Specialty and Supplementary Engineering

Sepco Consulting Engineers provides licensed structural engineering services across Toronto and the Greater Toronto Area — including North York, Scarborough, Markham, Richmond Hill, Vaughan, Mississauga, Brampton, Etobicoke, and surrounding regions.

(Precision. Integration. Expertise.)

Delivering Insight Beyond Conventional Design

In structural engineering, certain components and systems demand a level of precision and expertise that extends beyond standard practice. These specialized elements — often prefabricated, performance-based, or proprietary — require focused technical attention to ensure they perform exactly as intended within the overall structure.

At Sepco Consulting Engineers, our Specialty and Supplementary Engineering services address these intricate challenges.
Working collaboratively with Structural Engineers of Record (SEORs), architects, fabricators, and contractors, we provide advanced analysis, design clarity, and constructability insight to help deliver efficient, code-compliant, and fabrication-ready solutions.

Defining Specialty Structural Engineering: Joists and Joist Girders

Specialty Structural Engineers (SSEs) are responsible for designing specific, non-standard, or performance-driven components based on criteria defined at the outset of the project by the SEOR. These designs must meet project requirements while aligning with manufacturing and erection methods, ensuring compatibility with the manufacture process and adherence to clearly defined requirements established by the SEOR — a balance of analytical precision and practical constructability.

Sepco Consulting Engineers supports this process by integrating traditional design practice with advanced computational tools and engineering judgment. Our specialists engage early in the design process to ensure that complex components and systems perform as intended — safely, efficiently, and predictably.

Component-Based Specialty Design for Open Web Steel Joists

Modern projects rely on specialized components that demand expert attention. Sepco Consulting Engineers provides detailed design and analysis for:

Cold-Formed Steel Systems – Cold formed steel is used in panelized wall assemblies, infill framing, and enclosure systems, offering flexibility and strength for a variety of building shapes and configurations.
Precast Concrete Elements – Connection detailing, lifting analysis, and handling stresses for manufactured units.
Manufactured Wood Components – Engineered timber members, hybrid connections, and modular assemblies.
Open-Web Steel Joists and Trusses – Design and coordination of joist and steel joist systems, including joists and joist girders as key structural elements for supporting floors and roofs. Joist girders serve as primary framing members, engineered to support equally spaced concentrated loads along their span. Open web steel joists feature top and bottom chords, with top chords and parallel chords forming the main load-bearing framework. Standard joists are valued for their features, such as the ability to support loads over large spans, a variety of shapes (including shaped and slope configurations), and compliance with standards for the Canadian market. Specialty joists, such as gable or barrel joists, are available for unique architectural needs, while CJ Series joists are used in composite floor systems with concrete slabs. The length of each joist or beam is a critical factor in design, affecting load capacity and installation. Joists are ideal for large open spaces, providing strength and versatility, and are often preferred over traditional beam systems for their flexibility and efficient installation. Proper installation and access to facilities are essential for streamlined assembly and project timelines. There are many types of joists and joist girders available, including standard and specialty options, to meet diverse project requirements.
Structural Steel Connections – Advanced design and verification of complex or moment-resisting joints, often using Finite Element Analysis (FEA) to capture load paths and stress distribution accurately and verify global load path continuity within the structural system.
Specialized Foundations – Design of pile caps, micropiles, and earth-retention systems requiring geotechnical collaboration.
Temporary Works / Construction Engineering – Formwork, shoring, lifting devices, and other temporary structures supporting safe construction sequencing.

Modular and Prefabricated Specialty Systems

This work includes modular steel cable tray support systems designed as prefabricated structural assemblies to support long tray runs while improving constructability, fabrication efficiency, and installation sequencing.

Performance and Analytical Specialties

Beyond component design, Sepco Consulting Engineers offers advanced analytical services that enhance safety, resilience, and performance under demanding conditions:

Seismic and Earthquake Engineering – Ductility design and dynamic response modeling in seismic zones, with a focus on energy dissipation and the use of energy-dissipating devices such as dampers to absorb seismic energy and reduce damage. Ground properties and ground motion are critical factors influencing seismic safety and building design, as ground shaking and ground failure, including surface faulting, can significantly impact structures at the Earth's surface. Engineers measure seismic forces, ground motion, and acceleration to assess earthquake intensity and potential damage. The frequency of seismic waves and the natural frequency of each object, including buildings, must be considered to avoid resonance and excessive vibration. Vertical forces and vertical displacement are also key in building response to seismic events, requiring careful design for vertical loads. Understanding fundamental concepts such as vibration, energy dissipation, and the behavior of objects under seismic loading is essential for effective seismic design. For example, base isolation systems are a proven seismic mitigation strategy that decouples a building from ground motion. Shear and moment diagrams are used in structural analysis to evaluate how loads are distributed and to visualize internal forces, including shear forces, in joists and framing systems under seismic and other loads.
Wind Engineering – Aerodynamic analysis of tall or irregular structures for pressure and vibration control.
Fire and Thermal Performance – Assessment of structural capacity under elevated temperature exposure.
Blast and Impact Analysis – Evaluation of extreme loading scenarios to enhance safety and durability.
Fatigue and Fracture Mechanics – Analysis of cyclic loading in steel and aluminum structures.
Finite Element Analysis (FEA) – Advanced simulation of stresses, deformations, and instabilities in complex geometries and materials — one of Sepco Consulting Engineers’s key technical strengths.

