The freeze-thaw cycle happens when temperatures drop below freezing and then rise again, causing the ground to expand and contract repeatedly. While this process is a normal part of winter weather, it can place ongoing stress on drainage systems buried beneath the surface, leading to damage that develops gradually rather than all at once.
Freezing Ground Putting Pressure on Drainage Pipes
When water in the soil freezes, it expands and pushes outward against nearby structures. Drainage pipes can be affected by this pressure, particularly older systems made from rigid materials. Over time, the repeated stress can weaken joints or create small fractures, allowing water to escape or debris to enter the pipework. In cases where problems keep returning, firms such as //www.wilkinson-env.co.uk/drainage-services-cctv-surveys-midlands/cctv-drain-surveys/coventry, which provide a CCTV drain survey Coventry, can identify hidden damage underground.
Soil Movement and Pipe Misalignment
As frozen ground thaws, the soil contracts and settles again. This constant movement can cause pipes to shift slightly or become misaligned. Even small changes can disrupt the flow of wastewater, creating areas where waste collects and blockages form more easily.
Cracks Allowing Debris and Roots Inside
Small cracks and gaps created by freeze-thaw movement can allow silt, grit, and organic matter into the drainage system. These openings may also attract plant roots seeking moisture, which can grow inside the pipe and worsen blockages over time. Forest Research further explains the dangers of plant roots.
The freeze-thaw cycle can quietly weaken drains, so repeated winter drainage issues should always be checked before they lead to more serious damage.
