Toronto Underpinning & Basement Lowering

If you want to make your home more livable, you should start by looking in the basement. But what would happen if your family needs to make a comfortable living place below in your unfinished basement? For this reason, it’s essential to create extra living space to your basement via underpinning, also known as basement lowering. For this type of basement foundation repair, waterproofing companies have to dig all the way down to your home’s footing in order to reinforce the base of your foundation walls and maximize ceiling height. Many older homes’ basements have lower headroom since they were never meant to be living spaces, with low ceilings and exposed ductwork. Without a doubt, basement lowering is a difficult undertaking given the number of materials required. However, it will significantly improve your living area and increase the worth of your house.

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

Excavating the basement floor many feet below the surface is known as basement lowering, also often referred to as underpinning. By ensuring that the basement is accessible and useable, you may raise the value of your home. Moreover, underpinning increases the stability of the building and enhances the aesthetics of your home. Since most of these basements are just six feet high, it is best to lower the basement by two feet in order to give 8 feet of headroom overall.

Here are some terms and processes you will want to familiarize yourself with before you meet with a contractor when it comes to Underpinning


Using the benching approach adds more living space. The benching system allows you to raise overall height in the same way as the underlying approach, but with less square footage. If the space is completed in compliance with the benching system, this works for a wide range of uses. Compared to underpinning, this technology is less costly and needs half the time.

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 is removed
  • The earth is dug up to the appropriate levels; the amount of height needed will dictate how much the concrete must protrude from the wall.
  • Should you lower your basement by one foot, your concrete bench should be one foot to one and a half away from the internal wall.
  • The perimeter is created after excavation so that benching may be poured.
  • The new plumbing is installed; a sewer injector will be needed if the elevations for the new piping cannot be met.
  • After that, the property is waterproofed by installing the internal drainage system.
  • For the base, at least three inches of ¾ gravel are laid down on the floor.
  • Next, a freshly laid concrete floor is completed with a trowel.

Underpinning Process

The underlying system’s main goal is to increase living space. With the aid of this technology, you may increase the basement’s total height and area. Most homeowners select this course because it gives them the option of expanding their living area by building a fully finished basement or renting out their basement, which will bring in money.

Basement lowering and underpinning
Underpinning Completed

First step is to have engineer drawings and permits.

  • Concrete floor is removed and the soil is excavated to proper elevation
  • The pins are dug out in sections according to the engineers drawings, typically in three stages
  • If new posts are required then new footings for posts are installed, which means temporary jacks are installed to support beam
  • After the first stage of pins is completed there is a 2 inch space between the existing footings and concrete where a 2 inch dry pack grout is installed.
  • Once all three stages are completed, the new plumbing is installed, if the elevations for new plumbing cannot be meet then a sewer injector will be required.
  • The interior drainage system is then installed in order to waterproof the property
  • A minimum of 3 inches of ¾ gravel is placed on floor for base
  • Then new concrete floor is installed and trowel finished

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

Your home may be drastically changed by moving the basement. However, you have to perform it correctly because it’s a significant project that will affect the construction of your entire house. Before taking any dangers or short cuts, be sure the company you choose to finish the task has liability insurance and backing.

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

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