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N Mark for bitumen waterproof membranes
N Mark of quality for bituminous waterproofing membranes

N Mark for bitumen waterproof membranes

N Mark for bitumen waterproof membranes

The N Mark for bituminous waterproofing membranes certifies the quality of bituminous sheets with reinforcement for waterproofing coatings, modified bitumen sheets and bituminous plaques with reinforcement

The N Mark for bituminous waterproofing membranes certifies the requirements of the following products, based on European and national standards:

  • Reinforced bitumen membranes for roof waterproofing
  • Modified asphalt membranes
  • Reinforced bitumen sheets

The AENOR certification demonstrates that manufacturers or installers comply with customer requirements.

AENOR product certification is accredited by the National Accreditation Entity (ENAC) and is recognised in the General Register of quality standards of the Technical Building Code (CTE) by the Directorate-General for Architecture and the Housing Policy of the Ministry of Public Works and Transport.

  • Flexible sheets for waterproofing. Reinforced bitumen sheets for roof waterproofing (UNE-EN 13707:2005 + A2)
  • Waterproofing. Modified bitumen materials. Polymer modified asphalt membranes (UNE 104244)
  • Mineral and/or synthetic reinforced bitumen sheets (UNE-EN 544)

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 standard of quality 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 products

The certification process consists of the following phases: ​


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 AENOR technical staff have analysed the documents, compliance assessment activities will be performed in order to verify that the products comply with the applicable standards:


A visit is made to the production centre to carry out the following procedures:

  1. The quality management system is audited every two years according to requirements of UNE-EN ISO 9001 directly related to the production process.

  2. There is a twice-yearly inspection of the manufacturing process and production controls carried out by the manufacturer to ensure product compliance with the requirements of the standard.

  3. Samples are taken twice a year and sent to a certified laboratory to perform the tests established in standards. The manufacturer sends samples identified by the auditor to the laboratory.​​


The laboratory performs the tests established by the standard and sends its 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 certification process has been completed, organisations obtain: ​

  • The AENOR product certificate
  • A licence to use AENOR's Mark of certified products
AENOR N Mark logo for a certified product

European Passport

​​The CE MARK is a passport for building products

The CE mark provides access to the European Economic Area for construction products

GlobalEPD Declarations

Environmental product declarations (EPD)

​​​​AENOR manages the GlobalEPD Programme of verification, in accordance with Standards ISO 14025 and ​EN 15804