Freezing temperatures can reduce the flexibility of some liner materials, but the extent depends on the type of plastic used. Many conventional liners stiffen as the temperature drops, which makes them less able to bend with soil movement or ice pressure. This stiffness can raise the risk of small cracks forming if the liner is stressed.
Modern reinforced polyethylene liners tend to retain more of their flexibility in the cold, allowing them to move with the ground rather than resist it. Even so, extremely low temperatures will always slow the material’s ability to stretch. The key is choosing a liner designed with cold-weather performance in mind so it maintains enough pliability to protect the pond or lagoon through winter.
