ISO 24353:2008/Amd 1:2021

Overview

ISO 24353:2008/Amd 1:2021 is an important international standard that addresses the hygrothermal performance of building materials and products. Specifically, this amendment focuses on refining the determination of moisture adsorption and desorption properties as building materials respond to variations in environmental humidity. Published by the International Organization for Standardization (ISO), this update enhances testing methods to better assess material behavior under fluctuating humidity conditions, which is critical for ensuring durability, energy efficiency, and indoor air quality in construction.

This amendment clarifies procedures regarding air flow control during testing, aiming to improve the accuracy of moisture resistance measurements on a material’s surface. By optimizing test conditions such as air movement inside moisture-proof enclosures, the standard ensures consistent and reproducible results important for architects, engineers, researchers, and manufacturers.

Key Topics

• Hygrothermal Performance: Focuses on how building materials interact with moisture and heat, crucial for thermal comfort and structural integrity.
• Moisture Adsorption/Desorption: Details methods to quantify how much moisture materials absorb from or release to the environment as humidity changes.
• Air Flow Adjustment: Specifies the use of fans to stir air inside testing chambers to achieve precise vapor resistance values on specimen surfaces.
• Water Vapour Surface Resistance: Introduces updated measurement criteria to ensure standardized results, targeting a resistance value around 13 ± 2 (×10⁻⁶ m·h·Pa/μg).
• Test Environment Control: Emphasizes the importance of controlling moisture-proof box conditions during testing for accuracy and consistency.

Applications

The ISO 24353:2008/Amd 1:2021 amendment serves practical applications across the construction and building materials industries:

• Material Development: Manufacturers use the standard to evaluate and improve moisture-related durability of products such as insulation, drywall, and wood composites.
• Building Design: Architects and engineers design building envelopes with materials tested for moisture buffering capacity and adsorption characteristics to prevent mold and degradation.
• Quality Control: Testing laboratories apply the specified procedures to verify compliance of materials, ensuring performance under real-world humidity fluctuations.
• Sustainability Assessment: Supports energy-efficient construction by helping select materials that maintain indoor climate stability through controlled moisture exchange.
• Research and Innovation: Provides a robust baseline for scientific studies related to hygrothermal dynamics, aiding development of next-generation building technologies.

Related Standards

This amendment complements a suite of international standards addressing building materials and environmental performance, including:

• ISO 13788: Hygrothermal performance of building components and materials - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods.
• ISO 12572: Hygrothermal performance of building materials and products - Determination of water vapour transmission properties.
• ISO 16643: Thermal performance standards of building materials and products.
• ISO 10456: Provides guidelines on the designation and properties of thermal insulation materials used in building constructions.
• ISO/IEC Directives, Part 1 & 2: Outline editorial and development rules applied to ensure consistency and quality in ISO documentation.

By referring to ISO 24353:2008/Amd 1:2021 along with these related standards, stakeholders can comprehensively assess moisture interactions in building materials, contributing to better performance, durability, and occupant health.

Keywords: ISO 24353 amendment, hygrothermal performance, building materials moisture test, moisture adsorption desorption, vapor resistance, humidity variation, moisture-proof testing box, building envelope moisture control, building product standards, thermal performance building materials.