Column Design Mistakes in Steel Buildings

This article explains the column mistakes that affect steel building pricing, permit documents, foundations, fabrication, and construction. It is written for buyers, contractors, and project teams who need to understand column coordination before final drawings, anchor layouts, concrete work, or field changes are treated as complete.

Steel building columns may look simple. They are vertical members, they support the roof, and they transfer load down to the foundation.

That is only part of the truth.

A column in a pre-engineered steel building can carry axial load, bending, shear, uplift, frame moments, crane forces, mezzanine reactions, bracing forces, impact loads, and construction-stage effects. It can also control door locations, interior clearance, foundation size, anchor design, wall bracing, and future expansion.

Many steel building problems start when columns are treated as isolated posts instead of part of a complete structural system.

Column mistakes can lead to:

• Undersized frames
• Excessive deflection
• Weak-axis instability
• Anchor-bolt problems
• Foundation redesign
• Bracing conflicts
• Door-clearance issues
• Mezzanine or crane limitations
• Retrofit costs
• Permit-review questions
• Field modifications that should never have been made on site

This guide explains the most common column design mistakes in steel buildings, why they happen, and what buyers should confirm before approving the building layout, foundations, mezzanine, crane package, or fabrication release.

Sources and public reference pages reviewed: July 2026

 

Quick Answer

The biggest column design mistakes in steel buildings usually happen when the column is designed or modified without considering the full load path.

Common mistakes include:

• Selecting columns from building size alone
• Ignoring bending and combined axial load
• Underestimating unbraced length and column stability
• Treating endwall, sidewall, and main-frame columns as interchangeable
• Moving overhead doors after the column grid is set
• Removing flange braces or wall restraints
• Adding mezzanines, cranes, solar loads, or equipment after engineering
• Designing foundations from preliminary reactions
• Misunderstanding anchor bolts and base plates
• Ignoring impact protection, corrosion, fire protection, or serviceability
• Making field cuts, welds, holes, or connection changes without engineering review

In Canada, steel building columns must be designed using the building code and referenced structural standards applicable in the project jurisdiction; Codes Canada provides access to the National Model Codes, but the legally applicable edition still depends on provincial or territorial adoption, local amendments, project use, and authority requirements.

The applicable edition of the National Building Code, CSA S16, and related standards depends on provincial or territorial adoption, local amendments, project use, and authority requirements.

A column should therefore be reviewed as part of the full steel building system, not as a standalone vertical post.

 

Steel Building Column: Practical Definition

A steel building column is a vertical structural member that transfers loads from the roof, walls, frames, openings, mezzanines, cranes, bracing, and other connected systems into the base plate, anchors, foundation, and supporting soil.

That definition matters because the column is not only a post. It is part of the full load path between the building system and the ground.

 

A Steel Building Column Is Part of a System

A column does not work alone.

A steel building column may connect to:

• Rafters
• Haunches
• Endwall framing
• Sidewall girts
• Roof purlins
• Flange braces
• Wall bracing
• Portal frames
• Mezzanine framing
• Crane brackets
• Base plates
• Anchor bolts
• Concrete foundations
• Cladding and trim systems

Loads can pass through these elements in more than one direction.

For example, wind acting on a sidewall may push load into girts, then into columns, then into the base plates, anchors, foundations, and supporting soil. Snow load may move through roof panels, purlins, rafters, haunches, columns, and foundations. A mezzanine may add vertical and horizontal reactions into the column at an intermediate height.

That is why a column cannot be selected only by looking at building height and roof span.

Tower’s guide to site-specific steel building engineering explains why project location, use, loads, openings, bracing, foundations, and local design criteria must be confirmed before the steel system is treated as final.

Its design depends on:

• Project location
• Building geometry
• Bay spacing
• Column spacing
• Structural system
• Roof and wall loads
• Snow, wind, rain, and seismic criteria
• Doors and framed openings
• Bracing layout
• Mezzanines
• Cranes
• Collateral loads
• Equipment loads
• Foundation type
• Serviceability limits
• Future expansion plans

The column is one link in the building’s load path. If that link is changed, the forces do not disappear. They move somewhere else.

