Customized color coated corrugated roofing sheets should be specified as a complete system, not as a colour-only product. The buyer needs to confirm the substrate and steel grade first. Then confirm base-metal thickness, overall width, effective cover width, corrugation profile and cut length. The paint system needs its own line for colour, surface finish, quantity, packing and destination. PPGI and PPGL are both possible routes. The final substrate and coating combination must be confirmed against the building environment, forming process and project specification. A clear schedule helps the supplier price the same product the buyer intends to install. It also prevents a finished-panel quotation from being confused with a parent-coil quotation. State every open field as confirm per order before production. Bomis Steel can review the full brief and return the available combination for the project. This approach keeps geometry, steel and coating decisions visible in one quotation. The buyer can then compare offers without guessing which field each supplier has assumed.<\/p>\n
![\"Customized](\"https:\/\/www.bomissteel.com\/wp-content\/uploads\/2026\/10\/img-mvaixulf-29236a13.webp\")
<\/h2>\nThe phrase \u201ccustomized color coated metal roofing sheet\u201d describes an application, not a complete manufacturing order. Two sheets can have the same colour and profile but different substrates, thicknesses, coating systems and forming tolerances. Those differences affect the quotation, production route and installation plan.<\/p>\n
Start with the building use. A warehouse roof, agricultural building, workshop wall and replacement roof may need different profiles, cut lengths, fixing details and coating requirements. Then define the sheet geometry. The supplier needs to know the overall width, effective cover width, corrugation pitch, crest or valley shape, panel length and overlap arrangement. A drawing is more useful than a product name when the profile is project-specific.<\/p>\n
The coating specification also needs a clear boundary. A colour card does not define the substrate, primer, top coat, reverse coat or film requirement. State the colour reference and the expected paint system, then ask the factory to confirm the available combination per order.<\/p>\n
PPGI uses a galvanized steel substrate under the paint system. It can be considered when the project specification calls for galvanized substrate or when the buyer\u2019s standard is based on a galvanized coil route. The buyer should state the required grade, coating class, paint system and forming method rather than treating \u201cPPGI\u201d as a complete specification.<\/p>\n
PPGL uses a Galvalume or aluminum-zinc coated steel substrate. Buyers may consider it when the project brief calls for an aluminum-zinc substrate or when the specified application requires a different substrate system. The final choice still depends on the governing standard, coating class, forming route and environment.<\/p>\n
Bomis Steel can review either substrate direction when the buyer provides the project brief. Do not substitute one for the other in the quotation. Record the substrate as a separate line from the paint system so the supplier and buyer are comparing the same material.<\/p>\n
A useful quotation schedule separates the steel, coating and finished-panel information.<\/p>\n
| Group<\/th>\n | Information to confirm<\/th>\n<\/tr>\n<\/thead>\n |
|---|---|
| Steel<\/td>\n | Substrate, grade, standard and base-metal thickness<\/td>\n<\/tr>\n |
| Sheet size<\/td>\n | Overall width, effective cover width and cut length<\/td>\n<\/tr>\n |
| Profile<\/td>\n | Wave or trapezoidal shape, pitch, height and overlap<\/td>\n<\/tr>\n |
| Paint<\/td>\n | Colour reference, paint system, primer, top coat and reverse coat<\/td>\n<\/tr>\n |
| Surface<\/td>\n | Smooth, matt, wrinkle, embossed or another requested finish<\/td>\n<\/tr>\n |
| Quantity<\/td>\n | Number of panels, total area or weight and loading plan<\/td>\n<\/tr>\n |
| Paketlash<\/td>\n | Film, stacking, strapping, edge protection and marks<\/td>\n<\/tr>\n |
| Delivery<\/td>\n | Destination port, delivery term and handling requirements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n The word \u201ccustomized\u201d should never replace these fields. If a parameter is not confirmed, label it as \u201cconfirm per order\u201d rather than inserting an assumed value. This protects the buyer from comparing a finished-panel quotation with a parent-coil quotation that uses different assumptions.<\/p>\n How Profile and Cut Length Affect Production<\/h2>\nCorrugated roofing sheets are formed from coated steel through a roll-forming route. The profile affects the effective cover width, sheet stiffness, overlap arrangement and installation layout. A small change in profile can change the amount of material needed for the same roof area.<\/p>\n Cut length matters as well. Buyers should send the panel schedule, tolerance, quantity per length and any special end treatment. Long panels may reduce lap joints but can change loading, handling and installation requirements. Shorter panels may fit the site plan but create more overlaps. The quotation should show how the requested lengths will be packed and loaded.<\/p>\n If the order includes wall cladding, state that application separately. A roof profile and a wall profile may not have the same design or fixing detail. The supplier should review the intended use before confirming a profile.<\/p>\n How to Specify the Paint System<\/h2>\nThe paint system should be selected with the project environment and forming route in mind. PE, SMP, HDP and PVDF may be considered for different order requirements, but Bomis Steel does not treat one coating system as automatically suitable for every project.<\/p>\n Provide the colour reference, gloss or surface preference, top-coat request, primer request, reverse-coat requirement and protective-film requirement. Ask the supplier to confirm the available coating combination, minimum order conditions and production schedule per order. If the buyer needs a colour sample, request an approval sample before mass production.<\/p>\n Surface appearance and performance are related but not identical. A smooth surface, matt surface, wrinkle finish or embossed pattern changes the appearance and may affect the forming discussion. Keep the appearance request separate from the technical coating schedule.<\/p>\n What Should Be Confirmed Before Export Packing?<\/h2>\nPacking is part of the purchasing specification for corrugated panels. State whether the sheets will be loaded flat, bundled by length, protected with film, strapped with steel or another approved method, and marked for site handling. Edge protection and moisture protection should be included when the route or handling plan requires them.<\/p>\n The destination port and delivery term also matter. The supplier needs to review bundle dimensions, loading direction, container utilization and lifting access. A buyer who sends the roof schedule together with the packing brief gives the supplier a better basis for an accurate quotation.<\/p>\n Bomis Steel can review the sheet profile, packing plan and export requirements together. The final method is confirmed per order after the dimensions, quantity and destination are known.<\/p>\n How to Request a Comparable Factory Quotation<\/h2>\nSend one structured enquiry rather than several separate messages. Include the application, substrate, grade, standard, thickness, width, length, profile, colour, coating system, quantity, packing and destination. Attach a drawing or reference sample when the profile is customized.<\/p>\n Ask each supplier to return the same fields. That makes it easier to compare whether a quotation covers the same substrate, coating, finished dimensions and delivery basis. If the supplier proposes an alternative, request the change in a separate line instead of accepting an undefined substitution.<\/p>\n A practical enquiry can use this order:<\/p>\n
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![\"Prepainted](\"https:\/\/www.bomissteel.com\/wp-content\/uploads\/2026\/10\/img-mvaixv9i-1d72ba25.webp\")
![\"Export-packed](\"https:\/\/www.bomissteel.com\/wp-content\/uploads\/2026\/10\/img-mvaiy2j9-e0549fc6.webp\")
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