Would removing a large bay tree cause heave? Trees close to the lot can cause root heave or pavement heave, which can be a tripping hazard. Heave is caused by the expansion of the ground, and is usually associated with clay soils which swell when they get wet. Reply Prev 1. of 2. When a big tree has been in place for a long time the ground around it will be dry compared to other similar areas. Trees act as powerful pumps, and some species such as willow or oak will take a large amount of ground water out of the sub-soil. Removing nearby or even pre-existing trees can be a real problem for the foundations of a property and LABC Warranty have published some advice on how to deal with this common issue. If a tree has not been the cause of clay shrinkage, its removal cannot cause heave - any surplus water will simply drain away. What is heave? Next Reply Author. It is also not good for the health of the tree, increasing the risk that the tree will fall and cause an accident. The ground therefore accumulates water in the absence of this dehydrating effect and swells, forcing the foundations on top of it upwards. I have asked for a formal heave assessment to be carried out but haven't had a response 9,692 posts. Heave. The most common issue being surface pavement damage caused by the occurrence of root heave. Heave can be an issue when a large tree is removed that is significantly older than the property, or where new houses are built on land that was recently wooded. It causes the pavement to lift and crack. Large trees significantly predating and near a property — subject to species, damage history, soil conditions, structural type — may cause more or new damage to a property if removed. Sunday 2nd April … Heave is most often caused when a mature tree dies or is removed and its root network no longer draws water from the subsoil. However, they can also cause significant damage and leave you needing concrete or asphalt repair. The neighbour’s insurance company has so far been very non-committal about heave stating “we do not anticipate heave to be an issue”. Equus. Ground heave often occurs when a mature tree near a property is removed or dies. Would this cause heave to the property by removing them? It’s important to have trees in cities for so many well-proven reasons, but without adequate consideration, trees in urban environments can cause costly damage to built infrastructure. Discussion. Removing a mature tree from dry ground can cause more damage than leaving it alone, as it could lead to ‘heave’. Heave from tree removal. Ground heave occurs when the ground beneath a building moves upwards, i.e. There are situations too where tree removal is not a solution due to the possibility of heave. My concern is that removing the willow tree may cause heave. Tree Removal Can Cause Ground Heave and it Can be Nasty. The roots cover up to three times the area of the canopy removing water from a big area. When a tree is removed from the soil, water is no longer being absorbed by the tree roots meaning the soil will start to swell as it gets wet. Once the tree is removed this water will re-hydrate the sub-soil and cause it to expand. This effect can cause cracks as the house settles lower into the ground. the opposite of subsidence. What causes the ground to heave? Heave can only occur where subsidence has occurred before it: the shrunken clay, in re-wetting, returns to its original volume, thus causing uplift to any foundation set upon it. Similarly, if a large tree is felled, the water table can be affected as nothing is removing the water any more. Once the tree is removed this water will re-hydrate the sub-soil and cause it to expand. 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