Single-Span vs Multi-Span \u2014 the First Structural Decision<\/h2>\n![\"Single-span](\"https:\/\/www.vikkins.com\/wp-content\/uploads\/2026\/06\/steel-warehouse-clearspan-vs-multispan.png\")
Two ways to cross the width: one column-free clear span, or several bays sharing internal columns.<\/em><\/figcaption><\/figure>\nEvery warehouse is framed one of two ways across its width, and the choice is a trade-off between open floor and steel weight:<\/p>\n
\n- Single-span (clear-span)<\/strong> \u2014 one rigid portal frame crosses the full width with no internal columns. You get a completely open floor: racking, forklift aisles and automated systems lay out however you like, and the building can be re-purposed later without working around posts.<\/li>\n
- Multi-span<\/strong> \u2014 two or more bays share a line of internal columns. Each frame is smaller and lighter, so for a very wide footprint the total steel weight (and cost) drops \u2014 at the price of columns standing in the floor.<\/li>\n
- The real question<\/strong> \u2014 not \u201cwhich is better\u201d but \u201chow much column-free width does the operation actually need?\u201d Pay for clear span where the floor plan needs it; accept columns where it doesn\u2019t.<\/li>\n<\/ul>\n
How Wide Can a Clear Span Go?<\/h2>\n![\"Clear-span](\"https:\/\/www.vikkins.com\/wp-content\/uploads\/2026\/06\/steel-warehouse-span-ranges.png\")
The frame type follows the width. Past the portal-frame range, trusses carry the span \u2014 column-free widths can exceed 60 m.<\/em><\/figcaption><\/figure>\nThere is no single limit, because the frame type changes as the span grows. As a practical guide:<\/p>\n
\n- Light portal frame (9\u201324 m)<\/strong> \u2014 the workhorse for most warehouses and workshops; the most economical steel per square metre.<\/li>\n
- Heavy \/ tapered portal frame (~24\u201336 m)<\/strong> \u2014 deeper, built-up members carry wider column-free widths where the floor plan demands it.<\/li>\n
- Truss or space frame (36\u201360 m and beyond)<\/strong> \u2014 for large logistics centres, hangars and sorting halls, lattice systems span widths a solid frame can\u2019t reach economically.<\/li>\n
- The principle<\/strong> \u2014 a wider clear span always means a heavier frame. Width is never free; it is bought in steel.<\/li>\n<\/ul>\n
Which members make up that frame is its own decision \u2014 see Viga H vs viga I<\/a> for how the section choice affects span and cost.<\/p>\nWhen a Multi-Span Earns Its Columns<\/h2>\n![\"Large](\"https:\/\/www.vikkins.com\/wp-content\/uploads\/2026\/06\/4.-Vikkins-B-usiness-Park.webp\")
On very large footprints, a multi-span frame can cut steel weight significantly \u2014 the columns sit on grid lines that racking is planned around anyway.<\/em><\/figcaption><\/figure>\nClear span is not always the right answer. On a very large building, internal columns can save a lot of steel for little operational cost \u2014 if they are planned, not accidental:<\/p>\n
\n- Huge footprints<\/strong> \u2014 a 100 m-wide distribution hall as a single clear span is enormously heavy; split into bays, the steel cost falls sharply.<\/li>\n
- Columns on the racking grid<\/strong> \u2014 when internal columns line up with aisle or rack lines, they cost almost nothing in usable floor.<\/li>\n
- Future expansion<\/strong> \u2014 a multi-span layout extends naturally: add another bay alongside without touching the existing structure.<\/li>\n
- Where to avoid them<\/strong> \u2014 operations with automated shuttles, large turning equipment or frequently changing layouts usually justify paying for clear span.<\/li>\n<\/ul>\n
Mezzanines and Clear Height \u2014 More From the Same Footprint<\/h2>\n![\"Cross-section](\"https:\/\/www.vikkins.com\/wp-content\/uploads\/2026\/06\/steel-warehouse-mezzanine-clear-height.png\")
The same shell does two jobs: full clear height for tall racking on one side, a mezzanine for offices or extra storage on the other.<\/em><\/figcaption><\/figure>\nSpan sets the floor plan, but height sets the volume \u2014 and a clear-span box lets you use both:<\/p>\n
\n- Clear height<\/strong> \u2014 the unobstructed height to the underside of the frame decides how tall your racking can go; vertical storage is often cheaper than more floor.<\/li>\n
- Mezzanines<\/strong> \u2014 a steel mezzanine adds an upper floor for offices, light storage or picking without enlarging the building footprint.<\/li>\n
