Built to spec
Built to your engineered drawings, survey, and the real site conditions, not a one-size-fits-all approach forced to fit.
Commercial & Heavy-Civil Construction
Soil Nail Walls
Harrowgate Group directly completes soil nail walls for developers, general contractors, engineers, and public owners across Toronto, the GTA, and Ontario, coordinating engineered temporary works, site execution, testing, records, and the permanent construction sequence.
- Licensed, Insured & WSIB-Covered
- 20 Years in Business
Get a Quote
Tell us what you need and we’ll get you a quote. Licensed, insured & WSIB-covered · Free, no-obligation quote & on-site assessment.
Get a Quote
Licensed, insured & WSIB-covered · Free, no-obligation quote & on-site assessment.
20 Years in Business
Licensed, Insured & WSIB-Covered Completed to code & Ontario requirements Completed on site and built to the drawings Performed & installed on site across Ontario
Why Harrowgate Group
What to expect from soil nail walls
Made to last
Durable materials and methods chosen for the load, traffic, and environment on site.
Quote-ready
Send specs, drawings, or photos and get a free, no-obligation site visit and estimate with no guesswork.
Code-conscious
Installation and site work completed in accordance with Ontario requirements.
Our Process
How we plan and deliver soil nail walls
Soil nail wall construction stabilizes an exposed cut with closely spaced steel bars drilled and grouted into retained ground, then connects those bars to reinforced shotcrete facing. Harrowgate installs the complete soil nail system for commercial and heavy-civil excavations across Toronto and the GTA, including drilling, drainage, facing, testing, and staged excavation.
- 01 Send your inquiry, a few photos or a description of the site.
- 02 We come out, assess the site, take measurements, and confirm the scope.
- 03 We complete the soil nail walls on site, to the load and finish the job needs.
- 04 We install it, finish to grade, and clean up, one accountable crew, start to finish.
Local Context
A closer look at soil nail walls
Scope
Understanding soil nail walls
How we deliver soil nail walls
A reliable installation follows the engineered temporary works sequence exactly, because support that is correct in its final configuration can still move or fail during an intermediate stage. We establish controls, install from stable ground, limit exposed soil, activate each support level on time, document concealed work, and release the next excavation stage only after the required checks.
We establish survey control and confirm utility clearances before trimming the first shallow lift. Our drill works from the top down, advancing each nail at the engineered inclination and length before the cut is opened further. We clean the hole, place the centralised threaded bar, grout from the low point to displace air and water, install bearing plates, drainage strips, reinforcing mesh, and shotcrete.
Successive lifts repeat only after the preceding row has reached the required acceptance condition. Where loose seams ravel quickly, we shorten the open-face interval, apply a flash coat, or use temporary casing so the designed ground arch can develop without losing material.
Production records identify nail number, collar elevation, inclination, drilled length, bar size, grout volume, refusal or obstructions, and facing thickness. We coordinate proof and verification testing with the engineer, isolate test nails from production assumptions, and hold excavation when load response or movement differs from the design model. Surface water is intercepted above the cut, weep outlets remain open, and instrumentation readings are reviewed before each deeper stage.
Materials, specs, and Ontario standards
The governing requirements are the sealed project drawings, geotechnical recommendations, Ontario construction regulation, applicable OBC provisions, referenced CSA standards, and any project-specific OPSS clauses. Dimensions and capacities are project values, not rules of thumb. We verify materials, geometry, testing, installation tolerances, temporary loading, groundwater assumptions, inspection points, and removal requirements before affected work is covered.
The engineer sets nail spacing, bar diameter, steel grade, bond length, corrosion protection, grout strength, test load, shotcrete thickness, mesh, and connection plate details. Typical production geometry uses a near-horizontal downward inclination and a regular grid, but fill, weak seams, buried foundations, and property limits can change every row.
Grout is mixed to the approved water-to-cement ratio and placed continuously. Facing thickness is checked with pins and cores where specified, while drain strips and weeps relieve pressure behind the face. Structural steel and concrete work follows the project drawings, applicable OBC provisions, and referenced CSA requirements.
Ontario construction requirements also call for accurate service location before excavation, written precautions from an engineer where adjacent stability may be affected, and a clear area at least 1 metre from the upper edge for equipment, spoil, rock, and materials. The support and site controls are adjusted when actual soil or water differs from the design assumptions.
What goes wrong, and how we prevent it
The failures buyers worry about are excessive wall movement, settlement outside the cut, water inflow, ground loss, damaged utilities, failed inspections, and schedule delays caused by an unbuildable sequence. Prevention depends on observing small deviations early. We compare the work with drawings, logs, surveys, test results, groundwater behaviour, and monitoring trends before a deviation becomes a structural or property problem.
