TS EN 13956/AC

TS EN 13956/AC is the corrigendum to EN 13956 for flexible sheets used in roof waterproofing. Its subject is the definitions, characteristics, requirements, and conformity assessment of flexible sheets intended to keep roofs watertight. Within that scope, the document covers plastic and rubber sheets, including sheets made from blends and alloys of those materials, such as thermoplastic rubber.

Material families used in roof waterproofing

This document addresses a product family rather than a single material. Plastic sheets are generally polymer-based, while rubber sheets are valued for their elasticity and recovery. Blends and alloys combine characteristics from both families, and thermoplastic rubber is a common example of that hybrid approach. In roof applications, these distinctions matter because flexibility, aging behaviour, weldability, and installation method can influence how the waterproofing layer performs in service. In general technical terms, roof waterproofing aims to create a continuous barrier that prevents rainwater and meltwater from entering the building structure.

What the corrigendum means as a document type

The AC designation shows that this is a correction to the existing EN 13956 text, not a standalone product standard that replaces the base document. It therefore supports the terminology and technical consistency of the main standard for roof waterproofing sheets. In practice, product selection and technical documentation consider the sheet material, its intended use, and the characteristics addressed by the standard together. That helps users compare different polymeric and elastomeric sheet solutions within the same roofing application.