Unsteady-state thermal analysis of insulated slab-on-ground foundations: impact of edge insulation on ground temperature distribution

This study extends previous investigations on the thermal performance of slab-on-ground foundations by applying dynamic numerical simulations to analyse ground temperature distribution. In contrast to earlier research based on steady-state conditions, the present work incorporates transient boundary conditions that capture both seasonal and diurnal climatic variations. Such an approach allows for a more comprehensive representation of heat transfer processes between the foundation, insulation and surrounding soil. The research focuses on a parametric study of edge insulation configurations, considering variations in thickness, depth and horizontal extension. The analysis aims to assess how different design strategies influence the thermal regime of the soil adjacent to the foundation edge, with particular regard to frost protection and long-term durability. By addressing the time-dependent nature of ground temperature changes, this study seeks to provide a methodological framework for evaluating insulation performance under realistic environmental conditions. The novelty of the approach lies in highlighting the limitations of simplified steady-state calculations and exploring the advantages of dynamic modelling in foundation engineering. The outcomes are expected to support designers and engineers in optimising edge insulation systems, improving the accuracy of building energy models, enhancing the resilience of structures to climate variability, and supporting energy-efficient and resilient building practices in cold and temperate climates.