Why are buildings in Inuvik often supported on piles frozen into permafrost?

Buildings in Inuvik and other regions with ice-rich permafrost are often supported on piles to maintain the stability of the foundation and prevent structural damage.12

When buildings are constructed directly on the ground, heat from the structure can cause the underlying permafrost to thaw. This thawing leads to a loss of bearing strength and surface subsidence, which can cause buildings to shift or collapse. By elevating structures on piles, builders can minimize the thermal impact on the ground and preserve the permafrost's integrity.321

Additionally, piles help mitigate the effects of [frost heaving]—the upward displacement of the ground caused by the freezing of soil moisture. In areas with poor drainage and fine-grained sediments, frost action is particularly intense; using piles allows the foundation to remain stable despite the seasonal freezing and thawing of the active layer. In some cases, special thermal devices are used to keep the piles frozen firmly into the permafrost, further ensuring the foundation remains secure.13