NA Construction provides Geotechnical Services that include:

Foundation, Excavations and shoring, Retaining Walls, Slope Stability, Hazard Assessment & Reports, and Storm-water management.

Excavations and shoring

To optimize the usable square footage within a site, many sites within the Lower Mainland are building their structures according to their minimum setback design. Another part of these designs can include the construction of basements which will also allow for even more square footage.


At NA Construction, our team can review your ideas for your proposed structure and work with you to determine a cost-effective solution to safely carry out the excavation and provide a safe working environment for the workers. We aim to provide immediate input when dealing with deep excavations or sites which require heavy temporary shoring. This ensures our ability to inform the client of the future costs associated with carrying out such work. Once all excavations and shoring systems are in place, we ensure that the excavation meets the regulations from Work Safe BC and that the site is safe for workers to enter.


Some examples of excavation shoring methods we typically use include:


  • Shot Crete + Anchoring 

Used during deep vertical excavations in order to stabilize the slopes. It combines the principles of reinforced earth soil nail design and meshed shot Crete.


  • Underpinning 

A method used to strengthen and stabilize the existing foundation’s structure. Underpinning extends the foundation in-depth in order to rest upon a stable stratum or in breadth to distribute its load.


  • Sheet Piles 

Are long, vertical interlocking sections driven into the ground to create a continuous wall? Its application can be permanent or temporary.


  • Temporary Lock Block Walls 

Lock Blocks are interlocking, concrete blocks used to create a wall that stabilizes excavated areas.


  • Trenching 

These boxes act as a safeguard to protect the workers within a trench in the event of a cave-in.



Foundations are responsible to transfer the load of the building or structure to the underlying soil. Characteristics of the soil; type, consolidation, depth, composition, and other factors, determine the ability of the soil to carry the load of the structure. The structure of the project and the characteristics of the soil determines the design of either a Shallow or Deep Foundation. The soil may also require Soil Improvement Techniques to improve the carrying capacity.


Soil Improvement is the process where the soil characteristics change through physical action or by creating a composite soil structure. These techniques are vital when the demand of the structure is greater than the carrying capacity of the soil.


We use different soil improvement techniques:


  • Removal & Replacement: 

Excavation of unsuitable soils and replacement with new compacted fill.


  • Preloading: 

Temporarily, surcharge fill; any load that creates a vertical pressure on the ground surface, covers the natural soil allowing the soil underneath to settle and for construction to once again occur. This particular technique is useful in soft clayey and silty soils because as the fill is putting pressure on them they consolidate together creating a stronger soil.


  • In-situ densification: 

Process of using strong vibrations to density sandy soils.


  • Grouting: 

The injection of grout into the ground to improve the soil.


  • Stabilization using Admixtures: 

Admixtures create artificial cementation of the soil which increases the strength of the soil. The most common admixture is Portland cement, others include asphalt and lime.


  • Reinforcement: 

Tensile reinforcement materials improve the stability and load-carrying capacity of the soil. The most common type is plastic grids due to their durability and minimal cost.


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Retaining walls

Retaining walls are used for many different purposes. Firstly, clients can use them to create larger building areas, to stabilize cuts, or even for purely landscaping purposes. NA Construction has worked with a magnitude of different wall styles. These include segmental blocks, boulders, and even green wall systems. Our team will work with you from preliminary design all the way through to the end of construction. Therefore, NA Construction will be able to ensure that our walls meet your needs and provide a safe area for you to use in the future.

Slope Stability

Construction projects are frequently located on or near the sloping ground. These areas are potentially subject to various kinds of slope instability such as slides, flows, and falls. The failures produce extensive property damage and occasionally result in loss of life. Therefore, Geotechnical engineers frequently need to evaluate existing and proposed slopes to assess their stability. Before issuing a permit for development most Municipalities require a Slope Stability Analysis. These Analyses comprise a geotechnical investigation, computer modelling and analysis of the slope, review of the surroundings, and lab analysis. NA Construction provides the necessary documentation required to fulfill the municipalities’ requirements. NA Construction will also provide you with the necessary mitigating measures, when needed, in order to ensure a safe building area.

Hazard Assessment & Reports

NA Construction conducts hazard assessments and reports to assess the nature, extent, probability, and potential effects of seven identified hazards. NA Construction will complete the hazard report and the documentation of the possible mitigating measures. 

  The seven hazards are:

- Inundation by Flood Waters
- Mountain Stream Erosion and Avulsion
- Debris Flows and Torrents
- Debris Floods
- Landslides
- Snow Avalanches
- Rock Falls


Storm-water Management

Storm-water management is a comprehensive approach used in order to control the surface runoff from rainfall and snowmelt events. It also includes management of the quantity and quality of the water discharged into the city’s infrastructure and the environment.

The development of a site often results in an increase in the amount of hardscape or impermeable surfaces. The additional volumes of water resulting from these surfaces require supplementary management. This development densification is creating strains on the environment. Municipalities do not often have the ability to continuously upgrade their systems to account for the increased flow. Consequently, this leaves developers to deal with the additional storm-water on-site.

NA Construction works with the municipalities’ integrated storm-water management plan to create a feasible and cost-effective solution to discharge the collected storm-water safely. Each management plan is unique as it is dependent on the lot grading and the soil conditions found at each individual site. Though each design plan is different they typically involve the installation of an infiltration system or detention system with controlled release.