EN 14909:2006/prA1

Overview

EN 14909:2006/prA1 is a European standard developed by the Technical Committee CEN/TC 254, focusing on flexible sheets for waterproofing, specifically plastic and rubber damp proof courses. This standard defines the definitions and characteristics of plastic and elastomeric sheets used in construction to prevent moisture ingress through walls. It addresses essential performance criteria and testing methodologies fundamental to quality assurance in the construction materials industry.

The amendment prA1 clarifies testing requirements related to durability against chemicals, particularly emphasizing the applicability of accelerated ageing tests in alkaline environments for polyolefin-based sheets. Originally published in 2006, this amendment was circulated for enquiry by CEN members in 2008 and supports compliance with European Commission directives.

Key Topics

• Scope and Application
  Defines the use of plastic and rubber flexible sheets as damp proof courses (DPC) and vapour control layers primarily in concrete foundation slabs and masonry walls to prevent moisture rising through capillary action.

• Material Definitions
  Establishes precise terminology for polymeric and elastomeric sheets used as waterproofing membranes, ensuring consistency across European construction standards.

• Chemical Resistance (Clause 5.8.2)
  Specifies testing protocols for assessing the durability of polyolefin sheets when exposed to alkaline environments, such as moist concrete.

  • Emphasizes that elongation after ageing shall retain at least 50% of the initial value.
  • Durability evaluation may be mandatory or optional depending on regulatory requirements.

• Testing Principles (Annex C)
  Details standard test methods for accelerated ageing and chemical resistance focused exclusively on polyolefin materials.

  • Tests simulate long-term exposure to moisture and alkalinity typically encountered on-site.

• Amendments Focus
  Clarifies that certain chemical resistance tests were not intended for rubber-based sheets but are specific to polyolefins, providing accurate guidelines for test application.

Applications

• Waterproofing in Building Construction
  Essential for damp proofing walls and foundations, these flexible sheets form a critical barrier preventing moisture penetration and structural damage.

• Concrete Foundation Slabs
  Polyolefin sheets complying with EN 14909 are used as vapour control layers beneath slabs to enhance waterproofing durability against alkali attack from concrete.

• Masonry Damp Proof Courses
  Rubber and plastic sheets help protect brickwork and masonry walls from rising damp - a common source of deterioration in buildings.

• Construction Material Quality Control
  Manufacturers use this standard to certify that their flexible damp proof courses meet rigorous European performance and safety criteria.

• Regulatory Compliance
  Ensures products fulfill EC directives related to construction products, supporting harmonized standards across European markets.

Related Standards

• EN 12311-2
  Specifies the methodology for determining elongation properties of flexible sheets for waterproofing as referenced in EN 14909 for post-ageing elongation tests.

• EN 13967
  Covers flexible sheets for waterproofing below ground level, complementary to damp proof courses covered in EN 14909.

• EN 1504
  Standards for protective coatings and materials ensuring compatibility with waterproofing membranes.

• CEN/TC 254 Standards
  Other standards developed by the Technical Committee on flexible waterproofing sheets that integrate with EN 14909 for a comprehensive waterproofing solution.

EN 14909:2006/prA1 serves as a cornerstone for the specification and testing of plastic and rubber damp proof courses, ensuring reliable moisture barriers in construction materials. Understanding and applying its chemical resistance criteria, especially for polyolefin sheets, is essential for architects, engineers, manufacturers, and quality control professionals aiming for durable waterproofing solutions in the European construction sector.