What Coil Width Do I Need for a 13/3 Corrugated Roofing Sheet? Full Guide

What Coil Width Do I Need for a 13/3 Corrugated Roofing Sheet? (Full Coil Size Guide)

Short Answer

A standard 13/3 corrugated roofing sheet typically requires a coil width between 820 mm and 900 mm, depending on the required cover width and corrugation depth.

Corrugated profiles use more material than flat sheets because of the continuous wave pattern, but less than deep trapezoidal profiles like IBR. The exact coil width depends on pitch, depth, material thickness, and roll forming tooling.

Why Coil Width Matters in Corrugated Roll Forming

Coil width is critical when forming corrugated sheets due to the continuous wave geometry.

If the coil width is incorrect, the profile will not form properly.

If the coil is too narrow:

• Corrugations will not fully develop
• Profile width will be incorrect
• Sheet may lose structural strength
• Installation issues will occur

If the coil is too wide:

• Excess material waste
• Increased production costs
• Feeding and alignment problems
• Reduced efficiency

Coil width directly affects:

• Roll forming accuracy
• Wave consistency
• Material flow
• Final sheet performance

Correct coil width ensures consistent corrugation and efficient production.

Profile Dimensions & Coil Width Overview

13/3 Corrugated Dimensions (Left Side Concept)

Typical cover width: 660–762 mm (varies by market)
Overall width: approximately 700–800 mm
Corrugation height: approximately 13 mm
Pitch (wave spacing): approximately 76 mm (3 inches)
Profile type: sinusoidal wave

Coil Width & Development (Right Side Concept)

Typical coil width: 820–900 mm
Flat development width: approximately 820–900 mm
Includes: continuous wave formation
Allowance factors: pitch, depth, and thickness
Variation: depends on exact corrugation design

Understanding Coil Width vs Cover Width

One of the most common mistakes is assuming coil width equals finished width.

This is incorrect.

Cover width is the usable installed width.

Coil width is the flat sheet before forming.

In corrugated profiles, the coil must include:

• Wave formation
• Continuous bending
• Material stretch
• Edge overlap

Because of the wave shape, corrugated sheets require additional material compared to flat sheets.

Estimated Development (Flat Blank Width)

Corrugated sheets require development based on wave geometry.

This includes:

• Wave depth
• Pitch spacing
• Continuous bending radius
• Material stretch

Basic concept:

Flat width = cover width + wave development + overlap + bend allowance

Example for 13/3 corrugated:

Cover width: approximately 700 mm
Wave development: approximately 80–120 mm
Overlap: approximately 20–40 mm
Bend allowance: approximately 10–20 mm

This results in a coil width of approximately 820–900 mm.

Why Corrugated Sheets Require More Material

Corrugated sheets use more material due to the wave pattern.

Key reasons:

• Continuous curves increase material length
• Repeated bends add development
• Depth of corrugation increases material usage

However, compared to trapezoidal profiles:

• Corrugated sheets use less material than IBR
• They are simpler to form
• They are highly efficient for lightweight applications

Typical Coil Width Range

Standard 13/3 corrugated: 820–900 mm

Light gauge corrugated: 800–850 mm

Heavy gauge corrugated: 850–920 mm

Exact width depends on profile design and machine setup.

Common Material Thicknesses

Typical thickness range:

0.25 mm – light-duty roofing
0.30 mm – residential use
0.40 mm – standard applications
0.50 mm – commercial use
0.60 mm – industrial use

Thicker materials:

• Require more forming force
• Increase bend allowance
• Slightly increase coil width

Materials Used for Corrugated Roofing

Common materials include:

PPGI (pre-painted galvanized steel)
Galvanized steel (GI)
Galvalume (Aluzinc)
Aluminum

Material behavior affects:

• Flexibility
• Springback
• Surface finish

These can slightly influence coil width requirements.

Industries Using Corrugated Roofing Sheets

Corrugated sheets are one of the most widely used roofing profiles globally.

Common industries include:

Residential roofing
Agricultural buildings
Rural construction
Light industrial buildings
Temporary structures

They are popular because they are:

• Cost-effective
• Easy to manufacture
• Lightweight
• Simple to install

Key Factors That Affect Coil Width

Profile geometry
Wave depth and pitch increase material usage

Material thickness
Thicker material increases bend allowance

Overlap design
Overlap adds to total width

Tooling design
Different machines produce slight variations

Machine setup
Entry guides and forming alignment affect feeding width

Common Mistakes When Selecting Coil Width

Using flat sheet width instead of developed width
Corrugated sheets require additional material

Guessing coil width
Always calculate using profile geometry

Ignoring wave depth
Deeper corrugation requires more material

Not matching machine tooling
Each roll forming machine may require a specific width

Important Engineering Note

The exact coil width for a 13/3 corrugated profile cannot be confirmed without a profile drawing.

Small changes in:

• Wave depth
• Pitch
• Material thickness

can significantly affect the required coil width.

Always confirm using engineering calculations or supplier input.

How to Confirm the Correct Coil Width

To determine the correct coil width, you need:

Profile drawing (DXF or PDF)
Material type
Material thickness
Required cover width
Machine specifications

This ensures:

• Accurate production
• Reduced waste
• Correct machine setup

FAQ – 13/3 Corrugated Coil Width

What happens if the coil width is too narrow?
The corrugation will not fully form and the sheet will lose strength.

Why do corrugated sheets need more material than flat sheets?
Because the wave pattern increases the developed length.

Does thickness affect coil width?
Yes, thicker material increases bend allowance.

Can all 13/3 corrugated sheets use the same coil width?
No, variations in design and tooling will change requirements.

Need Help Confirming Your Coil Width?

Incorrect coil width can lead to material waste, production issues, and higher costs.

Machine Matcher can help you:

Review your profile drawing
Calculate exact coil width and development
Match the correct roll forming machine
Advise on materials and setup

Contact our team to ensure your production is accurate and efficient from the start.