Overview
SIST ISO/TR 9165:1997, Practical thermal properties of building materials and products, specifies the methodologies for determining and adjusting thermal conductivity and thermal resistance values of construction materials to obtain practical design values. Developed by SIST in alignment with ISO technical guidance, this technical report focuses solely on the thermal characteristics of building materials, particularly thermal conductivity and thermal resistance, which are essential parameters for assessing the energy performance of buildings.
Accurate assessment of thermal properties not only influences energy efficiency and environmental comfort but also ensures compliance with building regulations. The standard establishes a framework for converting laboratory test results into real-world, applicable values for use in the construction industry.
Key Topics
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Thermal Conductivity and Resistance:
The document defines how to express, measure, and interpret practical values for building materials in terms of thermal conductivity (W/mK) and thermal resistance (m²K/W) under typical building conditions.
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Correction Procedures:
It provides detailed procedures for correcting laboratory test values to account for influences such as temperature, material density, humidity, aging, and installation practices. This ensures that the values used in building design reflect on-site conditions.
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Testing Methods:
The standard references validated test methods such as:
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Material Categorization:
Guidance is given for common insulating materials such as mineral wool, cellular plastics (polystyrene and polyurethane), foam glass, timber and derivatives, concrete, and masonry.
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Statistical Considerations:
Recommendations are made for presenting mean values and standard deviations, with guidelines on how to interpret and use them in calculations for national standards.
Applications
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Building Thermal Performance Design:
Practical thermal property values are critical in calculating wall, roof, and floor insulation requirements, ensuring compliance with local energy efficiency regulations.
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Heating, Ventilation, and Air Conditioning (HVAC) Design:
Engineers use these corrected values to accurately estimate heat transfer, size equipment, and prevent thermal bridging.
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Energy and Cost Optimization:
The standard’s procedures support annual energy consumption predictions and help in economic assessment of insulation measures, guiding choices for cost-effective and environmentally friendly construction.
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Product Certification and Quality Control:
Manufacturers rely on these methodologies to verify that their products meet performance specifications under real operating conditions, facilitating product labeling and market acceptance.
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Retrofitting and Restoration:
When improving existing structures, using practical thermal property values ensures realistic estimations for upgrades to insulation systems.
Related Standards
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ISO 7345: Thermal insulation - Physical quantities and definitions
Covers terminology used in thermal property measurements.
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ISO 8301: Thermal insulation - Measurement of steady-state thermal resistance and related properties - Heat flow meter method
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ISO 8302: Thermal insulation - Determination of steady-state thermal resistance - Guarded hot plate method
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ISO 8990: Thermal insulation - Determination of steady-state transmission properties - Guarded hot box method
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ISO 2859, ISO 3951: Procedures for statistical interpretation of sampling and test data
By employing SIST ISO/TR 9165:1997, professionals and stakeholders in the construction and building materials industry can achieve precise, standardized, and practical assessments of the thermal properties of materials, supporting the development of sustainable and energy-efficient buildings.