- Plan it into the frame<\/strong> \u2014 mezzanine and crane loads have to be designed into the structure from the start, not bolted on later.<\/li>\n<\/ul>\n
How Span Drives the Cost<\/h2>\n![\"Indicative](\"https:\/\/www.vikkins.com\/wp-content\/uploads\/2026\/06\/steel-warehouse-span-vs-cost.png\")
Indicative only \u2014 not a quote. Steel weight per m\u00b2 climbs with clear span; multi-span keeps it flatter on very wide buildings.<\/em><\/figcaption><\/figure>\nBecause span sets the steel weight, it is the biggest single lever on the price of the frame. A few honest rules of thumb when reading a quote:<\/p>\n
\n- Wider clear span, heavier frame<\/strong> \u2014 steel kg\/m\u00b2 rises with width; the jump is steepest once you pass the economical portal-frame range.<\/li>\n
- Multi-span flattens it<\/strong> \u2014 for very large footprints, internal columns keep steel weight and price down.<\/li>\n
- Span is only part of the number<\/strong> \u2014 eave height, wind and snow loads, crane and mezzanine loads, cladding and freight all stack on top.<\/li>\n
- Buy the span you use<\/strong> \u2014 paying for column-free width you don\u2019t need is the most common way to overspend on a warehouse.<\/li>\n<\/ul>\n
VIKKINS engineers each warehouse frame to the span the operation actually needs \u2014 single clear-span where open floor matters, multi-span where it saves steel \u2014 with members, eave height and loads designed to the site. Everything is built on our sistema de estructura de acero<\/a>, manufactured in ISO\u00a09001 \/ ISO\u00a014001-certified bases, packed for sea freight and delivered to 90+ countries with design, supply and installation support \u2014 engineered from our Montr\u00e9al office for accountability you can reach, and supported in English, Spanish and French. (Planning a plant or workshop? See our industrial steel building solutions<\/a>.)<\/p>\n<\/p>\n
\nConstruyamos algo juntos<\/p>\n
D\u00edganos las dimensiones de su proyecto y su uso: le enviaremos un dise\u00f1o preliminar y un presupuesto en 24 horas. Servicio en ingl\u00e9s, espa\u00f1ol o franc\u00e9s.<\/p>\n
Every warehouse is framed one of two ways across its width, and the choice is a trade-off between open floor and steel weight:<\/p>\n
- \n
- Single-span (clear-span)<\/strong> \u2014 one rigid portal frame crosses the full width with no internal columns. You get a completely open floor: racking, forklift aisles and automated systems lay out however you like, and the building can be re-purposed later without working around posts.<\/li>\n
- Multi-span<\/strong> \u2014 two or more bays share a line of internal columns. Each frame is smaller and lighter, so for a very wide footprint the total steel weight (and cost) drops \u2014 at the price of columns standing in the floor.<\/li>\n
- The real question<\/strong> \u2014 not \u201cwhich is better\u201d but \u201chow much column-free width does the operation actually need?\u201d Pay for clear span where the floor plan needs it; accept columns where it doesn\u2019t.<\/li>\n<\/ul>\n
How Wide Can a Clear Span Go?<\/h2>\n
The frame type follows the width. Past the portal-frame range, trusses carry the span \u2014 column-free widths can exceed 60 m.<\/em><\/figcaption><\/figure>\n There is no single limit, because the frame type changes as the span grows. As a practical guide:<\/p>\n
- \n
- Light portal frame (9\u201324 m)<\/strong> \u2014 the workhorse for most warehouses and workshops; the most economical steel per square metre.<\/li>\n
- Heavy \/ tapered portal frame (~24\u201336 m)<\/strong> \u2014 deeper, built-up members carry wider column-free widths where the floor plan demands it.<\/li>\n
- Truss or space frame (36\u201360 m and beyond)<\/strong> \u2014 for large logistics centres, hangars and sorting halls, lattice systems span widths a solid frame can\u2019t reach economically.<\/li>\n
- The principle<\/strong> \u2014 a wider clear span always means a heavier frame. Width is never free; it is bought in steel.<\/li>\n<\/ul>\n
Which members make up that frame is its own decision \u2014 see Viga H vs viga I<\/a> for how the section choice affects span and cost.<\/p>\n
When a Multi-Span Earns Its Columns<\/h2>\n
