TS EN 14909

TS EN 14909 is the Turkish record for a standard on flexible sheets used in waterproofing, focused on plastic and rubber damp proof courses, their definitions, and their characteristics. In building practice, these products are used as continuous barriers or strips to limit the passage of moisture and water through construction details such as walls, foundations, and other junctions. This is a withdrawn TS EN record, so it should be read as a technical reference for understanding the product family and terminology rather than as a current basis for conformity claims.

What flexible damp proof sheets are

In general technical usage, plastic- and rubber-based waterproof sheets are valued for low permeability, flexibility, and the ability to adapt to complex details. The term damp proof course refers especially to a layer intended to interrupt capillary rise or horizontal moisture transfer within a building element. The emphasis is less on a single material type and more on the functional outcome: maintaining a continuous moisture barrier and preserving that continuity at joints and transitions.

Why definitions and characteristics matter

A title centered on definitions and characteristics helps keep different products from being grouped together under the same name when their intended use or performance can differ. Shared technical terminology makes it easier for designers, manufacturers, and installers to discuss material type, flexibility, dimensional behaviour, and other relevant properties in a consistent way. From a building-physics perspective, the practical value of these sheets lies not only in resisting water penetration, but also in staying intact across seams, corners, penetrations, and movement-prone details.

This listing is based on EN 14909:2006 and reflects a terminology-and-characteristics-oriented standard family. Detailed product suitability, performance verification, and installation conditions must always be checked against the current project documents and the relevant technical references.