What Coil Width Do I Need for a Box Rib Roof Panel 35/1035? Full Guide

What Coil Width Do I Need for a Box Rib Roof Panel 35/1035? (Full Coil Size Guide)

Short Answer

A standard Box Rib 35/1035 roof panel with a finished cover width of 1035 mm typically requires a coil width between 1150 mm and 1220 mm.

The exact coil width depends on rib geometry, overlap design, material thickness, and roll forming tooling. With a rib height of 35 mm and wider cover width, this profile requires slightly more material than 32/1000 and 34/1000 profiles.

Why Coil Width Matters in Box Rib Roll Forming

Coil width is critical for ensuring correct forming and consistent production.

If the coil width is incorrect, it will lead to immediate issues during manufacturing and installation.

If the coil is too narrow:

• Ribs will not fully form
• Panel width will be reduced
• Side laps will not align correctly
• Structural performance will be compromised

If the coil is too wide:

• Excess material waste
• Increased production costs
• Feeding and tracking issues
• Reduced efficiency

Coil width directly affects:

• Roll tooling performance
• Entry guide alignment
• Material flow
• Final panel accuracy

Correct coil width ensures efficient production, accurate profiles, and reliable installation.

Profile Dimensions & Coil Width Overview

Box Rib 35/1035 Dimensions (Left Side Concept)

Cover width: 1035 mm
Overall width: approximately 1070–1110 mm
Rib height: 35 mm
Pitch: typically 200–260 mm
Profile type: trapezoidal box rib
Overlap: standard side lap

Coil Width & Development (Right Side Concept)

Typical coil width: 1150–1220 mm
Flat development width: approximately 1150–1220 mm
Includes: ribs, bends, and overlap sections
Allowance factors: rib height, thickness, tooling
Variation: depends on profile design

Understanding Coil Width vs Cover Width

A common mistake is assuming the coil width equals the finished panel width.

This is incorrect.

Cover width is the usable installed width.

Coil width is the flat strip before forming.

The coil must include:

• Rib formation
• Bend allowances
• Overlap sections
• Material deformation during forming

This is why a 1035 mm box rib panel requires approximately 1150–1220 mm coil width.

Estimated Development (Flat Blank Width)

The coil width is based on the developed flat width of the box rib profile.

This includes:

• Rib geometry
• Bends and angles
• Side lap
• Material stretch

Basic concept:

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

Example for Box Rib 35/1035:

Cover width: 1035 mm
Rib development: approximately 90–130 mm
Overlap: approximately 30–50 mm
Bend allowance: approximately 20–30 mm

This results in a coil width of approximately 1150–1220 mm.

Why Box Rib 35/1035 Requires Higher Coil Width

This profile is designed for high-strength applications and wider coverage.

It requires more material because:

• Deeper ribs (35 mm)
• Wider cover width (1035 mm)
• Increased structural requirements
• Larger pitch spacing

Compared to other box rib profiles:

• Higher rib height increases development
• Wider panel increases total material usage
• Suitable for demanding environments

Typical Coil Width Range

Standard Box Rib 35/1035: 1150–1220 mm

Light gauge version: 1120–1180 mm

Heavy gauge version: 1180–1250 mm

Exact values depend on profile design and machine setup.

Common Material Thicknesses

Typical thickness range:

0.30 mm – light-duty roofing
0.40 mm – standard roofing
0.50 mm – commercial applications
0.60 mm – industrial use
0.70 mm+ – heavy-duty structural applications

Thicker materials:

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

Materials Used for Box Rib Roofing

Common materials include:

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

Material properties affect:

• Flexibility
• Springback
• Forming precision

These can slightly influence coil width requirements.

Industries Using Box Rib 35/1035 Panels

This profile is widely used in large-scale and industrial applications.

Common industries include:

Industrial buildings
Warehouses
Factories
Commercial roofing
Agricultural structures

It is popular because it offers:

• High structural strength
• Wide coverage
• Long-span capability
• Efficient installation

Key Factors That Affect Coil Width

Profile geometry
Rib height and width 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 smaller box profile values
This profile requires more material

Guessing coil width
Always calculate based on development

Ignoring cover width
Wider panels require more material

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

Important Engineering Note

The exact coil width for a Box Rib 35/1035 profile cannot be confirmed without a profile drawing.

Small changes in:

• Rib geometry
• Overlap design
• 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 accurate 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 – Box Rib 35/1035 Coil Width

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

Why does this profile require more material than 32/1000?
Because of increased rib height and wider coverage.

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

Can all 35/1035 panels 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 production issues, waste, 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.