 

Mistake 1: Designing Columns From Building Size Alone

A 60 × 100 building does not automatically require the same columns in every province, every exposure, every use, or every layout.

Two buildings with identical dimensions may need different column designs because they have different:

• Snow loads
• Wind exposure
• Seismic conditions
• Importance category
• Door openings
• Frame spacing
• Roof slope
• Eave height
• Interior loads
• Crane or mezzanine requirements
• Bracing layout
• Foundation assumptions

A farm storage building, public commercial building, equipment shop, warehouse, and industrial service building can impose different design demands even when their footprint is similar.

A column designed for one building should not be copied into another project because the dimensions look close.

The correct starting point is not “What column size is needed for this span?”

The better question is:

What forces must this column resist in this specific building, at this specific site, with this specific use and layout?

 

Mistake 2: Treating Columns as Pure Compression Members

Many people think columns only carry vertical compression.

Some columns do primarily carry compression, but many steel building columns also resist bending, shear, uplift, and combined loading.

A rigid-frame column may resist:

• Roof gravity loads
• Snow loads
• Wind loads
• Frame moments
• Horizontal shear
• Uplift
• Second-order effects
• Base reactions from frame action

An endwall column may resist:

• Wind on the endwall
• Wall girt reactions
• Door-frame loads
• Roof loads near the end bay
• Bracing or collector forces where applicable

A mezzanine column may resist:

• Floor gravity loads
• Lateral loads from bracing
• Guard or barrier loads
• Equipment reactions
• Base shear
• Moment where the base or framing is designed for it

A column under axial compression and bending must be designed for the combined effect, not checked as two unrelated problems.

This is especially important when:

• The building has tall eaves
• Large doors are placed near columns
• Bracing is interrupted
• A portal frame is used
• Crane brackets are attached
• A mezzanine connects at mid-height
• The foundation restrains or releases the base differently than assumed

A column that appears adequate for compression alone may not be adequate under combined axial load and bending.

 

Mistake 3: Ignoring Column Stability and Unbraced Length

Column strength is not only about steel area.

A long slender column can buckle before the steel reaches its material strength.

Column stability depends on:

• Unbraced length
• End restraint
• Weak-axis and strong-axis behaviour
• Frame stiffness
• Second-order effects
• Bracing locations
• Girt and purlin restraint
• Flange braces
• Load direction
• Initial imperfections
• Connection assumptions

A column may be stable in one direction but vulnerable in another.

For example, wall girts may provide restraint in one plane, while the weak axis depends on flange braces, bracing, or frame action. If those restraints are omitted, moved, or installed incorrectly, the column may not behave as designed.

Modern steel design must consider frame stability, column effective length, second-order behaviour and the actual restraint conditions according to the applicable standard and analysis approach.

Where the NBC 2020 design basis applies, CSA S16:19 provides rules and requirements for structural steel members, frames, connections, fabrication, and erection; the adopted edition must still be confirmed for the project jurisdiction.

Effective-length assumptions must match the real frame system, bracing, connection behaviour and installed restraints. A point in a bending diagram should not be treated as a lateral brace unless physical bracing or restraint is actually provided.

Field crews should not remove flange braces, girts, or bracing members because they appear secondary. Those components may be part of the restraint system assumed in the column design.

 

Mistake 4: Confusing Main-Frame Columns, Endwall Columns, and Interior Columns

Not every column in a steel building performs the same job.

Main-Frame Columns

Main-frame columns are part of the primary rigid frame. They typically work with the rafters and haunches to resist gravity and lateral loads across the building width.

They can carry:

• Large vertical reactions
• Frame moments
• Wind reactions
• Snow and rain effects
• Base shear and uplift
• Building sway effects

Endwall Columns

Endwall columns often support wall girts and transfer wind loads from the endwall. Their design may differ significantly from the main frames.

An endwall designed for future expansion may also be different from a permanent endwall.

Sidewall Columns

Sidewall columns or secondary wall columns may support wall framing, openings, or local cladding loads. They may also interact with bracing or portal frames.

Mezzanine Columns

Mezzanine columns can create concentrated reactions inside the building. Their foundations and base plates may be completely different from the main building columns.

Crane Columns or Bracketed Columns

Columns supporting crane brackets, runway beams, or equipment can have additional vertical, horizontal, impact, fatigue, and serviceability demands.

