Non Composite Metal Decking Guide Steel Roof Deck Types Sizes Gauges and Applications

Non Composite Metal Decking

Non composite metal decking is a structural steel decking system designed to support loads independently without bonding to concrete. Unlike composite decking, which works together with a concrete slab, non composite deck acts as a standalone structural element.

This type of decking is widely used in roofing systems, mezzanines, and light structural platforms across North America, making it one of the most common decking solutions in commercial and industrial construction.

This guide covers types, sizes, gauges, spans, applications, installation, and performance of non composite metal decking.

What Is Non Composite Metal Decking

Non composite metal decking is a cold formed steel profile designed to carry loads without mechanical interlock with concrete. It functions purely as a structural steel sheet.

Key Characteristics

No Concrete Bonding

Does not rely on shear studs
Works independently of concrete

Structural Function

Supports loads directly
Transfers loads to beams or joists

Common Uses

Roof decking
Mezzanine platforms
Equipment floors

Profile Design

Ribbed steel sheets
Available in multiple depths

Types of Non Composite Metal Decking

B Deck

Profile Details

1.5 inch deep profile
Wide rib design

Applications

Roofing
Light floors

N Deck

Profile Details

3 inch deep profile
Deep rib design

Applications

Long span roofing
Heavy loads

Form Deck

Profile Details

Used as permanent form
Supports concrete during curing

Applications

Non composite floors

Corrugated Deck

Profile Details

Sinusoidal shape
Lightweight

Applications

Light roofing
Temporary structures

Non Composite Deck Sizes and Dimensions

Deck Width

Typically 24 inch to 36 inch

Depth Options

1 inch to 3 inch

Sheet Length

Custom lengths
Typically 6 ft to 40 ft

Rib Spacing

Varies by profile

Gauges and Thickness

Common Gauges

22 gauge light duty
20 gauge standard
18 gauge heavy duty
16 gauge extra heavy duty

Gauge Selection

Based on span
Based on load requirements
Based on structural design

Materials Used

Galvanized Steel

Standard material
Corrosion resistant

Galvalume Steel

Enhanced protection

Painted Steel

Used in exposed applications

Stainless Steel

Used in aggressive environments

Load Capacity and Span

Performance Characteristics

Designed for structural loads
Can span between supports

Typical Span Ranges

Short to long spans depending on profile
N deck supports longer spans than B deck

Load Types

Dead load
Live load
Snow load
Wind load

Applications of Non Composite Metal Decking

Roofing Systems

Commercial buildings
Industrial facilities

Mezzanines

Storage platforms
Equipment floors

Industrial Floors

Non composite slab systems

Temporary Structures

Construction platforms

Installation Process

Step by Step

Place decking sheets
Align panels
Fasten to supports
Install side laps

Fastening Methods

Welding
Self drilling screws
Mechanical fasteners

Installation Best Practices

Proper Alignment

Ensures structural integrity

Secure Fastening

Prevents movement

Overlap Installation

Improves strength

Advantages of Non Composite Metal Decking

Simple installation
No need for shear studs
Cost effective
Versatile applications

Limitations

Lower strength than composite systems
Limited performance in concrete floors
Not ideal for high load composite applications

Common Problems and Solutions

Deflection

Cause

Insufficient thickness

Solution

Increase gauge or reduce span

Corrosion

Cause

Environmental exposure

Solution

Use coated materials

Installation Issues

Cause

Poor fastening

Solution

Follow correct installation methods

Cost of Non Composite Metal Decking

Cost Factors

Gauge thickness
Profile depth
Material
Project size

General Cost Trends

Lower cost than composite decking
Cost increases with thickness

How to Choose Non Composite Metal Decking

Consider Application

Roofing or platform use

Consider Span

Match deck depth to span

Consider Load

Ensure adequate capacity

Consider Environment

Choose proper coating

FAQ Non Composite Metal Decking

What is non composite metal decking
It is steel decking that does not bond with concrete

Where is it used
Roofing, mezzanines, and platforms

What sizes are available
Typically 1 inch to 3 inch depth

What gauge is used
Typically 22 to 16 gauge

Is it structural
Yes it is a structural decking system

Conclusion

Non composite metal decking is a reliable and cost effective solution for roofing and structural applications where concrete interaction is not required. Its simplicity, flexibility, and structural capability make it a core component in steel construction across North America.

Selecting the correct profile, gauge, and span ensures optimal performance and long term durability.