SIST EN 12152:2023/oprA1:2026

Overview

SIST EN 12152:2023/oprA1:2026 is a CEN draft amendment for curtain walling air permeability. It addresses performance requirements and classification for the air permeability of both fixed parts and openable parts of curtain wall systems under positive and negative static air pressure.

This document applies to curtain walling specified in EN 13830 and is relevant to designers, manufacturers, test laboratories, and specifiers working with modern façade systems. As a draft amendment, it is submitted for enquiry and may still change before final approval. It is intended to modify EN 12152:2023, and the existing test results from EN 12152:2002 may still be considered valid in relation to this updated version.

For projects where building envelope performance, façade airtightness, and curtain wall classification matter, this standard supports consistent evaluation and comparison.

Key Topics

The amendment focuses on improving clarity and alignment in the terminology and classification framework used for curtain walling air permeability.

Key areas include:

• Air permeability definition

  • Clarifies how air permeability is expressed and related to overall area or fixed joint length

• Fixed joint and openable joint

  • Refines the distinction between joints in fixed areas and joints in openable elements

• Requirements

  • Updates the way air permeability is assessed for fixed areas under both positive and negative pressure conditions

• Classification

  • Revises classification language to support consistent interpretation of performance categories

• Figure references and terminology

  • Corrects figure keys and titles to improve readability and technical accuracy

These updates are important for ensuring that curtain wall performance requirements are applied consistently across testing, documentation, and product classification.

Applications

SIST EN 12152:2023/oprA1:2026 is especially useful in the following contexts:

• Curtain wall design and specification

  • Helps define air permeability targets for façade systems

• Product testing and evaluation

  • Supports laboratory assessment of curtain wall air leakage performance

• Quality assurance

  • Assists manufacturers in comparing products against European performance classes

• Compliance and procurement

  • Useful for project teams seeking standardized façade performance criteria

• Building envelope engineering

  • Contributes to better control of airflow through curtain walling assemblies

In practice, the standard helps stakeholders evaluate how curtain wall systems behave under pressure differences, supporting more reliable façade selection and performance reporting.

Related Standards

Several standards are closely connected to SIST EN 12152:2023/oprA1:2026:

• EN 13830 - Curtain walling standard referenced in the scope
• EN 12207 - Relevant for openable parts and joint classification
• EN 12152:2023 - The base standard modified by this draft amendment
• EN 12152:2002 - Previous edition referenced in the note on continued validity of test results

For professionals working with European façade standards, air permeability classification, and curtain wall testing, SIST EN 12152:2023/oprA1:2026 is a key document to monitor during the standardization process.