A column type used in one location should not be substituted into another location without structural review.

 

Mistake 5: Setting Door Locations Before Understanding Column and Bracing Requirements

Large overhead doors are one of the most common causes of column and bracing problems.

A door can affect:

• Column spacing
• Jamb framing
• Header size
• Portal frame requirements
• Wall bracing locations
• Foundation reactions
• Girt layout
• Cladding and trim
• Vehicle clearance
• Erection sequence

A wide door may require reinforced jambs, deeper headers, heavier columns, or a portal frame if it interrupts a braced bay.

Moving a door after the steel package is engineered can create a chain reaction:

1. Door moves into a braced bay
2. Bracing must move or be replaced with another system
3. Column forces change
4. Base plates and anchors change
5. Foundation reactions change
6. Permit drawings become inconsistent
7. Fabrication may need revision

The door schedule should be finalized before engineering is treated as complete.

Tower’s guide to how design changes affect steel building pricing explains why late changes to openings, framing, bracing, reactions, anchors, and foundations can create redesign, fabrication, and cost risk.

Framed openings should be frozen before final drawings, base plates, anchors, and foundation reactions are treated as complete.

A good buyer question is:

Are any overhead doors, walk doors, windows, or equipment openings conflicting with required columns, bracing, or portal framing?

 

Mistake 6: Moving Columns to Improve Interior Clearance Without Redesign

Column-free space has value.

But removing or moving a column is not just a layout change.

Changing column spacing can affect:

• Rafter size
• Frame moments
• Base reactions
• Deflection
• Bracing bay locations
• Purlin and girt spans
• Cladding support
• Erection weight
• Foundation size
• Transportation limits
• Fabrication cost

Wider spacing may reduce the number of frames, but it can increase the size and cost of each frame.

Closer spacing may use more frames but reduce individual member demands.

The most economical layout depends on the full building, not only the number of columns.

Column spacing should be coordinated with:

• Vehicle movement
• Storage racks
• Equipment
• Floor drains
• Future partitions
• Mezzanine columns
• Crane clearances
• Door approaches
• Foundation locations

The cheapest column grid structurally may not be the best operating layout, and the most open layout may not be the best total-cost solution.

 

Mistake 7: Removing Flange Braces or Wall Restraints

Some of the most important column restraint components do not look impressive.

Flange braces, girts, bridging, and other restraints may be essential to column capacity.

They can help prevent:

• Lateral movement
• Weak-axis buckling
• Flange instability
• Rotation
• Excessive frame deformation

Problems occur when these members are removed or altered for:

• Interior liner panels
• Insulation
• Electrical conduit
• Shelving
• Mechanical equipment
• Office partitions
• Finished wall systems
• Door hardware
• Pipe routing

A field installer may assume a small brace is only temporary or only for alignment.

That assumption can be dangerous.

If a brace or restraint appears to conflict with interior work, the correct action is not to remove it. The correct action is to ask whether that component is part of the engineered restraint system.

Tower’s guide to steel building bracing systems explains why flange braces, wall bracing, roof-plane bracing, and collector elements cannot be treated as interchangeable components.

 

Mistake 8: Ignoring Base Plates, Anchor Bolts, and Column Base Assumptions

A column does not end at the floor line.

Its force must transfer into:

• Base plate
• Anchor bolts
• Grout
• Concrete pedestal or footing
• Reinforcing steel
• Foundation system
• Supporting soil

The base may need to resist:

• Compression
• Shear
• Uplift
• Overturning
• Moment
• Anchor tension
• Anchor shear
• Bearing pressure
• Prying effects where applicable

A column base may be designed as pinned, fixed, partially restrained, or detailed for project-specific assumptions. Those assumptions affect both the steel frame and the foundation.

Mistakes happen when:

• Anchor bolts are placed from preliminary drawings
• Anchor sizes are changed in the field
• Base plates are modified
• Holes are enlarged without review
• Grout is omitted or installed incorrectly
• Column bases are shimmed improperly
• Anchor embedment is not coordinated
• Foundation design uses outdated reactions

An anchor-bolt error can delay erection even when the steel columns themselves are correctly designed.

