Sino Steel supplies color coated roofing sheet formed from PPGI or PPGL feedstock for roofing, wall cladding and panel projects. As a color coated roofing sheet manufacturer and supplier, we match substrate route, paint system, profile geometry, effective cover width, finished length, color, factory roll forming, inspection and export packing to the actual project requirement.
The same roof profile can be formed from different prepainted metallic-coated substrates. Profile shape, paint color and sheet dimensions do not replace the substrate requirement.
Uses prepainted galvanized steel coil as the feedstock.
Uses prepainted Galvalume / Al-Zn coated coil as the feedstock.
Keep PPGI / PPGL, metallic coating and paint system on the RFQ before comparing finished roofing-sheet prices.
The final roofing sheet is defined by more than thickness and color. Rib height, pitch, overall width, effective cover width and side-lap geometry control how the sheets fit together on the roof.
Regular repeating wave geometry for roofing and cladding projects.
Confirm pitch, wave height, overall width and effective cover width.Defined rib and valley geometry used for many roofing and wall-cladding systems.
Confirm rib height, rib pitch, overlap and finished cover width.For orders where an existing panel profile, drawing or buyer sample controls the roll-forming geometry.
Send a profile drawing with all key dimensions before quotation.The formed sheet is wider than the area it actually covers after side laps are installed. Using overall width to calculate roof coverage can leave the project short of material.
The physical edge-to-edge width of one finished roofing sheet after profiling.
The installed coverage after the required side overlap or interlock is allowed for.
Confirm which rib or corrugation overlaps the next sheet and whether the profile has a defined installation direction.
Calculate sheet count and square-meter coverage from the effective cover width, not only the total sheet width.
Both belong on the project review when sheet quantity and roof coverage matter.
A profile cannot be identified reliably by a marketing name alone. Rib height, pitch, valley width and lap geometry should be confirmed from a drawing, sample or approved profile section.
Vertical profile height affects stiffness, appearance and how the panel fits the project detail.
Measure the repeating center-to-center distance between corresponding ribs or corrugations.
Check the actual formed shape where screws, overlaps, flashings or accessories rely on the profile.
For replacement or project-specific panels, send a dimensioned section drawing rather than only a product photo.
Roofing-sheet quotations can become misleading when one supplier describes the base steel and another describes the fully coated product. The thickness basis should be written clearly on the RFQ.
| Term | What It Refers To | Why It Matters |
|---|---|---|
| BMT — Base Metal Thickness | The thickness of the steel substrate before metallic and organic coatings are added. | Useful when substrate gauge and structural / forming behavior are the purchasing basis. |
| TCT — Total Coated Thickness | The overall thickness after the metallic coating and paint system are included. | Can be numerically higher than BMT, so it should not be compared as if it were the same measurement basis. |
| Finished Profile | The profiled sheet made from the coated flat feedstock. | Roll forming changes geometry, not the thickness basis used in the original material specification. |
For example, a buyer should state whether the quoted thickness is BMT or TCT when comparing suppliers.
Color should be confirmed together with PPGI / PPGL substrate, paint system, gloss and surface appearance. Website swatches help navigation but are not a production acceptance standard.
Use the RAL reference already specified by the roofing, cladding or project requirement.
Use a retained roofing sheet, approved swatch or physical sample when color continuity matters.
The same nominal color can appear different at another gloss level or texture.
Approve the physical sample or project color standard before the factory releases appearance-sensitive production.
A RAL code defines a color reference, not the entire coating system. The roofing-sheet manufacturer still needs the approved paint route, top / back coating requirements, gloss and forming conditions.
Use the paint-system route specified by the project or approved color-coated coil specification.
Confirm color, gloss, texture and visible-face paint requirements.
Back-coat color and film requirement should be stated separately where the project controls the rear face.
Service performance depends on the actual paint formulation, film build, substrate, exposure, forming and warranty basis—not only the resin name.
The factory should judge the finished roofing sheet after profiling, not only the flat PPGI or PPGL feedstock. Tight bends, ribs and valleys can reveal coating damage that was not visible on the mother coil.