On very large footprints, a multi-span frame can cut steel weight significantly \u2014 the columns sit on grid lines that racking is planned around anyway.<\/em><\/figcaption><\/figure>\n Clear span is not always the right answer. On a very large building, internal columns can save a lot of steel for little operational cost \u2014 if they are planned, not accidental:<\/p>\n
- \n
- Huge footprints<\/strong> \u2014 a 100 m-wide distribution hall as a single clear span is enormously heavy; split into bays, the steel cost falls sharply.<\/li>\n
- Columns on the racking grid<\/strong> \u2014 when internal columns line up with aisle or rack lines, they cost almost nothing in usable floor.<\/li>\n
- Future expansion<\/strong> \u2014 a multi-span layout extends naturally: add another bay alongside without touching the existing structure.<\/li>\n
- Where to avoid them<\/strong> \u2014 operations with automated shuttles, large turning equipment or frequently changing layouts usually justify paying for clear span.<\/li>\n<\/ul>\n
Mezzanines and Clear Height \u2014 More From the Same Footprint<\/h2>\n
The same shell does two jobs: full clear height for tall racking on one side, a mezzanine for offices or extra storage on the other.<\/em><\/figcaption><\/figure>\n Span sets the floor plan, but height sets the volume \u2014 and a clear-span box lets you use both:<\/p>\n
- \n
- Clear height<\/strong> \u2014 the unobstructed height to the underside of the frame decides how tall your racking can go; vertical storage is often cheaper than more floor.<\/li>\n
- Mezzanines<\/strong> \u2014 a steel mezzanine adds an upper floor for offices, light storage or picking without enlarging the building footprint.<\/li>\n
- Plan it into the frame<\/strong> \u2014 mezzanine and crane loads have to be designed into the structure from the start, not bolted on later.<\/li>\n<\/ul>\n
How Span Drives the Cost<\/h2>\n
Indicative only \u2014 not a quote. Steel weight per m\u00b2 climbs with clear span; multi-span keeps it flatter on very wide buildings.<\/em><\/figcaption><\/figure>\n Because span sets the steel weight, it is the biggest single lever on the price of the frame. A few honest rules of thumb when reading a quote:<\/p>\n
- \n
- Wider clear span, heavier frame<\/strong> \u2014 steel kg\/m\u00b2 rises with width; the jump is steepest once you pass the economical portal-frame range.<\/li>\n
- Multi-span flattens it<\/strong> \u2014 for very large footprints, internal columns keep steel weight and price down.<\/li>\n
- Span is only part of the number<\/strong> \u2014 eave height, wind and snow loads, crane and mezzanine loads, cladding and freight all stack on top.<\/li>\n
- Buy the span you use<\/strong> \u2014 paying for column-free width you don\u2019t need is the most common way to overspend on a warehouse.<\/li>\n<\/ul>\n
VIKKINS engineers each warehouse frame to the span the operation actually needs \u2014 single clear-span where open floor matters, multi-span where it saves steel \u2014 with members, eave height and loads designed to the site. Everything is built on our sistema de estructura de acero<\/a>, manufactured in ISO\u00a09001 \/ ISO\u00a014001-certified bases, packed for sea freight and delivered to 90+ countries with design, supply and installation support \u2014 engineered from our Montr\u00e9al office for accountability you can reach, and supported in English, Spanish and French. (Planning a plant or workshop? See our industrial steel building solutions<\/a>.)<\/p>\n
<\/p>\n
\nConstruyamos algo juntos<\/p>\n
D\u00edganos las dimensiones de su proyecto y su uso: le enviaremos un dise\u00f1o preliminar y un presupuesto en 24 horas. Servicio en ingl\u00e9s, espa\u00f1ol o franc\u00e9s.<\/p>\n
- Multi-span flattens it<\/strong> \u2014 for very large footprints, internal columns keep steel weight and price down.<\/li>\n
- Mezzanines<\/strong> \u2014 a steel mezzanine adds an upper floor for offices, light storage or picking without enlarging the building footprint.<\/li>\n
- Columns on the racking grid<\/strong> \u2014 when internal columns line up with aisle or rack lines, they cost almost nothing in usable floor.<\/li>\n
- Heavy \/ tapered portal frame (~24\u201336 m)<\/strong> \u2014 deeper, built-up members carry wider column-free widths where the floor plan demands it.<\/li>\n
- Multi-span<\/strong> \u2014 two or more bays share a line of internal columns. Each frame is smaller and lighter, so for a very wide footprint the total steel weight (and cost) drops \u2014 at the price of columns standing in the floor.<\/li>\n