Shallow vs. Deep Foundation Repair
Is your foundation sinking? There are two types of foundation repair to consider when faced with a sinking foundation. These are shallow and deep repair. It is important to consider the merits of the different types of repair in order to choose the best system for your situation.
They are also referred to as underpinning. They involve screwing or pushing piers into the ground under the foundation. These piers provide structural support for the home above.
This type of repair us often used when there is a concentrated load. The rods help to distribute the load. They are often used when there is need to bypass an unstable layer of soil and provide more support for the foundation. The piers will help to stabilize the foundation by transferring the weight of the foundation to the stable substrata.
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Examples of deep foundation repair methods include:
- Using helical piers
These consist of a steel shaft that has round helix plates. The pier is screwed into the ground until it touches a stable layer. The helical plates are screwed onto the wall. These plates provide resistance.
- Using push or resistance piers
These consist of hollow pipes that are fitted together and driven or pushed into the ground. A hydraulic ram is used for this purpose. When the load of the house is allowed to settle on the piers, the piers are pushed until they are in contact with stable sub stratum.
These are repairs that address issues with slab-on-grade foundations, e.g. floating slabs. They are best suited for lifting foundations that are not affected by concentrated loads. They often involve the injection of material beneath the foundation to lift the slab and bring it level.
The most common shallow repairs include:
- Foam jacking
This involves the use of polyurethane foam. The foam is injected into holes that have been drilled into the concrete slab. As the foam is injected into the space between the slab and the soil, the slab is lifted.
- Mud or slab jacking
This involves pumping a load-bearing grout underneath the slab. The grout fills the spaces under the slab and raises it. It also provides support for the foundation above. This method of repair helps to restore slabs to their original position and prevent further sinking.
It is important to consider issues such as the cause of the sinking and the soil condition when choosing a repair method. This will ensure the results are durable.