What is underpinning in construction?

Underpinning is a method used in construction to strengthen and stabilize the foundation of a building or structure. This is typically done when the existing foundation is not strong enough to support the weight of the building, or if the foundation has become damaged or compromised.

There are several techniques for underpinning, including traditional mass concrete underpinning, mini-piled underpinning, and beam and base underpinning. The method used will depend on the specific circumstances of the building and the extent of the foundation issues.

Underpinning can be a complex and costly process, but it is often necessary to ensure the safety and stability of a building. It should only be carried out by experienced professionals who understand the structural requirements and safety considerations involved.

In addition to strengthening the foundation, underpinning can also be used to increase the depth of the foundation in areas where the soil is unstable or to accommodate additions or changes to the building structure.