Anchor layout should be coordinated using the final base-plate and anchor information, not an early pricing sketch.

 

Mistake 9: Designing Foundations From Preliminary Column Reactions

Foundation design should be based on final coordinated steel-system reactions, site and geotechnical information, applicable load combinations, frost and site conditions, and the responsible foundation engineer’s design basis.

Preliminary reactions can change when the project changes:

• Door sizes
• Bay spacing
• Building height
• Roof slope
• Insulation or ceiling load
• Solar loads
• Snow-drift assumptions
• Mezzanine loads
• Crane loads
• Bracing layout
• Portal frames
• Moment-resisting frames
• Column base assumptions

If the foundation engineer receives early reactions and the steel building later changes, the foundations may no longer match the final building.

This can lead to:

• Footings that are too small
• Anchors in the wrong location
• Inadequate uplift resistance
• Inadequate shear resistance
• Base plates that do not fit
• Delayed inspections
• Concrete demolition or retrofit
• Permit resubmission

The foundation engineer should receive the final:

• Column grid
• Base-plate dimensions
• Anchor sizes and layout
• Gravity reactions
• Lateral reactions
• Uplift reactions
• Moment reactions where applicable
• Load combinations
• Bracing and portal-frame reactions
• Crane or mezzanine reactions
• Soil and frost information

Tower’s steel building foundation design guidance explains why the concrete system must be coordinated with final steel reactions, anchor information, soil conditions, and site-specific foundation design.

 

Mistake 10: Adding a Mezzanine After Column Design Is Complete

A mezzanine can completely change the column strategy.

It may add:

• Interior columns
• Beam reactions into main columns
• Lateral bracing requirements
• Floor diaphragm action
• New base plates and anchors
• Concentrated foundation loads
• Stair and guard loads
• Occupant loads
• Fire and accessibility requirements
• Vibration and serviceability demands

If the mezzanine connects to the main steel building columns, those columns may require additional capacity, reinforcement, connection plates, and foundation resistance.

If the mezzanine is independent, it can still conflict with:

• Braced bays
• Door paths
• Vehicle movement
• Column bases
• Floor drains
• Services
• Interior clearances

A future mezzanine allowance must be defined. A vague note saying “possible future mezzanine” is not the same as designing for a known load, elevation, grid, and connection condition.

Tower’s guide to mezzanine design in steel buildings explains why mezzanine loads, columns, foundations, bracing, fire protection, and permit scope should be resolved before final fabrication where possible.

 

Mistake 11: Adding Cranes or Heavy Equipment After the Columns Are Sized

Cranes and heavy equipment can create forces that standard building columns may not be designed to resist.

Crane-related effects can include:

• Vertical wheel loads
• Horizontal surge
• Longitudinal forces
• Impact factors
• Repeated loading
• Serviceability limits
• Runway alignment requirements
• Bracket forces
• Fatigue considerations where applicable
• Foundation reactions

Equipment can create:

• Concentrated support loads
• Dynamic forces
• Vibration
• Torque
• Impact
• Maintenance loads
• Anchorage demand

A crane bracket welded or bolted to a column after fabrication is not a minor accessory.

It can require review of:

• Column strength
• Web and flange capacity
• Local reinforcement
• Connection design
• Deflection
• Bracing
• Foundations
• Fatigue or repeated loading
• Erection and access

If a crane, jib, hoist, conveyor, or heavy machine may be installed later, it should be disclosed during the initial design phase.

 

Mistake 12: Ignoring Column Deflection and Building Serviceability

A column may be strong enough to resist load but still move too much.

Serviceability problems can include:

• Door binding
• Cladding distortion
• Cracked interior finishes
• Misaligned overhead doors
• Excessive sway
• Vibration complaints
• Crane runway alignment problems
• Damage to brittle wall systems
• Water leakage at envelope interfaces

Strength checks prevent failure. Serviceability checks help the building perform acceptably.

Tall columns, long spans, large doors, light wall systems, cranes, mezzanines, and sensitive interior finishes can make serviceability more important.

The owner should identify:

• Overhead door tolerances
• Interior wall finishes
• Crane runway expectations
• Office areas
• Equipment sensitivity
• Liner panels
• Curtain walls or glazing
• Any function that is sensitive to movement

A building designed only to minimum strength criteria may still disappoint the owner if movement-sensitive uses were not disclosed.

