Asked by: Adelia Faig
asked in category: General Last Updated: 16th May, 2020

When should I underpin my foundation?

Underpinning may be necessary for a variety of reasons: The original foundation isn't strong or stable enough. The usage of the structure has changed. The properties of the soil supporting the foundation may have changed (possibly through subsidence) or were mischaracterized during design.

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Subsequently, one may also ask, how do you underpin a foundation?

Underpinning Tips

  1. The underpinning process must be started from the corners and the working inwards.
  2. Underpinning must be made only on load-bearing walls.
  3. Do not underpin below non-load bearing walls.
  4. Start underpinning under a strip of footing.
  5. After the excavation has been completed, add concrete to the cavity.

Also Know, do I need to underpin? Underpinning is only required when your property is experiencing subsidence actively. That is to say the ground is moving away and continuing to move away. If they remain the same, subsidence has come to a halt. Of-course do look out for new cracks which would suggest subsidence has not come to a halt.

Then, when should you underpin a house?

Underpinning is when extra support is provided underneath a building due to subsidence. This can be to directly counter subsidence where your home is actually sinking, or it can be done pre-emptively if neighbouring homes have suffered from subsidence and you want to prevent it affecting your property.

Why would you underpin a house?

The main reasons for underpinning are that the structure of a property has become unstable. The structure of the soil in which the foundations sit has changed, usually because of too much or too little water in it, causing subsidence.

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