.

Once the documentation is analysed by AENOR technicians, the conformity assessment is initiated to verify that the products comply with the applicable standards:


An annual visit is made to the production centre, during which:

    • a) the quality management system is audited in accordance with the UNE-EN ISO 9001 requirements that are directly related to the production process.
    • b) The manufacturer's manufacturing process and production controls are inspected to ensure the product complies with the requirements of the standard.
    • c) Samples are taken and sent to an accredited laboratory, which performs the tests included in the standards. The manufacturer sends samples identified by the auditor to the laboratory.


The laboratory carries out the tests of the standard and sends a report to AENOR.


Using all the information on the activities performed, the Technical Certification Committee (independent body comprising all the interested parties: manufacturers, the Administration, users, monitoring entities and AENOR) will either propose to AENOR that the Mark be granted, or request that one of the activities be repeated due to non-compliance.

Once the Certificate has been granted, the process will continue as the monitoring activities required to keep it must be performed. Samples will be taken, and audits, inspections and tests will be performed on an annual basis. The results are assessed every year by the Technical Certification Committee which decides whether to maintain or remove the Mark.

Once the audit process has been completed, the organisation obtains: ​ ​

  • AENOR product certificate
  • A licence to use AENOR's Mark of a certified product, in accordance with the provisions of AENOR regulations
AENOR N Mark logo for a certified product​​​​​

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