Material and System Specialties in Industrial Buildings

Our team provides integrated analysis and detailing for material-specific systems that interface closely with the structural frame:

Façade and Curtain Wall Engineering – Coordination of structural, thermal, and movement requirements for cladding systems.
Structural Glass Engineering – Design and analysis of glass as a structural material, including glass walls, fins, floors, canopies, and balustrades.
Using advanced FEA modeling and lamination analysis, we assess stress, fracture, and redundancy to ensure transparent systems achieve both aesthetic and structural performance goals.
Glass and Aluminum Structures – Design of architectural glazing, balustrades, and lightweight framing.
Masonry Systems – Design and evaluation of reinforced and veneer masonry elements.
Light-Gauge Metal Systems – Optimization and validation of proprietary modular or prefabricated assemblies.

Open Web Steel Joists

Open web steel joists are a foundational element in the construction of modern industrial buildings, warehouses, and commercial structures. Characterized by their lightweight, truss-like design, these steel joists are engineered to efficiently support floors and roofs across large spans, making them ideal for creating expansive, unobstructed spaces within a building. By utilizing open web steel joists, a building project can achieve greater flexibility in layout, accommodating a wide range of uses and equipment without the need for closely spaced columns or heavy beams.

The primary role of steel joists is to transfer the loads from the steel deck or concrete slab above to the building’s main structural frame, including beams and columns. This efficient load distribution is critical in supporting both the dead loads of the structure and the live loads imposed by occupants, equipment, and environmental factors. In industrial and commercial construction, open web steel joists are especially valued for their ability to span significant distances, reducing the number of required supports and maximizing usable floor and roof space.

From a cost perspective, open web steel joists offer a highly economical solution. Their open web configuration minimizes material usage while maintaining structural strength, resulting in lower overall weight and reduced material costs. This not only streamlines the construction process but also simplifies the integration of mechanical, electrical, and plumbing systems, which can pass through the open webs without the need for additional coordination or penetrations.

Whether supporting the roof of a warehouse, the floor of a commercial facility, or the deck of an industrial building, open web steel joists provide the versatility, strength, and efficiency needed for today’s demanding building projects. Their use is a testament to the value of specialized engineering in delivering structures that are both cost-effective and capable of supporting the complex loads and large spans required in the modern built environment.

Supporting and Cross-Disciplinary Expertise

Sepco Consulting Engineers' multidisciplinary experience allows for integrated design collaboration across specialties:

Geotechnical Coordination – Foundation-structure interaction and settlement modeling.
Forensic and Failure Investigation – Root-cause analysis of material or connection failures.
Rehabilitation and Strengthening – Retrofit design using FRP, steel plates, or section enhancement.
Vibration and Dynamic Control – Design for human comfort, equipment sensitivity, or resonance mitigation.
Digital Integration (BIM & FEA) – 3D modeling and analytical coordination for precision and constructability.

Why It Matters for Your Building Project

Specialty and supplementary engineering bridges the gap between concept and fabrication.
It transforms abstract design intent into practical, buildable reality — ensuring that complex components perform precisely as envisioned. This includes confirming that forces are properly transferred between components through a continuous structural load path.

At Sepco Consulting Engineers, our approach combines computational precision, deep industry knowledge, and hands-on constructability understanding. The result is a streamlined design process that minimizes uncertainty and strengthens every stage of project delivery.

A Collaborative Approach

We believe that specialty engineering thrives on early engagement. By involving Sepco Consulting Engineers during design development or fabrication, potential conflicts are resolved before construction — reducing risk, cost, and rework.

Our engineers work closely with SEORs, fabricators, and contractors to deliver clear, efficient, and fabrication-ready solutions that fit seamlessly into the project’s structural framework.

Engineering Beyond the Standard

Specialty and supplementary engineering is more than a supporting service — it’s the bridge between innovative design and reliable construction.
Through a blend of analytical depth, advanced simulation tools, and proven field experience, Sepco Consulting Engineers delivers specialized solutions that bring confidence to complex projects.

Whether it’s connection design, FEA-based analysis, or integrated façade systems, our focus remains the same: precision, performance, and partnership.