 

Mistake 13: Overlooking Impact, Collision, and Operational Damage

Some columns are located where they can be hit.

Common risk zones include:

• Loading bays
• Forklift aisles
• Truck doors
• Wash bays
• Repair shops
• Agricultural equipment storage
• Material-handling areas
• Recycling or industrial facilities
• Warehouses with racking

A column can be structurally adequate for design loads and still be vulnerable to accidental impact.

The design and layout may need:

• Bollards
• Guards
• Curbs
• Raised pedestals
• Setbacks from vehicle paths
• Heavy-duty base protection
• Operational controls
• Clear aisle planning

Impact protection is not only a safety issue. It can also protect the owner from expensive structural repair and downtime.

A column directly beside a high-traffic overhead door should be discussed before the layout is approved.

 

Mistake 14: Ignoring Corrosion, Moisture, and Interior Environment

Columns in some steel buildings are exposed to more than dry indoor air.

Corrosion risk can increase in:

• Wash bays
• Livestock buildings
• Fertilizer storage
• Salt storage
• Coastal environments
• Recycling facilities
• Food-processing areas
• High-humidity buildings
• Buildings with poor drainage
• Unheated spaces with condensation cycles

Corrosion protection may affect:

• Paint or coating system
• Galvanizing
• Column-base detailing
• Drainage
• Separation from concrete or chemicals
• Maintenance access
• Cladding and liner choices
• Fireproofing compatibility

A column base is often one of the most vulnerable areas because water, salts, cleaning chemicals, or debris can accumulate near the floor.

The intended environment should be disclosed before finish, base detail, and maintenance assumptions are finalized.

 

Mistake 15: Forgetting Fire Protection and Occupancy Requirements

Steel columns may require fire protection depending on the building classification, occupancy, size, fire separations, sprinkler status, and applicable code provisions.

Fire protection can affect:

• Column encasement
• Spray-applied fire-resistive material
• Intumescent coating
• Board systems
• Fire-rated walls
• Connections
• Inspection
• Maintenance
• Interior layout

A column that is acceptable structurally may still require protection for the building’s fire and life-safety strategy.

This becomes especially important when the building includes:

• Offices
• Public access
• Mezzanines
• Mixed occupancies
• Fire separations
• Hazardous materials
• Repair or service uses
• High-value storage
• Occupant areas above the main floor

Fire protection should be reviewed through the applicable building code, occupancy, building size, fire separations, sprinkler status, design path, authority having jurisdiction, and responsible fire or building-code professionals.

Fire protection should not be treated as a cosmetic finish added after the steel design is complete.

 

Mistake 16: Making Field Modifications Without Engineering Review

Field changes to columns can be serious.

Do not make the following changes unless they have been reviewed and accepted in writing by the responsible professional:

• Cutting a column
• Drilling new holes
• Enlarging holes
• Welding tabs or brackets
• Changing weld size, weld length, or weld location
• Removing stiffeners
• Removing flange braces
• Changing base plates
• Relocating anchors
• Heating or bending steel
• Grinding connection areas
• Attaching cranes or hoists
• Adding mezzanine connections
• Installing large signs or equipment
• Changing column-base grout or shims
• Modifying bracing connections

A field change may appear small but affect strength, stability, fatigue, corrosion protection, fire protection, or connection behaviour.

The correct question is not “Can the installer make it fit?”

The correct question is:

Does the modified column still satisfy the engineered design and written project requirements?

 

Mistake 17: Assuming Steel Building Certification Replaces Project Design Review

Steel building system standards and certifications can be important, but they do not eliminate project-specific design.

A certified steel building system still needs to be designed for:

• Actual project location
• Applicable loads
• Building use
• Openings
• Column grid
• Bracing
• Foundations
• Mezzanines
• Cranes
• Energy or fire requirements where applicable
• Permit authority requirements

CSA A660 certification, CSSBI steel building system standards, and manufacturer quality procedures should not be misunderstood as automatic approval for every site.

