Calgary’s climate swings from –30°C in January to +30°C in July, which puts unique stress on containment systems. Many local engineers overlook how freeze-thaw cycles affect HDPE geomembrane performance — especially in the city’s glaciolacustrine clay deposits. A proper specification must account for subgrade settlement induced by seasonal moisture changes, a factor often missed in generic specs. Before selecting a geomembrane, we recommend pairing the material review with a capacidad de carga assessment to confirm the subgrade can support the liner without excessive deformation. Calgary projects that skip this step frequently face wrinkling or tensile cracking within two winters.
Freeze-thaw cycling in Calgary’s clay-rich subgrade can reduce geomembrane tensile strength by up to 20% if the subgrade is not properly conditioned.