Corrugated Steel Roofing Sheet — Factory Direct Supplier | Huaxia-Steel
Product Overview
Corrugated steel roofing sheet is a profiled sheet with a sinusoidal or trapezoidal wave pattern that adds stiffness without weight. It is the classic choice for industrial, agricultural and residential roofs and walls. Huaxia-Steel supplies galvanized and color-coated corrugated roofing in standard and custom profiles, factory direct with export packing and mill certificates, suitable for both new builds and renovation.
Specification Table
| Item | Range / Value |
|---|---|
| Base steel | Galvanized or Galvalume |
| Coating | Z60 – Z275 g/m2 (or AZ coating) |
| Thickness | 0.12 – 0.8 mm |
| Effective width | 600 – 1050 mm |
| Profile depth | 15 – 40 mm |
| Color | RAL standard, custom on request |
| Length | 1000 – 12000 mm (custom cut) |
Available Options
- Galvanized corrugated (unpainted)
- Pre-painted (PE, SMP, PVDF)
- Galvalume base for longer life
- Trapezoidal and sinusoidal profiles
- Anti-condensation backing (on request)
Manufacturing Standards
Base steel conforms to standards such as EN 10346 (continuously coated steel) or ASTM A653 (galvanized sheet). Color coatings follow ISO 12944 / ASTM A755 for prepainted products. Mill certificates and coating-mass test reports are provided, and third-party inspection is available. We can also supply the coil’s coating certificate so your QA team can verify mass per square metre on arrival.
Profile and Fixing Details
Standard corrugated profiles use a 76 mm pitch with depths around 18 mm, while trapezoidal profiles offer deeper ribs for longer spans. Sheets are fixed with appropriate screws and sealing washers at the crest, with side laps overlapped in the direction of prevailing weather. We supply matching flashings, ridges and screws on request so the whole roof system comes from one source and fits first time.
Applications
- Factory and warehouse roofs
- Agricultural and livestock buildings
- Residential and annex roofs
- Wall cladding and partitions
- Temporary and site structures
- Container and kiosk bodies
Quality Assurance
Sheets are checked for coating mass, profile geometry, paint adhesion and color. Coil is sourced from major mills and each lot carries a coating certificate. We can arrange SGS or BV inspection and provide salt-spray and bend-test reports on request, giving you documented proof of weather and corrosion performance before shipment.
Packaging and Shipping
Corrugated sheets are packed in bundles with edge protectors and PVC film, strapped and seaworthy wrapped for export. We ship FOB, CIF or CFR to any major port and can consolidate with other steel products in one container, with length and profile marked on each bundle for easy site identification.
Dimensional and Load Reference
| Parameter | Typical range / value |
|---|---|
| Cover width | 600 – 1050 mm |
| Profile depth | 15 – 40 mm |
| Sheet length | 1000 – 12000 mm |
| Min roof pitch | 5 degrees (sinusoidal) |
| Support span | Up to 1500 mm between purlins |
Span and pitch depend on thickness, profile depth and local wind or snow load, so confirm the structural requirement before fixing the spec. We can supply the load-span table for the chosen profile so your engineer signs off with the right thickness the first time, avoiding both under-design and over-specification that wastes material.
Common Order Mistakes to Avoid
- Ordering by ‘corrugated’ without specifying coating mass
- Mixing galvanized and color-coated in one schedule without marking
- Forgetting anti-condensation backing for cold stores
- Under-specifying length so joints fall on unsupported purlins
A clear line such as ‘Corrugated roofing, galvanized Z275, 0.5 mm x 900 mm cover x 3000 mm, 500 sheets, CIF Lagos’ prevents all four. Tell us the local climate and building use and we will recommend the coating and profile that lasts.
Why Buy Corrugated Roofing from Huaxia-Steel
We manufacture corrugated and trapezoidal roofing in galvanized, Galvalume and pre-painted finishes, with coating certificates and salt-spray reports available. Our export packing keeps bundles intact through long transit, and we supply matching flashings, ridges and fixings so the whole roof system comes from one source. Whether for a warehouse, farm or residential annex, we return a firm quote with lead time and can consolidate with other steel in one container.
