Key takeaways
- Profile selection comes before machine selection — the profile determines the machine type and tooling required.
- IBR is a specific geometry, not a generic trapezoidal option — tooling must match the IBR specification.
- Standing seam is the only profiled metal roofing suitable for slopes below about 5 degrees.
- Sandwich panel production requires a completely different process from roll forming — not a roofing machine.
- Regional standards (EN 508-1, AS 1562.1, SABS 1273) govern dimensional tolerances — confirm which applies before ordering tooling.
Why profile selection matters before machine selection
Choosing a metal roofing profile is not a cosmetic decision — the profile geometry determines water performance at low slopes, wind uplift resistance, spanning capability between purlins, and the machine required to produce it. Selecting the profile first, and the machine second, avoids the common mistake of buying a machine for the wrong market or the wrong load case.
The global roofing market uses roughly six profile families. Each has a different geometry, different primary markets, and different performance characteristics. Understanding which family your buyers specify — and which standards govern them — is the starting point for machine selection.
The six main profile families
Trapezoidal profiles use flat pans separated by trapezoidal ribs. They are the most widely used profile globally — common in Europe, the Middle East, Russia, India and much of Asia. Rib pitch is typically 200–333 mm; cover widths are 750–1000 mm. The profile is simple to produce and the machine is relatively low cost.
Corrugated (sine-wave) profiles have a rounded wave form rather than a flat pan. They are used extensively in the UK, Ireland, Australia, New Zealand and parts of Africa. The wave is aesthetically softer than trapezoidal, and the profile performs well in wind and rain. Tooling is specific — a corrugated die cannot produce a trapezoidal shape.
IBR (inverted box rib) is a distinct profile with a specific rib geometry used in South Africa, the rest of Africa, the UK and Australia. Buyers in these markets specify IBR by name — it is not interchangeable with a generic trapezoidal profile even if the dimensions look similar. Tooling must match the IBR specification exactly.
Standing seam panels have tall concealed ribs and are fixed without face penetrations. Specified for high-specification commercial, industrial and architectural applications globally. Require a more complex machine and separate on-site seaming equipment.
Glazed tile / stone-coated profiles simulate the appearance of ceramic or clay roof tiles. Popular in markets where traditional tile aesthetics are expected — parts of Asia, the Middle East and Latin America. The forming process includes embossing and pressing steps beyond standard roll forming.
Sandwich panels combine an outer steel face, a foam or mineral wool core and an inner steel face in a single production line. The production process is completely different from roll forming — it involves lamination and hot or cold forming — and requires a dedicated sandwich panel line, not a standard roll forming machine.
| Profile family | Primary markets | Key characteristic | Machine note |
|---|---|---|---|
| Trapezoidal | Europe, Middle East, Asia, India | Flat pan, trapezoidal rib | Standard roofing machine |
| Corrugated (sine-wave) | UK, Ireland, Australia, Africa | Round wave form | Specific corrugating die |
| IBR (inverted box rib) | South Africa, Africa, UK, Australia | Specific rib geometry | Tooling must match IBR spec |
| Standing seam | Global, high-spec | Concealed fix, tall rib | Complex tooling, seamer required |
| Glazed / stone-coated tile | Asia, Middle East, Latin America | Tile appearance | Embossing/pressing steps |
| Sandwich panel | Industrial, cold store, food processing | Composite wall/roof element | Dedicated panel line, not roll forming |
Performance characteristics that drive profile choice
Minimum slope is a critical selection factor. Corrugated and trapezoidal profiles require a minimum slope of about 5–8 degrees to drain reliably. Standing seam can be installed at 1.5 degrees or less because there is no fastener lap that water must drain past. If the buyer's building has a low-pitch or near-flat roof, standing seam is the only profiled metal option.
Wind uplift resistance is governed by the profile depth, the rib spacing and the fixing pattern. Deeper, closer-spaced ribs with more fixings per unit area resist higher uplift. In cyclone and hurricane zones, the fixing specification often drives the profile and gauge choice regardless of other factors.
Thermal performance is affected by the profile indirectly — a deeper rib creates a larger air gap above the insulation when cold-room or acoustic insulation is fitted over the purlins. For heavily insulated roofs, a taller rib profile may be specified to create space for insulation without compressing it.
Regional standard requirements
Profile geometry is often governed by regional standards that specify dimensional tolerances, mechanical properties and sometimes aesthetics. EN 508-1 covers profiled steel sheet for roofing in Europe; AS 1562.1 governs in Australia; SABS 1273 is the South African standard for IBR.
A machine and tooling set designed to produce sections that meet EN 508-1 will not necessarily produce sections that comply with SABS 1273, even for nominally similar profiles. If you are entering a regulated market, confirm which standard applies and that the tooling is designed to meet it.
Selecting the machine based on profile and market
Once the profile family and target market are established, machine selection follows: (1) confirm whether the profile requires standard trapezoidal tooling, a corrugated die, IBR-specific tooling, or a standing seam profile; (2) establish the cover width, rib pitch and thickness range that the tooling must cover; (3) determine the production volume and required line speed; (4) decide whether multiple profiles must be produced from one machine (requiring roll cassette changes).
A common mistake is buying a 'multi-profile' machine without specifying which profiles it must switch between. A machine that can switch between two trapezoidal profiles is a simple setup change. A machine that must switch between a trapezoidal and a corrugated profile requires a dedicated cassette for each, which significantly changes the machine cost and changeover time.