Underpinning is the process of strengthening and stabilizing the foundations of the home or property. It needs to be carried out if the initial foundation isn’t strong enough or an extension has meant the structure has changed due to subsidence.
Underpinning can often be avoided in cases of minor subsidence which is not uncommon in developments built on shrinkable clay. Heavy foliage, trees or even a hot summer can result in moisture loss in the soil causing shrinkage and thus subsidence. Soil and root samples will usually be taken to pinpoint the cause. Removal of trees can reverse the process as the moisture returns to the clay, called ‘heave’.
The process of underpinning can be messy and disruptive. It involves increasing the depth of the foundations by excavating the soil underneath the existing foundations and filling the space, usually with concrete.
If underpinning isn’t carried out to a professional standard it could lead to further damage and, in a worst case scenario, could cause the existing property to collapse. Underpinning existing foundations will usually require building regulations approval.
When a building’s foundations start to sink, subsidence occurs. Serious subsidence issues are rare but areas with clay soil are most vulnerable.
The main causes of subsidence are:
Fine and minor cracks in a new building’s plasterwork are quite common. Same with new extensions. While they are not necessarily indicative of the dreaded S-word, there are classic signs to look out for, which include:
Underpinning is a technical process and Builder Guide can put you in touch with recommended builders who specialise in underpinning capable of carrying out the work out.
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