This is cover against subsidence, heave and landslip.
Subsidence is where the ground beneath a property gradually gives way or ‘subsides’.
Heave is the opposite of this, where the ground rises.
While landslip is where the ground moves, such as down a hill.
All of these events have the potential to damage a property built on them.
Initially, large cracks may begin to appear in the walls, with the worst cases resulting in structural failure.