Ding, Yuansong; Marincioni, Valentina; Schmidt, Anne; Curtis, Roger; (2022) Investigating the role of calibration of hygrothermal simulations in the low carbon retrofit of solid walls. In: Proceedings of the CIBSE Technical Symposium 2022. CIBSE: UK. (In press).

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Abstract

Solid masonry buildings account for around 20% of the UK building stock. As a traditional building material in the UK, stone could enhance the architectural style of buildings and last for thousands of years. However, historic buildings inevitably face the issue of diminished performance over hundreds or thousands of years. For these historic buildings whose appearance is protected, internal wall insulation (IWI) is a possible solution for protecting the façade while saving energy, improving indoor thermal comfort, and reducing carbon emissions. Of concern is that IWI could alter the drying capacity of the structure, thereby increasing moisture accumulation and causing durability issues such as freeze-thaw damage and mould growth. Hygrothermal simulations is one of the most commonly used methods to compare the performance and feasibility of different IWI assemblies. However, an inadequate assessment could lead to the specification of inappropriate IWI, prompting an incorrect choice of retrofit strategy. This study investigates the role of calibration in the assessment of moisture risks and durability of a solid masonry wall. The calibration of a hygrothermal model was performed using in-situ monitoring data; the model can be used for the comparison of IWI systems. According to the results, the selection of material properties had the highest impact in the calibration.

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