The principal failures are face ravelling before the shotcrete closes the lift, short or poorly grouted bond zones, nails drilled into utilities or neighbouring rights, blocked drainage, excessive deformation, and brittle facing around plates. We prevent them with staged cuts, verified drill alignment, measured grout takes, witnessed load testing, drainage continuity, and movement trigger levels.
Unexpected grout loss can reveal voids or an open seam. A sudden increase in drilling torque can indicate an obstruction. Both are recorded and referred to the engineer before production continues, rather than concealed by a revised log.
Daily coordination covers weather, water, instrument access, loading near the crest, housekeeping, safe entry, and changes by other crews. When a hold point or action level is reached, the affected stage stops. We stabilize the work, verify the observation, involve the engineer, and document the accepted response before continuing.
Have drawings for soil nail walls? Send them over and we will scope it.
FAQ
Soil Nail Walls FAQ
How do you plan soil nail walls?
We plan soil nail walls from the geotechnical information, sealed drawings, excavation or installation sequence, access, nearby assets, groundwater, testing, and the permanent works interface. Production records identify nail number, collar elevation, inclination, drilled length, bar size, grout volume, refusal or obstructions, and facing thickness. The field plan assigns hold points and makes any changed condition visible before the next.
When is an engineered design required?
An engineer-designed system is required when the selected support type, depth, width, soil, water, surcharge, adjacent asset, or project condition falls outside a permitted prescriptive arrangement. Ontario rules also require project-specific engineering for trenches deeper than 6 metres or wider than 3.6 metres. The sealed drawings must remain available and field variations need written review.
What information is needed before mobilization?
We need the latest excavation and structural drawings, geotechnical report, survey, utility information, groundwater data, adjacent foundation details, access limits, property constraints, loading plan, and proposed sequence. For sensitive sites, monitoring requirements and baseline condition records must also be established. Missing information is resolved before it becomes a drilled obstruction or unsupported field condition.
How do you control movement beside an existing building?
Movement control combines a suitably stiff support system, short excavation stages, timely anchors or braces, groundwater management, controlled surcharge, close soil contact, and monitoring. Where the existing footing lies inside the influence zone, underpinning may transfer its load deeper. Survey and instrument trigger levels provide the decision points for holding, stabilizing, or revising the sequence.
What happens when field conditions differ from the report?
We record the location and nature of the difference, protect the excavation in its current stable stage, and notify the engineer. Changes in soil, groundwater, obstructions, footing geometry, or grout response can alter capacity and movement. Work resumes in the affected area only after the design is confirmed or revised for the actual condition.
How is groundwater managed during the work?
Groundwater is managed to the geotechnical and shoring design without causing piping, base instability, erosion, or settlement outside the excavation. Measures may include sumps, filtered wells, wellpoints, cut-off walls, drainage layers, staged pumping, and piezometers. Discharge routes, treatment, permits, standby capacity, and response to power loss are planned before pumping begins.
Can work continue while the facility or roadway remains active?
Often yes, provided the engineered staging, protection, access, traffic control, vibration limits, emergency routes, and monitoring plan support continued operations. We divide the site into controlled work zones and coordinate disruptive activities around operating constraints. The feasibility depends on available clearance, public exposure, utility continuity, equipment movements, and the owner's tolerance for noise and vibration.
What records are provided for closeout?
Closeout records can include layout surveys, installation logs, material tickets, concrete or grout results, anchor or nail tests, weld and connection records where specified, inspection reports, monitoring plots, field changes, photographs, cut-off elevations, abandoned element locations, and removal records. The exact package follows the project specification and gives the owner a traceable account of concealed temporary works.
Still have a question about soil nail walls? Ask our team directly.
Explore
Related Harrowgate services
Excavation shoring, Excavation shoring for deeper or stiffer retained cuts
Anchored support where higher restraint is required, Anchored support where higher restraint is required
Broader stabilization, Broader stabilization for natural and constructed slopes
Movement tracking and trigger-level reporting, Movement tracking and trigger-level reporting
Reinforced facing and local stabilization work, Reinforced facing and local stabilization work
Our Work
View Our Projects See real projects across Toronto & Ontario
Commercial and heavy-civil construction delivered for developers, contractors, property managers, and municipalities.
Get a quote for soil nail walls
Send drawings, a site plan, or a description of the scope. Harrowgate Group is licensed, insured, and WSIB-covered.
Licensed, Insured & WSIB-Covered, work managed and documented on every job
Send your project details
Tell us what you need and we’ll get you a quote. Licensed, insured & WSIB-covered · Free, no-obligation quote & on-site assessment.
Soil Nail Walls Across the GTA
View all service areas →Harrowgate Group provides soil nail walls, delivered and installed with quote-ready support across Toronto and surrounding Ontario communities.