For buyers comparing steel building suppliers, Tower’s CSA A660 certification guide explains why manufacturer certification supports quality control but does not replace project-specific engineering, local permit review, or AHJ approval.

The authority having jurisdiction still reviews the project according to the applicable code, local requirements, and submitted documents.

 

Column Design Mistakes and Their Consequences

Mistake	Possible consequence
Designing from building size alone	Undersized or inefficient columns because site loads and use were missed
Ignoring bending and combined loading	Column appears adequate in compression but fails the real design condition
Underestimating unbraced length	Buckling or excessive movement risk
Treating column types as interchangeable	Wrong member used for main frame, endwall, mezzanine, or crane condition
Moving doors late	Bracing, column, base plate, anchor, and foundation redesign
Removing flange braces	Loss of restraint assumed in the column design
Using preliminary reactions for foundations	Footings, anchors, or base plates do not match final steel design
Adding mezzanines later	Main columns and foundations may lack required capacity
Adding cranes later	Bracket, fatigue, lateral force, and serviceability problems
Ignoring deflection	Door, cladding, crane, and finish performance issues
Ignoring impact protection	Operational damage to columns in traffic areas
Ignoring corrosion or fire protection	Durability, code, and maintenance problems
Making field modifications	Unapproved changes to the structural load path

 

Information Needed Before Column Design Is Finalized

A reliable steel building column design depends on complete project information.

Before final engineering, confirm:

1. Project location
2. Building use
3. Width, length, and eave height
4. Roof slope
5. Bay spacing and column grid
6. Main door sizes and locations
7. Walk doors and windows
8. Building importance category
9. Snow, wind, rain, and seismic criteria
10. Roof insulation, ceiling, and collateral loads
11. Wall liner systems or interior finishes
12. Mezzanines or future mezzanine allowance
13. Cranes, hoists, or equipment loads
14. Solar panels or roof-mounted equipment
15. Bracing layout
16. Portal or moment-resisting framing
17. Column-base assumptions
18. Foundation type and soil information
19. Corrosion or moisture exposure
20. Fire-protection requirements
21. Vehicle or equipment impact risks
22. Future expansion plans

Unknowns should be identified as unresolved. They should not be replaced with convenient assumptions.

 

Column Coordination Checklist Before Fabrication

Item	Confirmed?	Why it matters
Final column grid	Yes or no	Controls frames, doors, bracing, foundations, and cladding
Building use	Yes or no	Affects loads, occupancy, fire, serviceability, and permits
Door layout	Yes or no	Prevents conflicts with columns, braces, and portal frames
Bracing layout	Yes or no	Provides column restraint and lateral-force transfer
Mezzanine loads	Yes or no	Can add reactions to columns and foundations
Crane loads	Yes or no	Can control column, bracket, and foundation design
Base plates and anchors	Yes or no	Must match final reactions and erection requirements
Foundation reactions	Yes or no	Needed before concrete design is finalized
Serviceability criteria	Yes or no	Controls deflection, sway, door operation, and crane alignment
Fire protection	Yes or no	May affect column finish, encasement, or rated assemblies
Corrosion exposure	Yes or no	Affects coating, galvanizing, base detailing, and maintenance
Impact protection	Yes or no	Protects columns in vehicle and equipment zones
Erection and temporary stability requirements	Yes or no	Columns and frames may need temporary support before the permanent bracing, purlins, girts, and cladding systems are complete
Future expansion	Yes or no	May change endwalls, columns, bracing, and foundations
Field modification controls	Yes or no	Prevents unapproved cutting, drilling, welding, or brace removal

 

Questions Buyers Should Ask About Steel Building Columns

1. Are the columns designed for the confirmed project location and use?
2. Are the main-frame, endwall, sidewall, and mezzanine columns clearly identified?
3. Do large overhead doors conflict with columns or bracing?
4. Are the columns designed for combined axial load, bending, shear, uplift, and stability where applicable?
5. What members provide column restraint?
6. Are flange braces or girts required for column capacity?
7. Have mezzanine, crane, solar, or equipment loads been included?
8. Are the column-base assumptions clear?
9. Have final reactions been sent to the foundation engineer?
10. Are anchor-bolt layouts based on final base-plate drawings?
11. Are impact, corrosion, and fire-protection risks addressed?
12. What field modifications are prohibited without written engineering review?

