What is Trapezoidal sheet 45/333?
The 45/333 belongs to the family of deep, wide-pitch trapezoidals (45/333, 50/250, 60/240 …) that European mills developed for roofs where purlins are far apart: three 45 mm ribs at 333 mm centres with 250 mm-wide pans, a 1 000 mm cover from a 1 250 mm coil, and — because the pans are wide — usually a small stiffening groove in each pan to stop drumming and oil-canning. Section depth is what gives a sheet its span: at 0.70 mm the 45/333 spans about 3.4 m under 0.75 kN/m² against 2.9 m for the T38, and at 1.0 mm it passes 4 m, so a designer can space purlins at 3–3.5 m on a portal frame or lay the sheet directly across trusses at 3 m without secondary purlins — a real saving on the steel frame and on erection. The wide pans also make it the trapezoidal used as a light structural deck: at 0.75–1.0 mm it carries foot traffic and light stored loads on mezzanine and plant platforms, walkways and canopies, and as a permanent shutter for thin concrete toppings where a full composite deck is not needed (for real composite floors see our composite floor deck). It is rolled from S280GD or S320GD galvanized coil — the higher yield matters at these spans — Z275 as standard, or from PPGI for coloured long-span roofs, in 0.50 (walls, close purlins) to 1.0 mm. Handling long deep sheets needs care: they are stiff along the ribs but must be lifted with spreader beams. We roll it to 14 m at Dilovası with flashings, profiled closures and the through-fix screws its 45 mm ribs need.
Grades, standards and tolerances
| Grade / standard | Yield (MPa) | Note |
|---|---|---|
| S280GD+Z275 (EN 10346) | 280 | the standard for 45/333 |
| S320GD+Z275 | 320 | longest spans, deck use |
| S350GD+Z275 | 350 | to order, 1.0 mm deck |
| DX51D+Z140 | ≈ 140 (not guaranteed) | walls only, 0.50 mm |
| PPGI on S280GD | 280 | coloured long-span roofs |
Load-span data are calculated for S280GD minimum; deck spans at 1.0 mm for S320GD.
Profile dimensions and span table
| Item | 0.50 mm | 0.60 mm | 0.70 mm | 0.80 mm | 1.0 mm |
|---|---|---|---|---|---|
| Rib height / pitch | 45 / 333 mm | same | same | same | same |
| Ribs · cover · overall | 3 · 1 000 · 1 060 mm | same | same | same | same |
| Weight per m² covered | 4.8 kg | 5.7 kg | 6.7 kg | 7.6 kg | 9.5 kg |
| Purlin spacing, 0.75 kN/m² | 2.6 m | 3.0 m | 3.4 m | 3.7 m | 4.2 m |
| Purlin spacing, 1.0 kN/m² | 2.3 m | 2.7 m | 3.0 m | 3.3 m | 3.8 m |
| Purlin spacing, 1.5 kN/m² | 1.9 m | 2.2 m | 2.5 m | 2.8 m | 3.2 m |
| Purlin spacing, 2.5 kN/m² (deck) | — | — | 1.9 m | 2.1 m | 2.5 m |
| Wall girt spacing, 0.6 kN/m² | 2.8 m | 3.2 m | 3.6 m | 4.0 m | 4.5 m |
| Min. roof slope | 5 % | 5 % | 5 % | 5 % | 5 % |
| Max. length | 14 m | 14 m | 14 m | 14 m | 14 m |
Roof values: total load on slope, two-span continuous; deck values: uniformly distributed load with L/200. Wind uplift and fixing pull-out must be checked at these spans; CE load tables per project on request.
Material, thickness and weight
| Material | Thickness (TCT) | kg/m² covered | Colours | Life (C3 / coastal) | Note |
|---|---|---|---|---|---|
| Galvanized DX51D+Z100 | 0.40–0.50 | 3.6–4.5 | spangle silver | 10–15 / 5–8 yr | cheapest; warehouses, sheds |
| Galvanized Z140–Z275 | 0.50–0.70 | 4.5–6.3 | silver | 15–25 / 8–12 yr | exposed roofs, agriculture |
| PPGI PE 25 µm on Z100 | 0.40–0.60 | 3.7–5.5 | RAL 9002, 9010, 3009, 7016, 6005 … | 10–15 / 5–8 yr | the standard coloured roof |
| PPGI SMP / HDP | 0.50–0.60 | 4.6–5.5 | as above | 15–25 / 10–15 yr | warranty projects |
| PPGI PVDF | 0.50–0.70 | 4.6–6.4 | as above | 25–30 / 15–20 yr | façades, Gulf coast |
| Aluzinc AZ150 | 0.45–0.60 | 4.0–5.4 | matt silver | 25–30 / 12–15 yr | to order, 10 t |
45/333 is normally S280GD Z275 galvanized 0.60–0.70 mm; PPGI in 9002 and 7016 for coloured long-span roofs.
