Metal Decking

Introduction

Metal decking is a critical component in modern construction, particularly for buildings that require strength, fire resistance, and cost-effective concrete reinforcement. Whether you're working on commercial floors, industrial mezzanines, or multi-story residential buildings, understanding metal decking types, materials, spans, and manufacturers is key to making informed project decisions.

In this guide, we’ll explore:

• Common materials and coatings

• Metal deck profile types

• Sizing and span capacity

• Installation process

• Usage with concrete in composite flooring systems

• Top manufacturers in the U.S. and globally

What Is Metal Decking?

Metal decking refers to sheet metal panels, typically galvanized steel, used as structural support for concrete slabs or roofing systems. It acts as a permanent formwork for concrete in composite floor systems and provides lateral stability.

Materials Used in Metal Decking

Most metal decking is fabricated from:

• Galvanized Steel (G60 or G90 coating): The most common, offering corrosion resistance.

• Galvalume (aluminum-zinc coated steel): Enhanced corrosion protection, ideal for coastal or humid climates.

• Cold-Rolled Steel: For higher tensile strength applications.

• Stainless Steel: For special environments (e.g., chemical plants or marine applications).

• Painted Steel or Primed Coated Decking: Often used in visible ceiling systems for aesthetics and additional protection.

Material Gauges

Metal deck thickness ranges from:

• 22 gauge (0.0299") – light-duty

• 20 gauge (0.0358") – standard for most concrete decking

• 18 gauge (0.0474") – heavy-duty spans

• 16 gauge (0.0598") – for long spans or high loads

Common Metal Deck Profile Types

There are three main types of structural metal deck used with concrete:

1. Form Deck (Non-Composite)

• Used only as a concrete form

• Does not bond structurally with concrete

• Often used in short-span slab systems

2. Composite Deck

• Designed to bond with concrete via embossments and ribs

• Carries shear between the steel and concrete slab

• Increases load capacity and reduces overall floor thickness

3. Cellular Deck

• Features a flat bottom surface (used for aesthetics or cable management)

• Available as form or composite deck

• Can integrate lighting and utilities

Metal Deck Sizes and Dimensions

Metal decking comes in standardized widths and depths:

How Far Can Metal Decking Span?

Span depends on profile depth, gauge, and whether shoring is used. Here's a general guide:

Always consult manufacturer span tables based on specific concrete thickness and loading conditions.

How to Install Metal Decking

Step-by-Step Installation:

1. Layout & Planning
   Start with approved drawings. Ensure joists or beams are aligned and ready for deck attachment.

2. Placing the Deck
   Panels are lifted and placed on supports using cranes or forklifts. Workers begin fastening from one end.

3. Fastening the Panels
   Use:

   • Welds

   • Screws

   • Pneumatic pins (like Hilti or Ramset)

4. Side-Lap Connections
   Panels are overlapped and connected using:

   • Button punch tools

   • Stitch screws

5. Shear Stud Installation (for composite decks)
   After decking is fastened, shear studs are welded through the deck to connect concrete slab and beams.

6. Pouring Concrete
   Once reinforcement and edge forms are in place, concrete is poured and leveled.

How Do You Use Metal Floor Decking for Concrete?

When used in composite systems, metal floor decking forms a key part of a structural slab:

• Acts as a working platform during construction

• Forms the base for pouring concrete

• Bonds with concrete to support live and dead loads

• Reduces the need for temporary shoring

Decking can also include embossments to enhance bond strength and cellular sections to accommodate conduits or aesthetic ceilings.

Industries That Use Metal Decking

Metal decking is widely used in:

• Commercial Buildings (office towers, malls, schools)

• Industrial Structures (warehouses, plants, factories)

• Residential High-Rises (multistory apartments)

• Infrastructure Projects (stadiums, transportation hubs)

• Parking Garages (as composite slab formwork)

Main Manufacturers in the USA

1. ASC Steel Deck

2. New Millennium Building Systems

3. Canam Steel Corporation

4. Wheeling-Nisshin

5. Nucor Building Systems

6. Verco Decking, Inc.

7. Centria

8. ClarkDietrich Building Systems

9. Cordeck

10. Metal Deck Supply

Top 20 Metal Decking Manufacturers Globally

1. Kingspan Group (Ireland)

2. Tata Steel (UK/India)

3. BlueScope Steel (Australia)

4. ArcelorMittal Construction (Luxembourg)

5. Ruukki Construction (Finland)

6. Metsec (UK)

7. JFE Steel Corporation (Japan)

8. POSCO (South Korea)

9. SSAB (Sweden)

10. Bhushan Power & Steel (India)

11. Dongkuk Steel (South Korea)

12. HADLEY Group (UK)

13. Metroll (Australia)

14. PEMBINAAN PENTA (Malaysia)

15. Everdeck (UAE)

16. Zamil Steel (Saudi Arabia)

17. Kirby Building Systems (Kuwait/India)

18. Severstal (Russia)

19. Voestalpine (Austria)

20. Aluform System GmbH (Germany)

Frequently Asked Questions (FAQs)

What’s the difference between form and composite decking?

Form deck supports wet concrete only, while composite deck becomes part of the structural slab once cured.

Can metal decking be used without concrete?

Yes, in roofing applications or mezzanine floors where metal decking alone provides structural support.

How thick is metal decking?

Between 0.0299” (22 gauge) and 0.0598” (16 gauge), depending on profile and load requirements.

What finish is best for corrosion protection?

Galvanized (G90) or Galvalume provides durable corrosion resistance, especially in exposed conditions.

Do you need fireproofing on metal decking?

Composite floors may need additional fireproofing depending on building codes, often applied to the underside.

Conclusion

Metal decking is a powerful, efficient solution for concrete flooring systems in commercial, industrial, and multi-residential construction. With numerous profile types, material grades, and design options, understanding how to select and install the right metal deck is essential for structural performance and cost efficiency.

If you’re sourcing metal decking or roll forming machines to manufacture decking profiles, Machine Matcher can help match you with trusted suppliers globally—whether you need raw materials, custom equipment, or full line solutions.