Coating Systems Explained
The base coating is the heart of roof life. Hot-dip galvanized (Z) coatings range from Z60 to Z275 grams per square metre, with higher mass giving longer rust-free service; Galvalume (AZ) pairs aluminum and zinc for superior edge protection and a longer life in many atmospheres. Over the metallic coating, a pre-painted system adds a primer and a topcoat in PE, SMP or PVDF, where PVDF leads on color retention and chalk resistance in harsh sun. Choose the combination from your local climate and the building life you expect, not just from the cheapest line on the quote.
| Coating | Typical life (years, mild climate) | Best use |
|---|---|---|
| Galvanized Z120 | 10 – 15 | Sheds, rural roofs |
| Galvanized Z275 | 20 – 30 | Industrial, humid |
| Galvalume AZ150 | 25 – 35 | Coastal, long-life |
| Pre-painted PVDF | 20 – 30+ | Architectural, sun-exposed |
Color, RAL and Custom Finishes
We supply any RAL color on request, with standard whites, blues, reds and greens held in stock for fast turnaround and custom colors matched to your sample for larger projects. Color is applied over the metallic coating as a continuous paint system, so the metallic layer still protects even if a minor scratch exposes the base. For coastal or industrial sites, specify a thicker topcoat and a corrosion-resistant primer so the color lasts through the building’s design life without frequent repainting.
Fixing, Flashing and the Complete System
A roof is only as good as its fixings and transitions. We supply matching screws with sealing washers, ridge caps, gable flashings, barge boards and foam infills so the sheet, the fastener and the trim come from one source and fit first time. Fix screws at the crest of the profile, tighten to the washer just enough to seal without crushing, and lap sheets in the direction of prevailing weather. Supplying the whole system avoids the common failure where generic fixings corrode faster than the sheets they hold.
Load, Span and Pitch Guidance
Span between purlins depends on sheet thickness, profile depth and the local wind or snow load, so confirm the structural requirement before fixing the spec. A 0.5 mm sinusoidal sheet with 18 mm depth typically spans around 1000 to 1200 mm between purlins under light load, while deeper trapezoidal profiles reach further. We provide the load-span table for the chosen profile so your engineer signs off on the right thickness the first time, avoiding both under-design that leaks and over-specification that wastes material.
A Practical Ordering Example
A clear enquiry reads: Corrugated roofing, galvanized Z275, 0.5 mm x 900 mm cover width x 3000 mm length, 500 sheets, RAL 9002, CIF Lagos. From that line we confirm profile, coating mass, color and packing, and return a firm quote with lead time. Tell us the local climate and building use and we will recommend the coating and profile that lasts, and we can add anti-condensation backing for cold stores or insulated buildings.
Installation Step by Step
Start by setting the purlins to the span your profile and load require, then lay sheets from the eave upward with side laps toward the prevailing weather and end laps staggered for a weathertight joint. Fix each sheet at the crest with the supplied sealing washers, tightening just enough to seal without crushing the profile, and fit ridge, gable and eave flashings as you go. A clean, square start line is the single biggest factor in a straight roof, so spend the time to set the first sheet correctly before the rest follow.
Ventilation, Insulation and Condensation Control
Roof performance depends as much on the building envelope as on the sheet. In humid or cold climates, warm moist air meeting a cool metal surface can condense underneath, so add a breathable membrane or anti-condensation backing and provide through-ventilation above the insulation. For cold stores and insulated buildings we supply the backing and the matching insulated panel systems so the roof controls both weather and climate. Getting this right prevents drips and corrosion that no coating alone can stop.
Estimating Quantities for Your Roof
Measure the roof area, divide by the effective cover width of the chosen sheet, and add overlap and trim allowance of roughly 5 to 10 percent for waste and cuts. Remember that the effective width is less than the overall width because of the side lap, so always price and plan from the cover width, not the raw sheet width. The table below gives a quick planning reference for common profiles.
| Sheet (mm) | Cover width (mm) | Sheets per 100 m2 (approx) |
|---|---|---|
| 0.4 x 800 | 760 | 132 |
| 0.5 x 900 | 850 | 118 |
| 0.5 x 1000 | 950 | 105 |
| 0.6 x 1050 | 1000 | 100 |
Typical Building Types and Recommended Spec
For a farm or warehouse in a mild climate, galvanized Z120 to Z180 at 0.4 to 0.5 mm is usually sufficient; for an industrial or coastal building, move to Z275 or Galvalume with a pre-painted topcoat for longer life. Residential annexes and architectural roofs benefit from a chosen RAL color and a PVDF system where color retention matters. Tell us the building type and local weather and we will propose a spec that balances first cost against the service life you expect from the roof.
Request a Quote for Carbon Steel
Huaxia-Steel supplies a full range of carbon steel products with mill test certificates, third-party inspection and flexible export terms (FOB, CIF, CFR, DDP). Tell us your grade, size and quantity, and our team will return a competitive quote with lead time within 24 hours. Email [email protected] or use the contact form to start your order.
