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What is subsidence?
Subsidence is the downward movement of the ground under your home. This movement can cause your foundation to sink or shift unevenly, creating characteristic damage inside and outside of the house. Homes situated on clay tend to be more susceptible to subsidence than homes on other types of soil, as clay will expand in wet weather and contract in dry weather. Leaky drains and tree roots can also cause a house to subside.
Conversely, heave is the upward movement of the ground under your home.
What can subsidence look like?
The signs of subsidence in a home can be distinctive. The main visible effect of subsidence could include but it’s not limited to a crack in the wall that is:
- Diagonal
- Wider at the top than the bottom
- On the inside and outside of the house, i.e. in both the internal drywall and external brickwork in the same place
- Wider than 3mm
- Near doors and windows
Of course, not all cracks are signs of subsidence. Occasionally, small cracks will appear in the walls of newly-built houses, but these are just a result of the house settling under its own weight and should not necessarily be cause for concern.
While cracks are the most well-known effect of subsidence, other signs include:
- Doors and windows jamming or fitting incorrectly
- Wallpaper crinkling where the wall meets the floor or ceiling
- Cracks where an extension meets the main part of the house