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Underpinning

A basement with dug out trenches and numbers written on the wall in preparation for underpinning in Toronto, ON

At GRND we offer underpinning services in Toronto. Our underpinning solutions are designed to give your home the stability it needs to last for years to come. We use only the highest quality materials and our team of experts are experienced in a variety of underpinning methods.

Underpinning is the process of underpinning a foundation in order to increase its load-bearing capacity or stabilize the soil beneath it. This is often necessary when adding additional floors or levels to a building, or when repairing damage to an existing foundation. Underpinning can be accomplished by various means, depending on the soil conditions and the desired outcome.

Types of underpinning

There are several different types of underpinning, each with its own advantages and disadvantages.

  • Piling
  • Micro piling
  • Soil nailing
  • Jet grouting

Pilings are long, slender columns that are driven into the ground to support the foundation.

Pilings can be made of wood, steel, or concrete and they can be either round or square in shape.

Piling is a good choice for underpinning because it can be done quickly and is not as disruptive as some other methods. However, it is important to make sure that the piles are driven deep enough into the ground, or they may not provide adequate support.

Micro-piling

Micro piling is a type of underpinning that uses very small diameter piles, usually less than 12 inches (30 cm).

Micropiles can be made of steel, concrete, or fiberglass and they are installed using a small drilling rig. This method is less disruptive than traditional underpinning methods and can be used in tighter spaces.

The nails have to be driven firmly enough into the earth, otherwise they may not be able to support the weight.

Soil Nailing

Soil nailing is a technique that can be used to stabilize slopes or excavations. Soil nails are long rods that are driven into the ground and then grouted in place. This method is less disruptive than traditional underpinning methods and can be used in tighter spaces.

However, it is important to make sure that the nails are driven deep enough into the ground or they may not provide adequate support.

Jet Grouting

Jet grouting is a method of underpinning that involves injecting concrete into the soil at high pressure. This method can be used to underpin both existing foundations and new construction.

Jet grouting is a good choice for underpinning because it can be done quickly and is not as disruptive as some other methods.

The concrete has to be injected at the proper depth or it may not provide sufficient support.

Frequently Asked Questions (FAQ) about Underpinning

What are the benefits of underpinning and is it permanent?

Underpinning is a permanent solution to foundation problems. Once the underpinning is in place, it will support the foundation for the life of the building. In addition, underpinning can be used to stabilize slopes or excavations.

How long does the underpinning process take?

The length of time required for underpinning varies depending on the size of the basement or structure, the type of underpinning used, and the soil conditions.

Piling is generally the quickest method of underpinning, followed by micro-piling and soil nailing. Jet grouting is usually the slowest method.

What are the costs of underpinning a basement?

The cost of underpinning a basement varies depending on the basement size, the underpinning type and the the soil.

Piling is generally the most expensive type of underpinning, followed by micro-piling and soil nailing. Jet grouting is usually the least expensive method.

Do I require a permit for underpinning in Toronto?

In order to underpin your home in Toronto, you will need to obtain a permit from the City of Toronto. (1)

Why choose us at GRND for your underpinning needs?

Our GRND underpinning services are available to both industrial, commercial and residential customers in Toronto.

We have the experience and expertise in underpinning your foundation using a variety of methods, including steel piers, helical piers, micropiles, and more.

We will work with you to determine the best underpinning solution for your needs and budget. Contact us today for a free consultation.

References

1. City of Toronto, Residential Underpinning, https://www.toronto.ca/services-payments/building-construction/apply-for-a-building-permit/building-permit-application-guides/small-residential-project-guides/residential-underpinning-including-basement-entrances/

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