Lengths and stock
Galvanized S280GD 0.60 and 0.70 mm are rolled on demand within 5–10 working days at any length to 14 m; 0.50, 0.80 and 1.0 mm, S320GD and PPGI colours are rolled to order in 2–3 weeks. Profiled closures, flashings and 5.5 × 75 mm screws for the 45 mm rib ship with the sheets.
Fixing, handling and installation
Fix through the rib crests at every purlin with 5.5 × 75–90 mm self-drilling screws (the rib is 45 mm) and 19 mm EPDM washers — every rib at every purlin on roofs above 2.5 m spans, side lap one rib stitched at 400 mm, end lap 250 mm with butyl tape (or full-length sheets). Deck use: fix every rib at every support and stitch laps at 300 mm; walk on the pans over supports until fixed. Lift long sheets with a spreader beam and suction or clamp lifters; cut with cold saw or nibbler. Profiled foam closures seal the deep ribs at eaves and ridge.
Where it is used
- Long-span roofs with purlins at 3–4 m
- Roofs laid directly on trusses without secondary purlins
- Re-roofing over widely spaced timber or steel trusses
- Light structural deck for platforms, walkways and canopies
- Wall cladding with wide girt spacing
- Outer sheet of built-up roofs with spacer systems
45/333 vs T38 vs composite deck
The T38 is cheaper per m² and enough for purlins at 2–3 m; 45/333 pays where the frame can drop purlins or the sheet must span trusses. For concrete floors on steel, the composite floor deck with its embossed ribs is the right product, not a roofing profile. The overview compares all profiles.
Price
45/333 is priced per m² by gauge and material on the roofing list, about 20–25 % above T38 for the heavier, higher-grade coil, and follows the galvanized coil price; the bands below are the month\'s indicative FOB Istanbul ranges for galvanized 0.60–0.70 mm and PPGI 0.60 mm.
Bands from our weekly export list (September 2026), FOB Istanbul, full-container quantities, excluding freight and certificates. Firm price per project on RFQ within one working day.
Export and packing
45/333 sheets are packed 20–40 per pack on timber bearers, strapped with edge boards and PE-wrapped, with paper between coloured faces; 2 000–2 400 m² of 6 m sheets fill a 40' HC (≈ 14 t at 0.70 mm), and 12–14 m sheets travel on flat-racks or breakbulk from Derince with spreader-beam lifting. Closures and long screws are boxed separately. HS 7210.41 / 7210.70 or 7308.90.
| Term | Detail |
|---|---|
| MOQ | 500 m² per gauge |
| Incoterms | FOB Istanbul · CIF / CFR Gulf, Africa · DAP EU, Balkans, Iraq, Caucasus · DAP Aktau |
| Lead time | Galvanized 0.60–0.70: 5–10 working days; PPGI and 1.0 mm 2–3 weeks |
| Packing | Packs of 20–40 sheets on timber, strapped, PE-wrapped |
| Container / truck | 40' HC ≈ 2 000–2 400 m² of 6 m sheets; 12–14 m on flat-rack |
| Documents | Invoice, packing list, EN 10204 3.1 (coil), CE DoP (EN 14782), certificate of origin; SASO / SONCAP on request |
| Payment | 30% advance, balance against B/L copy; L/C at sight above 100 t |
Certificates
The order ships with the coil mill\'s EN 10204 3.1 (S280GD / S320GD, zinc mass, paint system) and our CE declaration under EN 14782 with load-span tables for roof and deck use; a project span calculation is supplied on request.
How to order
Specify material (S280GD / S320GD galvanized zinc class, or PPGI colour and system), thickness, sheet lengths and quantities (or the roof plan and purlin spacing for a cutting schedule and span check), deck or roof use, accessories and destination.
Standards
- EN 14782 — self-supporting metal sheet for roofing and cladding
- EN 10346 — DX51D / S280GD + Z100–Z275 substrate
- EN 10169 — coil-coated (PPGI) substrate
- EN 1993-1-3 — cold-formed design; EN 10204 3.1
Grades
Grade data sheets (chemistry, mechanicals, equivalents) are on our reference site: DX51D · S280GD · S320GD
Frequently asked questions
What is trapezoidal sheet 45/333?
A deep three-rib profile — 45 mm ribs at 333 mm pitch on a 1 000 mm cover — rolled from S280GD / S320GD galvanized or PPGI coil 0.50–1.0 mm for roofs with purlins at 3–4 m and for light decking.
How far can 45/333 span?
About 3.0 m at 0.60 mm and 3.4 m at 0.70 mm under 0.75 kN/m²; 1.0 mm passes 4 m — see the span table.
Can 45/333 be used as a floor deck?
As a light deck for platforms, walkways and canopies at 0.75–1.0 mm yes; for concrete composite floors use the embossed composite floor deck.
Which grade is used?
S280GD Z275 as standard, S320GD or S350GD for the longest spans and deck gauges; DX51D only for 0.50 mm wall sheet.
What screws does the 45 mm rib need?
5.5 × 75–90 mm self-drilling screws with 19 mm EPDM washers through the crest at every purlin.