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Basement Underpinning Experts

Basement Underpinning Toronto

Do you want to convert unusable space in your basement to a functional, livable space? If so, basement underpinning is a great option

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The Experienced Basement Underpinning Team
Toronto's Basement Underpinning Experts
The process of underpinning or lowering a basement is done for a number of reasons: A homeowner may want to convert a crawl space or unfinished basement into a useable area, the original foundation might be unstable, the foundation walls could be heavily cracked and require additional support, or an extra storey may dictate underpinning to increase load capacity. Get a Free Quote

Is Basement Underpinning Right For Your Home?

Your home’s foundation must be solid and basement underpinning can help your foundation structure stay secure and avoid cracks or leaks. This base, serves as the foundation for your home’s structural framing and basement walls. If there is evidence that your basement is compromised, you should consider a foundation repair. However, if you plan to renovate and add a story to your home, you should talk to a foundation expert about a basement underpinning project. Our experienced contractors can determine whether your home requires basement underpinning in Toronto as an affordable solution to your needs.

Causes of Basement Problems

Subsidence is described as the sinking of the ground because of underground movements usually due to excavation or mining of natural resources (water, gas, oil, minerals). When this occurs the underground subsoil around your basement can move, pulling away from the foundation. The soil in Toronto and the surrounding GTA is predominantly Luvisol, which is a mix of sand and clay. Foundations built on expanding clay are especially vulnerable to soil failure or weak foundations. A house may be built inadequately with lower quality building materials, or the basement foundation was  back filled improperly, or the drainage system near the basement footings may fail. Extreme seasonal fluctuations are another cause of the sinking or flooding.

What is Basement Unerpinning?

Basement underpinning (basement lowering) is the process of removing soil below a crawlspace or concrete slab, excavating the area to create a lower support level and then adding new concrete footers, walls and floor to extend the depth or reinforce an unstable foundation.

This worthwhile home improvement requires professional expertise in foundation walls, excavation, footings and concrete floor replacement. Royal Work Corp. will do a careful evaluation of the foundation and surrounding area to determine job and building code requirements related to excavation depth, plumbing and electrical re-routing, and concrete work.

The process of underpinning or basement lowering is done for a number of reasons: A homeowner may want to convert a crawl space or unfinished basement floor into a livable space, and the size or basement ceiling might be too small. A new finished basement would require additional support, and the basement lowering process can give you extra space, while underpinning can increase your load capacity.

Design Stage

With the initial evaluation complete and your goals established, an engineer and architect will be brought in to design the new space. These experts will draw plans that detail moving and extending load-bearing walls required with this project. They will submit stamped drawings to the local municipality to obtain the necessary building permits before any work begins.

Site Preperation

After plans are complete and permits issued, the site must be prepared for construction. Furnace connections must be re-routed to move all ductwork and equipment out of the way. The next phase requires technicians to install temporary supports or vertical jacks to hold the home or commercial building in place while the underpinning is being done. Wooden boards or steel beams are used to disburse the weight of the structure and are removed once the project is complete.

Lowering the Basement

There are several methods for completing the underpinning process, depending on the purpose for the project. The Traditional Mass method is used for shallow underpinning. In this instance, the soil underneath the foundation isn’t strong enough to support the home. The weak soil is excavated and replaced with mass concrete. This provides both strength and a more efficient distribution of weight. The Beam and Base method utilizes the traditional mass base but also incorporates concrete beams. These are constructed underneath the concrete base to spread the load evenly for better support. A third method called Mini-piled underpinning allows the structure to rest on stable ground of 5 to 15 meters below the current footers. Piles are constructed and cased in steel. The 15 cm to 30 cm piles are driven into pre-drilled holes to rest on more stable ground.

The fourth and more aesthetic purpose for basement underpinning requires the existing concrete floor to be removed. The soil is excavated in sections, filled with concrete and small gaps are left between the old and new concrete. Non-shrink grout is used to fill the area in each section.

Finishing the Job Right

Regardless of which type of basement underpinning is done, once the process is completed, the old plumbing problems can be fixed with new plumbing installed. Our experts will now install a waterproofing system to keep the area dry. A waterproofing membrane is added to prevent water infiltration from the outside. The exposed foundation walls are then backfilled. It’s now time to waterproof the interior of the basement. An internal weeping tile system is placed around the entire perimeter of the room, below floor level. This drainage pipe will capture ground water and re-route it to a newly installed sump pump that will safely discharge outside. A layer of gravel covers the entire floor area and will provide a secure base for the new concrete floor.

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All the Advantages

Benefits of Basement Underpinning

Great Investment

Although their is a cost, basement underpinning might be essential and worth the investment. Things happen from time to time that cause the foundation to become less stable.

Protect Against Flooding

There are many possible causes for this, including the natural deterioration of the foundation as a house age, as well as poor workmanship, damage from other repairs, climate change, soil change, and events such as a flood or an earthquake. You can save your basement against flooding.

Strengthen Foundation

Another possibility is adding an addition to the house, which places additional strain on the foundation. These events may cause the foundation to shift, rendering it incapable of properly supporting the house.