Thin coated steel sheet roll-formed into a profile of waves or trapezoidal ribs, which makes it many times stiffer than flat sheet of the same thickness. Corrugated and profiled sheets are the standard roofing and wall cladding of warehouses, factories, farm buildings and site hoardings across the Middle East.
Also called
Corrugated roofing sheet
Profiled sheet
Trapezoidal sheet
Roofing sheet
GI corrugated sheet
Box profile
Wave sheet
Cladding sheet
AR
الألواح المموجة (صاج التسقيف)
ZH
压型钢板（波纹板）
DE
Wellbleche und Trapezbleche
FR
Tôles ondulées et nervurées
ES
Chapas onduladas y grecadas
IT
Lamiere ondulate e grecate
TR
Oluklu ve trapez çatı sacı
RU
Профилированный лист (гофролист и профнастил)
Main formsWave (sinusoidal) corrugated sheet, trapezoidal box profiles, standing seam and curved sheet; ridge caps and flashings
Typical sizesBase thickness 0.25–1.0 mm (0.35–0.7 mm common); cover width about 750–1,100 mm; lengths cut to order
Main standardsEN 14782, EN 508-1, EN 1993-1-3, IS 277; substrate to EN 10346, EN 10169, ASTM A653 / A792 / A755
Key gradesS280GD to S550GD with Z, AZ or painted finish · G550 AZ150 · DX51D+Z
Typical usesRoofs and walls of warehouses, factories and farm buildings, canopies, site hoardings, fencing, temporary buildings
Overview
Profiled sheet is made on roll-forming lines that bend flat coil progressively through a series of roll stands into the final profile, then cut it to the ordered length — often on site or near it, which allows single sheets as long as the roof slope. The classic sinusoidal corrugation (around 76 mm pitch, 18 mm deep) has largely given way in industrial building to trapezoidal box profiles with deeper ribs, which span further between purlins and drain better.
The substrate decides durability. Bare galvanized (GI) sheet is the cheapest; Aluzinc / Galvalume lasts considerably longer in the Gulf's hot, salty coastal air; pre-painted PPGI or PPGL adds colour and further protection. Thin full-hard high-strength grades such as S550GD / G550 are used to get stiffness from very thin steel.
A profiled roof is a structural element: its load capacity and span depend on profile depth, base thickness and steel grade, and are given in the manufacturer's load-span tables, calculated to EN 1993-1-3 or the AISI specification. In the Gulf, wind uplift, thermal expansion of long sheets in the sun, and corrosion at fixings and laps in coastal areas are the main design concerns; condensation under uninsulated roofs is a frequent problem, solved with insulation or sandwich panels.
Profiled sheet is made throughout the GCC by numerous roll-forming companies, many attached to galvanizing and coating plants, from local and imported coil.
Forms & sizes
A profiled sheet is specified by profile (shape, rib depth and cover width), substrate (grade, base metal thickness, coating) and finish. Thickness should be stated as base metal thickness (BMT); some suppliers quote total coated thickness, which can hide thinner steel.
Corrugated (wave)
Sinusoidal profile, about 76 mm pitch and 16–18 mm depth; agricultural buildings, fences, hoardings
Trapezoidal
Box ribs 20–45 mm deep (deeper profiles for long spans); the standard industrial roof and wall sheet
Standing seam
Concealed-fix roofing with seamed joints for low slopes and long sheets
Accessories
Ridge caps, flashings, gutters, closures, translucent sheets and fasteners with sealing washers
Coil Service Center · Stockist - Distributor · Contractors · Al Riyadh
