Overview
ISO 8145:2026, Thermal insulation - Mineral wool board for overdeck insulation of roofs - Specification, is an international standard developed by ISO. This standard defines the properties, tolerances, and declared values for bonded, human-made mineral wool thermal insulating boards specifically designed for the overdeck insulation of building roofs. The mineral wool board is intended for roofs accessible to maintenance personnel and is designed to enhance thermal performance, fire safety, and durability. The specification covers both products with or without a facing membrane but does not address waterproofing properties when a membrane is provided.
The standard details the requirements manufacturers must meet at the time of delivery, including declared thermal properties, mechanical strength, and product consistency, ensuring reliable performance in construction projects.
Key Topics
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Product Dimensions and Tolerances
- Nominal length, width, and thickness must be declared.
- Controlled tolerances according to international measurement standards.
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Thermal Performance
- Declared thermal resistance (R-value) and thermal conductivity (λ-value) measured according to ISO methods.
- Provides procedures for determining these values using statistical quality control.
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Mechanical and Physical Properties
- Requirements for deformation resistance, interlaminar strength, and breaking load.
- Control of general product attributes such as absence of coarse material, even fibre distribution, resistance to mould and odours, and non-corrosiveness.
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Fire Behaviour
- Products must comply with local fire regulations for roof insulation, considering the presence or absence of a membrane facing.
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Sampling and Conformity
- Outline of sampling and conformity control methodologies to ensure ongoing product quality.
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Marking and Documentation
- Clear guidelines on what information must be marked on the product packaging, such as manufacturer, product codes, thermal properties, and reference to ISO 8145:2026.
- Comprehensive requirements for reporting and traceability, including test reports.
Applications
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Flat and Low-Slope Roof Insulation
- Designed for overdeck installation under roofing systems where waterproofing is provided by other layers.
- Suitable for commercial, industrial, and residential buildings requiring maintenance access.
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Energy Efficiency in Construction
- Helps specifiers and builders select insulation to improve building thermal performance and support compliance with energy codes and sustainability goals.
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Roofing Systems with or without Membrane Facing
- Applicable for installations both with and without a facing membrane-ensuring versatility in roofing design while clarifying that the insulation board itself is not a water barrier.
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Quality Assurance and Specification
- Allows architects, builders, and procurement specialists to specify mineral wool boards with confidence, knowing that products meeting ISO 8145:2026 achieve a high, consistent level of performance.
Related Standards
ISO 8145:2026 references and aligns with several related international standards, supporting a comprehensive approach to thermal insulation for buildings:
- ISO 7345 – Thermal performance of buildings and building components – Physical quantities and definitions
- ISO 8301 & ISO 8302 – Methods for determining steady-state thermal resistance and related properties
- ISO 9229 – Vocabulary for thermal insulation
- ISO 12491 – Statistical methods for quality control of building materials
- ISO 12576-1 – Conformity control systems for factory-made insulation products
- ISO 29465, ISO 29466, ISO 29467, ISO 29468 – Methods for determining length, width, thickness, squareness, and flatness in insulation products
- ISO 29764, ISO 29765 – Methods for determining deformation and interlaminar strength
Adhering to ISO 8145:2026 enhances the reliability, quality, and compliance of thermal insulation systems for roofing applications. This standard serves as a critical reference for product manufacturers, architects, building engineers, and regulators aiming to ensure optimal performance of roof insulation in a variety of climatic and structural conditions.