Heave

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Heave is the opposite of subsidence and there is upward movement of the site caused by swelling of the subsoil. The most common cause is removal of trees, which are older than the house, allowing the subsoil to rehydrate and swell.


Heave is quite rare because the tree has to predate the house and dry out the soil to a point where it does not recover its full moisture content during the winter months.


As a result, removal of a tree is very unlikely to cause heave and, in relation to subsidence damage, it is generally beneficial not only arresting the subsidence movement but allowing cracks to close and the building to return to line and level.

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