Interstitial moisture—water present within building materials—can significantly influence thermal performance and, consequently, Energy Performance Certificate (EPC) predictions. Moisture accumulation in walls, roofs, or floors affects insulation efficiency, heat transfer, and energy consumption, making EPC assessment more complex.
Key Considerations for EPC Assessment:
Variable Thermal Conductivity – Moisture increases the thermal conductivity of materials, reducing their insulating capability. EPC models must account for these variations to avoid overestimating energy performance.
Seasonal Moisture Fluctuations – Interstitial moisture can vary seasonally due to humidity, precipitation, or building usage, influencing heating and cooling loads across the year.
Material-Specific Impacts – Different building materials respond uniquely to moisture. Accurate EPC modelling requires data on porosity, absorption rates, and drying characteristics.
Simulation Challenges – Standard EPC software often assumes dry building materials. Modeling moisture dynamics may require advanced simulation tools or calibration against measured performance.
Strategies for Accurate EPC Modelling:
Advanced Moisture Modelling – Use software capable of simulating moisture accumulation and its impact on heat transfer.
Monitoring and Data Collection – Incorporate real-world data on moisture levels and seasonal variations to improve EPC accuracy.
Expert EPC Assessors – Engage assessors experienced with moisture-sensitive structures for realistic energy predictions.
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