TS EN 13984

TS EN 13984 addresses flexible plastic and rubber sheets used as vapour control layers in buildings. It covers both reinforced and unreinforced products, providing a common technical basis for identifying materials that perform the same moisture-control function in different construction applications.

What a vapour control layer does

In general building-physics terms, a vapour control layer helps manage the movement of water vapour through the building envelope. These layers are commonly used to reduce the risk of interstitial condensation, help protect thermal insulation, and limit moisture-related damage in roofs, walls and other envelope assemblies. Plastic and rubber-based sheets are often selected where flexibility, continuity and practical installation are important.

Product definition and conformity framework

• Applies to flexible plastic or rubber sheets intended for building use as vapour control layers.
• Covers both reinforced and unreinforced products.
• Specifies product characteristics and the corresponding test methods.
• Provides for evaluation of conformity with the requirements of the standard.

In practice, standards of this kind create a shared technical language for comparing different materials used for the same function. That makes it easier to assess whether key properties such as vapour resistance, durability-related characteristics and installation behaviour are suitable for the intended application. TS EN 13984 is therefore a focused product standard for a specific layer within the building envelope, not a general waterproofing standard for all membranes.