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Roofing Industry
Roofing Steel Coils & Sheets for Roofing Manufacturers
Promisteel supplies coated steel materials for roofing sheet producers, roll-forming factories, building-envelope suppliers and international steel distributors. Our roofing portfolio covers prepainted galvanized steel (PPGI), prepainted aluminum-zinc coated steel (PPGL), galvanized steel (GI), and aluminum-zinc coated steel (AZ/GL), with coating-system choices for different building environments and forming requirements.
Share your target roof profile, substrate grade, base-metal thickness, coating specification, width, color and destination market. We can review material options and quotation requirements before an order is confirmed.
Real Promisteel product and processing imagery showing coated coils, profiled sheets and factory production.
IN THIS PAGE
Roofing Materials for Different Manufacturing Needs
Coil and finished-profile supply are separate quotation scopes and must be confirmed against the RFQ.
Match the Material to the Profile and Exposure
Coil selection and finished-sheet supply are separate quotation scopes. Not every grade, width or profile is available from every production route; availability is confirmed against the RFQ.
For product-specific chemistry, grade and order parameters, review the PROMICOLOR PPGI and PPGL product page rather than treating this industry page as a full technical datasheet.
| Material | Typical use | Buyer specification focus |
|---|---|---|
| PPGI – prepainted zinc-coated steel | Color roofing and wall cladding panels | Zinc coating, paint system, TCT/BMT, color and forming performance |
| PPGL – prepainted Al-Zn coated steel | Roofing sheets and exterior panels | Metallic coating designation, cut-edge exposure, paint and project environment |
| GI – galvanized steel | Unpainted corrugated sheets and selected profiles | Zinc coating mass, steel grade, spangle/finish and sheet thickness |
| AZ / GL – aluminum-zinc coated steel | Unpainted or subsequently painted profiles | Al-Zn coating mass, forming grade and surface treatment |
| Profiled roofing sheets (subject to quotation) | Corrugated and trapezoidal roofing supply | Profile drawing, effective cover width, length, tolerance and packaging |
| Roofing accessories (subject to scope) | Ridge caps, flashings, gutters and matching trim | Color matching, gauge, profile and quantities |
promiColor Coating Options for Roofing
The roofing material portfolio includes PROMICOLOR 5 (PE), PROMIDEC 15 (HDP), and PROMIULTRA 25 (PVDF) as coating-series choices. The right system depends on required appearance, durability, forming severity, UV exposure, atmospheric corrosivity, maintenance access and the actual paint supplier's approved technical data.
Representative real coated-coil finishes. Final PE, HDP or PVDF chemistry and acceptance data must be verified for the order.
| Series | Coating positioning | Procurement note |
|---|---|---|
| PROMICOLOR 5 (PE) | Polyester-based color-coated steel | Review project life, climate and approved paint-system data |
| PROMIDEC 15 (HDP) | High-durability polyester positioning on brand overview | Verify actual paint chemistry and certificate because legacy product wording is inconsistent |
| PROMIULTRA 25 (PVDF) | PVDF-based color-coated option | Verify PVDF resin content, film build, warranty terms and project-specific evidence |
Applications Across the Roofing Supply Chain
This page addresses material supply to roof-panel producers and buyers. Structural roof design, fastening, wind uplift, fire classification and code compliance remain the responsibility of the project design and approval team.
Technical Specification Checklist for Roofing Steel Buyers
| RFQ parameter | What to state |
|---|---|
| Substrate / steel grade | GI or AZ/GL; DX51D, SGCC, SGLCC or required standard and grade |
| Thickness | Clearly identify BMT (base metal) versus TCT (total coated thickness) and tolerances |
| Width and coil | Ordered width, slit width, coil ID/OD and target coil mass |
| Metallic coating | Coating type and mass/designation, both-side basis and test method |
| Paint system | PE / HDP / PVDF, primer/topcoat/backcoat film build, approved brand if specified |
| Appearance | RAL or physical master sample, gloss, finish, color tolerance and batch matching |
| Forming / roof profile | Roll-forming profile, bend radii, panel drawing and cut length |
| Project exposure | Location, coastal/industrial exposure, humidity, temperature and maintenance |
| Order and export | Tonnage, destination port, Incoterms, packing and required documents |
Do not compare offers using nominal thickness alone. BMT versus TCT, metallic coating mass and paint-film build can materially change cost and suitability. Confirm the applicable test method and permitted tolerances in the contract.
