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Different types of underpinning
March 10, 2016 | No Comments

Different types of underpinning

What is underpinning and how does it work for Adelaide homes?

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Underpinning is generally used when foundations of a building have been damaged or may need to be strengthened to withstand the addition of extra storeys to an existing structure.

It is a method which helps to either increase the depth of foundations or to repair those that are faulty. The most likely visible signs of foundation damage will be cracks in the walls or concrete floors.

If you’re looking for underpinning help, then you should first determine which type of underpinning solution you need for your SA home.

This is typically first discovered during a roof restoration adelaide where the building inspector saw what improvements your house needs to make.

What are the different types of underpinning?

There are a number of different types of underpinning and it’s always worth getting the advice of a construction specialist to advise regarding which will be most suitable to your property. Factors that influence their decision could include the age of the property, the type of materials used and the depths required of the foundations.

Types of underpinning commonly used for Australian properties include:

1. Mass Pour

This is the most commonly used method. It involves excavating sections to a pre established depth below the footing, then pouring concrete on each of the created pits. The method is repeated until the whole area has been underpinned.

2. Screw Piles and Brackets

This method is used when it is not possible to opt for traditional underpinning processes. It is often used when building require larger depth of excavation or when the traditional methods are not possible because a piling rig cannot be used.

The screw piles and brackets require installation either by hand or by a mini excavator. There are many advantages to this method rather than traditional pilings; including quicker installation and minimal noise or vibration – therefore limiting potential damage to the surrounding structural area.

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3. Pile and Beam

An excellent method to alleviate footing, this system of underpinning requires a min pile to be installed on either side of the affected wall. Once the installation of the piles is complete, the brickwork is removed below the wall and a reinforced concrete needle beam is used to connect the piles and support the wall.

This can also effect your skylight installation or other roofing structures so you need to investigate this first.

4. Piled Raft

When an entire structure needs underpinning, piled raft methods must be used. In addition, piled raft may be the best underpinning type when foundations are very deep or when the property is in an area with very hard soil which resists excavation.

Piled raft uses piles, reinforced needle beams and results in the building of a ring beam to link all the needles together. Advantages of this method include the minimal disruption to drainage system, provision of lateral and traverse ties throughout the structure and no need for external access.

So if you’re looking for an expert Adelaide underpinning company, then you should ask a professional and licensed building inspector for their advice first – try All Type Roofing in Adelaide – they are great guys.


What is underpinning and how does it work?
March 7, 2016 | No Comments

What is underpinning and how does it work?


Underpinning: What is it?

Within the construction industry, underpinning refers to the process of strengthening and stabilizing the foundation of an existing building or structure. It is generally required when there has been damage to the existing foundations or when the usage of the structure has changed.

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When should you consider underpinning?

Damage to the foundations of buildings will usually present visibly as cracks in the walls or in concrete floors. At this stage, building experts would look at different methods of underpinning to figure out which one would be most suitable to fix the foundations of the building.

If your foundations are not damaged but you are looking to add additional storeys to a property or change the usage of the building, you may want to consult an expert about how you can use underpinning to strengthen the foundations. This will ensure that they withstand the increased loads placed on them and help to prevent damage long term.

This training guide from the Australian government provides more information on why you might consider underpinning.

How does underpinning work?

To achieve the best underpinning results, builders will need to dig underneath shallow footings and extend the foundations of a structure. This will generally be done by pouring concrete to extend the foundations in either/both depth or/and breadth. The purpose of this is to either rest the foundations on stronger soil, or to distribute the load of the structure across a greater area.

Traditional underpinning is a process that is over a century old however with new developments in technology and excavation machinery there have increasingly been new underpinning methods available on the market.

What are the different types of underpinning?

There are a number of different methods of underpinning with each of them being appropriate for different types of structures with differing foundational requirements.

The different methods include:

  • Mass Pour
  • Screw Pile and Brackets
  • Pile and Beam

For more information about underpinning, head over to this digital marketing agency to find who can help with your underpinning needs.