These questions should be answered before the steel package is released for fabrication.

A steel building engineering review checklist can help confirm the column grid, bracing, reactions, base plates, anchors, foundations, mezzanine loads, crane loads, serviceability, corrosion exposure, fire protection, and field-modification controls before release.

 

How Tower Steel Buildings Coordinates Column Design

Tower Steel Buildings primarily supplies project-specific steel building kits and packages.

Depending on the written quotation, Tower may provide or coordinate steel-system information such as:

• Main-frame column layout
• Endwall and sidewall column layout
• Bay spacing
• Building height
• Roof and wall framing
• Bracing and restraint locations
• Portal or moment-resisting framing where required and included
• Framed openings
• Mezzanine coordination where included
• Crane or equipment load coordination where disclosed and included
• Structural reactions
• Base-plate information
• Anchor geometry
• Steel-building-system drawings
• Revisions affecting foundation inputs

The final system is developed around the confirmed project location, dimensions, use, openings, loads, and written scope.

Tower does not automatically control or provide:

• Development or building permits
• Final foundation design unless included in the written quotation
• Existing-slab or existing-foundation verification
• Fire-protection design
• Corrosion engineering outside the quoted scope
• Contractor means and methods
• Erection work outside the written scope
• Temporary bracing and erection stability outside the quoted scope
• Unapproved field modifications
• Loads or equipment not disclosed during design
• Permit approval by the authority having jurisdiction

Column layout, reactions, base plates, anchor information, foundation responsibilities, and construction scopes should be confirmed in writing before fabrication.

 

Reviewed by Engineering Team

This content has been reviewed by the Tower Steel Buildings Engineering Team.

Technical review completed: July 2026

 

Official and Technical References

This guide was prepared using Canadian model codes, structural standards, and supplementary Canadian and industry technical resources, including:

• National Research Council of Canada, National Building Code of Canada 2020
• National Research Council of Canada, National Building Code of Canada 2025
• National Research Council of Canada, Structural Commentaries for NBC 2020 Part 4, where applicable
• Canadian Board for Harmonized Construction Codes, provincial and territorial adoption information for National Model Codes
• CSA Group, applicable referenced edition of CSA S16, Design of Steel Structures or Design and Construction of Steel Structures, as adopted for the project jurisdiction
• CSA Group, CSA S16:19, Design of Steel Structures, where the NBC 2020 design basis applies
• CSA Group, CSA S16:24, Design and Construction of Steel Structures, where the NBC 2025 design basis applies
• CSA Group, applicable referenced edition of CSA S136, North American Specification for the Design of Cold-Formed Steel Structural Members
• CSA Group, applicable referenced edition of CSA A23.3, Design of Concrete Structures
• CSA Group, applicable referenced edition of CSA A660, Certification of Manufacturers of Steel Building Systems, for manufacturer certification and certificate/design-manufacturing conformance requirements for steel building systems, not automatic building permit approval, final erected-state inspection, or replacement of project-specific engineering and AHJ review
• Canadian Institute of Steel Construction, Handbook of Steel Construction, 12th Edition, 2nd Revised Printing
• Canadian Institute of Steel Construction, Code of Standard Practice for Structural Steel, 9th Edition
• Canadian Sheet Steel Building Institute, CSSBI 30M-2017, Standard for Steel Building Systems
• Canadian Sheet Steel Building Institute, Steel Building Systems Resources

Public standard pages, code publisher pages, and recognized industry reference pages were used to confirm the source titles, scope, and relevance. Full project design must use the complete applicable standard editions, adopted code edition, local amendments, contract documents, and the responsible professionals’ stamped project-specific design.

The National Building Code is a model code and does not automatically apply in every Canadian jurisdiction upon publication. The applicable code edition, referenced edition of CSA S16, design criteria, permit requirements, fabrication requirements, erection responsibilities, and inspection obligations depend on provincial or territorial adoption, municipal requirements, project use, contract documents, and the authority having jurisdiction.

Column design, column-base assumptions, anchor coordination, foundation design, erection procedures, temporary stability, fire protection, corrosion protection, and field modifications must be addressed by the parties responsible for those scopes.