EN 12311-1:1999

Overview

EN 12311-1:1999 is a European Standard published by CEN that specifies a laboratory method to determine the tensile properties of bitumen sheets for roof waterproofing. The standard is intended for initial type testing and for factory or site quality control of bituminous roofing membranes. It helps manufacturers, test laboratories and specifiers assess key mechanical characteristics of waterproofing sheets to ensure consistent performance in roofing applications.

Key topics and technical requirements

This part of EN 12311 focuses on the controlled measurement and reporting of tensile behavior for bituminous roofing sheets. Key technical topics covered include:

• Scope and applicability - defines which bitumen-based roofing membranes the test method applies to (roof waterproofing membranes).
• Specimen preparation - guidance on sampling and preparing test specimens to obtain representative tensile results.
• Tensile testing procedure - a standardized laboratory test method used to measure tensile properties (e.g., tensile strength and elongation behavior) under defined conditions.
• Data recording and reporting - requirements for how test results and test conditions are documented to ensure repeatability and comparability.
• Use for type testing and quality control - instructions on applying the test method for product development, certification testing, and routine production control.

Note: The standard defines the method and reporting format rather than prescribing performance thresholds; specific acceptance criteria are determined by product specifications, national regulations or contractual requirements.

Applications and who uses it

EN 12311-1:1999 is used across the roofing and building envelope sector by:

• Manufacturers of bituminous membranes for product development, batch release and factory quality control.
• Independent testing laboratories that perform standardized tensile tests for compliance reporting.
• Architects, specifiers and consultants who require verified mechanical data for material selection and performance comparisons.
• Contractors and roofers seeking assurance that supplied membranes meet specified mechanical characteristics.
• Certification bodies and regulators when assessing conformity to European or national product standards.

Practical benefits include improved consistency of product performance, clearer material comparisons, and stronger quality assurance for roof waterproofing projects.

Related standards

EN 12311-1:1999 is part of the broader family of European standards for flexible sheets and waterproofing products. Users commonly consult other EN standards for complementary test methods, product characteristics, installation guidance and conformity assessment when specifying or testing roofing membranes.

Keywords: EN 12311-1:1999, bitumen sheets, waterproofing, tensile properties, roof waterproofing, CEN standard, tensile testing, quality control, type testing, bituminous membranes.