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You are here: Home / Foundations / Underpinning – Why and How?

Underpinning – Why and How?

24th June 2022 by Timberley

As West Sussex-based groundworks contractors, we know the importance of solid foundations! The stability and longevity of any building lie in its foundation. Sometimes the foundations of an existing building require strengthening. If that is the case underpinning is the solution. Read on to discover more.

Why might a building require underpinning?

There are several reasons why a building may require underpinning.

Going Up:

Firstly, if a building has an extra floor added, we may strengthen foundations to support the load.

Going Down:

In recent years, whether in London, West Sussex or beyond, a basement or cellar area has become a popular solution for extra space. The underpinning will be employed in these cases as the building’s structure changes.

Getting Older:

Building methods and practices have changed over decades and centuries. And sometimes, a building’s original foundations cannot stand the test of time.

Shifting Soil:

Sometimes soil around a building changes, and consequently, foundations can destabilise. These soil changes may result from many environmental factors, including leaky drains, damaging tree roots or changes in the weather.

How we do it!

As groundworks contractors, we work closely with other professionals, including builders and engineers, on underpinning projects throughout West Sussex and beyond. So, let’s explore three methods of underpinning that we commonly use.

Mass Pour:

This method of underpinning involves digging cavities or pits under the existing foundations, which are filled with concrete. Consequently, this creates a secondary foundation layer beneath the primary foundations.

Mini-piling:

The success of mini piling does not depend on ideal ground conditions. Even in poor ground conditions, we can use this specialist process to create a stable, even framework. This allows for the expansion or extension of a building while also safeguarding against ground heave and subsidence.

Beam and Base:

The block and beam system uses a reinforced pre-cast concrete beam to replace existing footings. These beams are infilled with concrete blocks, and the building’s load is spread more evenly.


If you are looking for underpinning services by professional groundworks contractors in West Sussex, get in touch with us HERE.

 

 

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