IBR vs Corrugated Roof Sheet: Which Machine Do You Need?
IBR vs corrugated roof sheet: profile differences, market fit, machine choice and double-layer options.
What Is IBR Roof Sheet?
IBR (Inverted Box Rib) roof sheet is a metal roofing profile with wide flat pans separated by inverted box-shaped ribs. It was developed in South Africa and is the dominant roofing profile in Southern Africa, with growing use across Africa and parts of the Middle East. IBR sheets are typically 686 mm or 762 mm wide with 76 mm rib spacing, and they are laid on purlins with a pitch of around 1.5 m.
An IBR roof sheet roll forming machine produces this profile from PPGI or galvanized coil, with or without a side-lap, at forming speeds of 10-25 m/min depending on the configuration.
What Is Corrugated Roof Sheet?
Corrugated roof sheet is the classic sinusoidal wave profile that has been used for over a century. It has round, evenly spaced waves, is available in many widths (standard effective widths around 600-1100 mm) and thicknesses (0.3-0.6 mm), and is the most universal roofing profile in the world — found in Asia, Africa, Latin America and the Middle East on sheds, warehouses, factories and farm buildings.
Corrugated machines are the most common type of roofing sheet line, with simple roller sets and low machine cost, which is why corrugated is usually the first profile a new roof sheet manufacturer installs.
IBR vs Corrugated: Key Differences
| Feature | IBR | Corrugated |
| Profile shape | Inverted box ribs with wide pans | Sinusoidal waves |
| Typical widths | 686 / 762 mm | 600-1100 mm |
| Rib / wave spacing | 76 mm | 75-125 mm |
| Main markets | Southern Africa, Africa, Middle East | Worldwide |
| Structural strength | Higher stiffness per sheet | Lower, suits lighter loads |
| Machine cost | Higher (more complex rollers) | Lower (simpler profile) |
| Fastener type | Often hidden or lapped fixing | Exposed fasteners |
The practical difference for a buyer: IBR is a regional premium profile with better stiffness, while corrugated is the universal low-cost profile with the largest demand worldwide.
Which Roof Sheet Machine to Choose
Choose based on your target market, not on machine price:
- Exporting to Africa (especially Southern Africa) — IBR is the profile your customers ask for by name. An IBR roof sheet roll forming machine matches the regional specification.
- Selling in Asia, Latin America or the Middle East — corrugated covers the widest demand, and a corrugated iron roof roll forming machine is the lower-cost, faster-payback option.
- Mixed markets — consider a machine with an exchangeable roller set, or a double-layer line that runs both profiles on one machine.
For a full comparison of roofing machine types, read our guide: How to Choose a Roof Sheet Roll Forming Machine.
Can One Machine Produce Both Profiles?
Yes, in two ways. A machine with an exchangeable roller set can switch between IBR and corrugated by changing the forming rollers (typically 2-4 hours of changeover time). A double-layer roof sheet machine carries two roller sets and can run either profile without changing tooling, at a higher machine cost but with zero changeover downtime.
If you expect roughly balanced demand for both profiles, the double-layer configuration usually pays for itself. If one profile dominates, buy the single-profile machine and keep the cost down.
FAQ
What is the difference between IBR and corrugated roof sheet?
IBR uses inverted box ribs with wide flat pans and is dominant in Southern Africa, while corrugated has sinusoidal waves and is the universal profile worldwide. IBR is stiffer per sheet; corrugated is cheaper and more common.
Which is stronger, IBR or corrugated?
IBR is structurally stronger per sheet because the inverted box ribs add stiffness, which allows wider purlin spacing. Corrugated suits lighter roof loads.
Can the same machine make both profiles?
Yes — with an exchangeable roller set (2-4 hours changeover) or a double-layer machine that runs both profiles without changing tooling.
What thickness does each profile use?
IBR typically uses 0.35-0.6 mm; corrugated typically uses 0.3-0.5 mm, both in PPGI or galvanized steel.
Which profile should I choose for my market?
For Africa (especially Southern Africa) choose IBR; for Asia, Latin America and the Middle East, corrugated covers the widest demand. Mixed markets can run a double-layer line.
How do I get a quotation?
Tell us your target profile and market by WhatsApp/Tel +86 13166567923 or email steven@zt-rfm.com, and we will recommend the right machine with configuration, price and delivery time.