Supply and Processing Capabilities
Profile drawing, material thickness, forming radius and finished-panel tolerances must be aligned before production.
Coil Supply and Profile Requirements
Previously published coating pages list 0.13–2.0 mm thickness, 600–1500 mm width, 25-ton MOQ, 10,000 tons/month capacity and 20–45 day delivery. These are product-page figures, not guaranteed stock, factory-wide capacity or contractual lead times. Applicability to each grade, coating and order must be confirmed.
Discuss coil slitting, cut-to-length supply, profiled-sheet sourcing, packaging and coordinated shipment where supported by the confirmed production route.
Buyers requesting ready-formed sheets can review the galvanized steel sheet for roofing listing and provide a profile drawing.
Quality Assurance: What Buyers Can Verify
Agree Acceptance Evidence Before Production
- Traceability: mill identification, coil/batch numbers and material documents.
- Dimensions: thickness basis, width, camber, flatness and coil condition.
- Metallic coating: designation and coating-mass evidence when specified.
- Organic coating: dry film thickness, color/gloss and agreed adhesion or bend tests.
- Visual condition: scratches, paint defects, edges, telescoping and transit damage.
Surface finish, metallic coating and appearance criteria should be measurable and written into the order.
Color matching should use agreed physical standards and tolerances. Warranty and corrosion-resistance claims must be tied to the actual paint supplier's written terms and site exposure.
Export Supply and Order Coordination
Moisture protection, edge guards, package labels and loading constraints should be confirmed for export.
Protect Painted Steel in Transit
Align the steel specification, production route, inspection hold points, packaging, destination port and shipping documents. Coil moisture exposure, container loading, handling damage and labeling are especially relevant to painted steel.
Typical commercial documents may include a commercial invoice, packing list, bill of lading and applicable material certificates. Destination conformity documents and import approvals depend on country and product classification.
How to Buy Roofing Steel from Promisteel
Send the RFQ
Share substrate, thickness basis, width, coating, color, volume and port.
Technical review
Confirm grade, metallic coating, paint specification, samples and profile drawings.
Quotation and approval
Agree tolerances, test documents, packing, inspection and commercial terms.
Production and inspection
Use agreed milestones, sample approval and shipment-release requirements.
Export and repeat supply
Confirm shipment documents and retain the approved specification for repeat orders.
Roofing Steel RFQ Checklist
- Company, country and application
- GI / GL / PPGI / PPGL
- Standard and grade
- BMT or TCT thickness basis
- Width, slit size and coil dimensions
- Zinc or Al-Zn coating
- Paint system and RAL or sample
- Quantity, port and Incoterm
- Profile drawing or upload
- Required inspection and documents
Frequently Asked Questions
What steel coils are commonly used to manufacture roofing sheets?
PPGI, PPGL, GI and Al-Zn coated coils are common choices. Selection depends on exposure, profile forming, appearance and project specifications.
Is PPGI or PPGL better for roofing?
Neither is universally better. Compare metallic coating, paint system, cut-edge conditions, site exposure, cost and the applicable product standard.
What is the difference between BMT and TCT?
BMT refers to base metal thickness; TCT includes applicable coatings. Define the thickness basis in the RFQ and contract to prevent misleading comparisons.
Can I choose PE, HDP or PVDF for roofing steel?
Promisteel lists these coating categories. Verify the exact paint formulation, performance data, available grades and required acceptance tests before ordering.
Can Promisteel supply custom coil widths and roofing profiles?
The website lists coated coils and a galvanized roofing-sheet product. Custom widths and profile drawings should be reviewed for order-specific feasibility.
What documents should accompany a roofing steel order?
Agree mill or material certificates, coating test evidence, inspection records and export documents according to the contract and destination requirements.
How should roofing steel be specified for coastal projects?
Provide the site exposure and expected performance requirements; select a suitable substrate, metallic coating, paint system and detailing based on documented project guidance.
What information is needed for an accurate quotation?
Provide grade, standard, BMT/TCT, width, metallic coating, paint specification, color, quantity, packaging and destination port.
This page is part of Promisteel's broader serviced-industries material support. Processing applicability can be reviewed on the
factory processing-center page.
Request a Roofing Steel Coil Quotation
Are you manufacturing corrugated sheets, supplying a roofing distribution network or procuring cladding materials? Send your drawing or material specification for a tailored commercial review.
Send roofing specifications