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Where would we be without trees?

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I have no objection to tree hugging although, in some cases, if the tree is too close to your home then I would advise you to get rid of the tree.

This is not being anti-tree (if there a term for this?). Instead I am simply recognizing that trees take a lot of water out of the ground and if the sub-soils heave or contract due to that influence then house stability may be compromised.

The graphic below (lifted from a national newspaper article – sorry about the jaded quality) shows “safe” distances whereby trees can safely co-exist with housing.

Approximate "safe distances" for trees to be close to housing.

If any one tree is within the “safe influencing distance” suggested then it could cause subsidence issues to your home and/or its drainage system.

Conversely, if a group of trees is clumped together they collectively could all be outside the safe distance but act as if within that safe distance.

House foundations are designed to accommodate some ground movements: in extremely bad soils (clays are the worst) foundations may have had to be especially designed and constructed to cope with such hostile conditions.

In other cases the danger that trees pose is indirect: consider tree roots being too close to a drain run (but well away from a home) – those roots can grow into the drains that then fracture and that water leakage either (1) removes fine deposits within your soil and that causes house subsidence or (2) that water swells the soil and that expansion causes soil “heave” (the opposite to subsidence) that causes the same massive damage to your home.

Removal of trees can also cause the ground to swell up (heave) and so tree removal is not something to be done without first taking professional advice.

So – foundations, trees, drains, sub-soil types and their various interactions are all connected. If you disturb that delicate balance inappropriately then you will have potential consequences that may not be insurable. On the face of such damage your insurance claims should be covered but if the insurers believe the damage was self-inflicted because you planted trees too close to your home, or removed them inappropriately, then you run the risk of your claim being reduced or completely thrown out.

This places the burden of maintaining trees firmly on landowners shoulders. Crowning, lopping, root pruning, root barriers, etc…. are all matters that may need to be considered when advising on trees.

Be warned.

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