Mississauga Underpinning & Basement Lowering

The basement is the first place you should examine if you want to make your house more habitable. However, what happens if your family needs to lower the floor of your unfinished basement in order to create a pleasant living area? This is why adding more living space to your basement through the process of basement lowering, or underpinning as it is generally called, is crucial. In order to reinforce the base of your foundation walls and optimize ceiling height, waterproofing company must excavate all the way down to your home’s footing for this kind of basement foundation repair. There is less headroom in the basement of many older homes since it was never intended to be a living area with low ceilings and exposed ductwork. With all the materials needed, basement lowering is undoubtedly not a simple task. Nonetheless, it will greatly enhance your living space and raise the value of your home.

See the underpinning process in action!

Check out our Underpinning Process Video

Cost of Underpinning & Basement Lowering

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Benefits of Underpinning and Basement Lowering

Basement lowering, often called underpinning, is excavating the basement floor many feet below the surface. This will guarantee that the basement is usable and accessible, which will increase the value of your house. Furthermore, underpinning strengthens the structure’s stability, improving the appearance of your house. These basements are typically around 6 feet high, thus the ideal height is to reduce the basement by 2 feet to provide for a total of 8 feet of headroom.

Before meeting with a contractor regarding Underpinning, familiarize yourself with some important terms and processes.


The benching method is a great way to create additional living space while reducing your square footage. It allows you to achieve the same total height increase as the underlying method. This system is perfect for many applications, as long as the area is finished according to the benching scheme. It requires half the time and is less expensive than underpinning.

Benching Process

Basement Waterproofing Benching Process
Concrete poured and dried. Benching is complete.

First step is to have engineer drawings and permits

  • “The concrete floor has been removed.”
  • The proper elevation for soil excavation depends on the required wall height, which determines the distance the concrete needs to project.
  • If you lower your basement by 1 foot, your concrete bench needs to be located 1 to 1.5 feet out from the interior wall.
  • “After excavation, the perimeter is prepared to pour the benching.”
  • The new plumbing has been installed, but if the elevations cannot be met, a sewer injector will be necessary.
  • “The interior drainage system is installed to waterproof the property.”
  • To create a proper base, it is necessary to place at least 3 inches of 3/4-inch gravel on the floor.
  • “The new concrete floor has been installed and finished with a trowel.”

Underpinning Process

The primary purpose of the underlying system is to add more living space. You may expand the square footage and overall height of your basement using this technology. Most homeowners decide to choose this path since it allows them to have the choice of increasing their living space by adding a completely completed basement or renting out their basement, which will generate revenue for them.

Basement lowering and underpinning
Underpinning Completed

First step is to have engineer drawings and permits.

  • The concrete floor has been removed and the soil excavated to the appropriate elevation.
  • The engineer’s drawings are used to dig out the pins in sections, generally in three stages.
  • If new posts are needed, temporary jacks are installed to support the beam while new footings for the posts are installed.
  • After completing the first stage of pins, a 2-inch dry pack grout is installed in the 2-inch space between the existing footings and concrete.
  • After completing all three stages, if the elevations for new plumbing cannot be met, a sewer injector will be required for installation.
  • To waterproof the property, the interior drainage system needs to be installed.
  • To create a proper base, it is recommended to place at least 3 inches of 3/4 inch gravel on the floor.
  • “The new concrete floor has been installed and finished with a trowel.”

Find Out More About The Cost Of Underpinning Your Basement – Visit Our Blog

Relocating the basement may significantly transform your house. But you have to do it well because it’s a big undertaking that will impact your home’s entire structure. Make sure the business you select to complete the job has liability insurance and underpinning before taking any chances or short cuts.

RCC Waterproofing is pleased to offer client references and is completely insured.

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