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Steel underpinning posts supporting an excavated foundation wall during structural reinforcement

Foundation Support

Professional Underpinning & Foundation Support

Underpinning stabilizes and extends an existing foundation — used both to correct settlement and to lower a basement floor for usable height in older Toronto homes.

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What It Is

Extending The Foundation Downward.

Underpinning is performed when the existing foundation needs to reach deeper or carry more load than it was originally built for. New concrete is placed beneath the existing footing in sequenced sections, each one cured before the adjacent section is opened.

Because the structure is being supported through the process, the sequencing and section widths matter as much as the concrete itself. This is not work that should be improvised on site.

Steel underpinning posts supporting an excavated foundation wall during structural reinforcement

Signs It May Be Required

When Repairs Alone Aren't Enough.

Where movement continues after cracks have been repaired, the issue is usually below the wall rather than in it. Underpinning addresses the support the foundation is sitting on.

Indicators

  • Cracks that reopen after repair
  • Stepped cracks in block or brick
  • Sloping or uneven basement floors
  • Doors and windows out of square
  • Shallow or undersized footings
  • Settlement on one side of the home

Related Work

  • Basement lowering
  • Foundation stabilization
  • New foundation drainage
  • Waterproofing at new depth
  • Concrete floor slab
  • Structural reinforcement

How It Works

Sequenced, Supported, Section By Section.

Every project starts with the existing conditions: wall type, footing depth, soil, access and what the homeowner wants the finished basement to be.

Note: engineering drawings and permit applications are handled by the appropriate professionals where the project requires them.

  • Site preparation & access
  • Staged excavation beneath footing
  • Formwork and reinforcement
  • Concrete placement and curing
  • Adjacent sections repeated
  • Drainage, waterproofing & slab
Excavator digging a foundation trench at a residential work site with a surveyor nearby

How It Works

From Inspection To Final Repair.

  1. 01

    Tell Us What's Happening

    Call us or submit an inspection request with information about the issue you're seeing.

  2. 02

    We Inspect The Problem

    The property and affected areas are assessed to determine the likely source and appropriate repair.

  3. 03

    Receive A Recommended Solution

    We explain the recommended work, the project scope and what it involves.

  4. 04

    We Complete The Repair

    Our team completes the waterproofing, foundation, drainage or masonry work.

  5. 05

    Your Home Is Protected

    The project is completed and the work area is properly restored.

Underpinning Projects

Foundation Support Work In Toronto.

Exterior Waterproofing project in East York — Exterior foundation wall excavated to the footing with dimple membrane and new weeping tile in clear stone

Waterproofing — East York

Exterior Waterproofing

Full side wall excavated to the footing, foundation cleaned and sealed, dimple membrane installed over the wall and new weeping tile bedded in clear stone before backfill.

Interior Waterproofing project in Toronto — Interior basement perimeter drainage trench with new pipe in clear stone and a sump pit installed

Waterproofing — Toronto

Interior Waterproofing

Concrete floor cut back along the perimeter, new drainage pipe laid in clear stone and a sump pit installed on a seeping wall with no exterior access.

Side Yard Waterproofing & Parging project in Toronto — Narrow side yard excavated to the footing with dimple membrane fastened to a parged foundation wall and drainage cleanout risers in clear stone

Waterproofing — Toronto

Side Yard Waterproofing & Parging

Narrow side yard excavated past the basement entry, wall parged and sealed, dimple membrane fastened the full height and new weeping tile with cleanout risers set in clear stone.

Common Questions

Underpinning FAQs

Still unsure what applies to your home? Call us and describe what you're seeing.

Underpinning strengthens and extends an existing foundation by excavating beneath the original footing in small, controlled sections and pouring new concrete below it. Each section is completed before the next begins so the wall above remains supported at all times.

Completed foundation waterproofing project at a Toronto home at dusk

Planning A Basement Lowering Or Foundation Repair?

Have the foundation assessed so the scope, sequence and structural requirements are understood before work begins.

Call NowRequest Inspection