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Planning Your Conservatory Foundations – Tree Roots

16 February 2011

One of the considerations that you need to think about when planning your DIY conservatory is the position and location of trees in relation to your conservatory. And we don't just mean for viewing purposes but the roots of the trees may put pressure on a light-weight structure such as a conservatory, thus in turn causing structural damage.

If you are building near trees and you come across tree roots when digging the conservatory foundations, you will need to ensure that the roots do not damage your structure. One way that you can prevent the roots from damaging the foundations is ensuring the growth of the roots is bridged. This method allows enough space for the roots to grow without them causing structural damage.

Alternatively you can remove the trees that are causing concern though this may be an issue if the tree in question belongs to your neighbour! Also for the more established trees it is not a decision that you can take lightly. The trees can take a long time to grow, so it is not only bad for the environment, but the tree cannot be replaced easily. If you do decide to remove a tree(s), it would be advisable to consult an arborist before you remove a tree on your property.

Removing a tree and its roots could present a further problem called clay heave. Clay heave happens when clay material expands due to too much moisture, which can be caused when vegetation which normally pulls in this moisture is removed. If the clay expands this could then cause your conservatory foundations to become unstable as it can push the floor up. If your garden soil is clay based, you could be prone to clay heave, so you will need to protect the foundation of the conservatory by providing a cushion around the base using anti-heave materials.

If you do have any concerns about trees and their roots in location to your DIY conservatory, then it would be advisable to seek advice of a professional Arborist who will be able to advise you on the best action to take.