Confirm the formed rib height, pitch and cover width against the approved profile drawing.
Inspect tight formed areas for cracking, flaking or visible damage where the project requires that level of review.
PPGI and PPGL use different metallic-coated substrates, so the finished profile should remain linked to the correct substrate route.
If protective film remains during roll forming, confirm that route before factory production rather than treating it as an afterthought.
The finished corrugated or trapezoidal panel is the real item that needs to fit, overlap and retain an acceptable painted surface.
The mother coil MTC and paint records do not prove every finished-profile dimension. Final factory inspection should review the actual sheet after roll forming and cutting.
Confirm overall width, effective cover width, rib pitch and profile consistency against the approved drawing.
Inspect visible painted faces, ribs and valleys for handling or forming damage that could affect the delivered appearance.
Check cut squareness, burr, local paint chipping and the newly exposed steel edge where the finished design leaves it visible.
The broad faces carry the original paint over the metallic-coated substrate. Cutting the roofing sheet to final length creates a new edge, so edge condition and transport protection should be reviewed separately.
Measure the actual cut sheet length required by the roof layout or panel schedule.
Out-of-square ends can complicate eave, ridge and overlap alignment during installation.
Inspect the new edge after cutting rather than assuming the factory-coated surface continues through the cut.
Long painted sheet stacks need packing that protects exposed ends and corners from impact and abrasion.
A thin profiled sheet can be damaged by poor lifting or by support only at the two ends. Factory stacking and shipment planning should follow the finished sheet length and profile stiffness.
Use several support points under long stacks to reduce local bending and profile deformation.
Keep the formed sheets aligned so ribs and valleys nest consistently without crushing the profile.
Different finished lengths or profile types should remain physically separated and clearly identified.
Forklift, crane and truck / container loading should avoid concentrated pressure on unsupported painted sheets.
Roofing sheet traceability should continue beyond the mother coil. The substrate route, metallic coating, paint system, color reference, roll-forming profile and finished stack identity should point to the same delivered product.
This matters when one project uses several colors, profiles, lengths or substrate routes in the same shipment.
A color coated roofing sheet supplier should pack the finished profiled stack differently from flat coil. The package must protect ribs, painted faces, cut edges and long-sheet geometry at the same time.
Use level dunnage and stack alignment that supports the sheet without flattening ribs or high points.
Steel bands should use suitable protectors and should not concentrate pressure directly on unsupported profile peaks.
Use clean separators, end / corner protection and waterproof outer wrapping where required.
Do not seal obvious rainwater or process water inside a painted roofing-sheet package before export.
For prepainted galvanized coil before roofing or cladding profiling.
View PPGI Steel Coil →For prepainted Galvalume coil used as PPGL roofing and cladding feedstock.
View PPGL Steel Coil →For metallic Al-Zn coated coil without the organic paint system.
View Galvalume Steel Coil →For galvanized, Galvalume, PPGI, PPGL and related coated-steel routes.
View Coated Steel →Send PPGI or PPGL substrate, thickness basis, profile drawing or profile dimensions, overall width, effective cover width, finished length, paint system, color, quantity and destination.
Overall width is the physical edge-to-edge width of the formed sheet. Effective cover width is the installed coverage after side overlap or interlock is allowed for.
BMT refers to the base steel thickness before metallic and organic coatings. TCT refers to the total coated thickness after those coating layers are included. State which basis you are using when comparing quotations.
Yes, suitable corrugated, trapezoidal and project-specific roll-formed profiles can be discussed from a dimensioned profile drawing, sample or confirmed geometry.
Yes. Final production color should be confirmed from a RAL code, approved physical sample or project color standard. Website swatches are visual references only.
Yes. Finished length can be matched to the confirmed order within the selected production and transport route. Long sheets require suitable stacking, lifting and packing planning.
Substrate, thickness basis, profile, cover width, finished length, paint system, color, quantity and destination are enough to start. Upload a profile drawing where the section geometry matters.
