Your Trusted Stone Coated Roofing Sheet Manufacturers
Stone Coated Roofing Sheet Manufacturer
At Duolong Trade, we manufacture stone coated roofing sheets designed to serve construction material wholesalers, regional building suppliers, project contractors, and cross-border importers operating in tropical and coastal climates. Engineered to endure high UV exposure, heavy monsoon rainfall, and salt-laden humidity, our stone coated steel, aluminum, and concrete-based roofing products provide a durable, aesthetic, and scalable solution for residential, commercial, and industrial applications across Southeast Asia, the Middle East, and Africa.
Our stone coated roofing sheets are built using advanced bonding techniques that adhere natural stone granules to galvanized or aluminum-zinc steel substrates. This multi-layered system combines a protective acrylic overglaze, UV-resistant stone chips, and corrosion-resistant steel cores to deliver exceptional durability, weatherproof performance, and long-term color stability. Popular profiles include stone coated steel shingle sheets, tile-style stone coated panels, shake profiles, and slate-inspired roofing systems, all optimized for villas, warehouses, retail chain outlets, and government-funded infrastructure projects.
Manufactured in ISO 9001:2015-certified plants, every batch undergoes SGS and CE-compliant testing to meet the requirements of high-load, high-heat, and moisture-prone environments. Our roofing sheets are designed for lightweight installation, reducing substructure costs and enabling rapid project completion — ideal for high-volume procurement and phased delivery schedules. Available in a range of regionally preferred colors and finishes, each product line maintains consistent thickness, gloss levels, and pitch across production runs.
From residential housing developments and commercial buildings to industrial parks and public sector infrastructure, Duolong’s stone coated roofing sheet range supports OEM/ODM private labeling, containerized export packaging, and multilingual technical support. Our robust packaging process minimizes transit damage, and we provide installation guidance and datasheets in English, Thai, and Vietnamese to assist your engineering and sales teams locally.
When you partner with Duolong Trade, you gain a manufacturer that delivers not only high-performance stone coated roofing materials but also supply chain reliability, export compliance documentation, and factory-direct pricing. Let us help you provide long-lasting, weather-adapted roofing solutions at scale — trusted by distributors, contractors, and government buyers across Southeast Asia and beyond.
Granulated Steel Stone-Coated Shingle
Stone-Coated Steel Corrugated
Concrete-Based Stone-Coated Roof Tiles
Aluminum-Based Stone-Coated Sheets
Why Choose Us
End-to-End Manufacturing Excellence
At Duolong Trade, we manage the full production of stone coated roofing sheets in-house—from steel substrate prep and stone chip adhesion to curing and quality checks. Our ISO 9001:2015-certified facilities ensure consistent strength, color stability, and profile accuracy for both bulk and custom orders.
Built for Harsh Tropical and Coastal Climates
Our stone coated steel roofing panels are engineered for UV, rain, and salty air resistance. From housing in the Philippines to warehouses in Africa, they maintain color and durability in demanding environments.
Custom Profiles and Finishes
We offer shingle, tile, and shake profiles with options for custom lengths, colors, and thickness. OEM services include embossed logos, private-label packaging, and export-ready palletizing for distributors and contractors.
Export-Ready Logistics and Packaging
Each shipment uses reinforced pallets, shrink wrap, and moisture barriers. We support full containers and mixed loads, with clear HS codes and labeling for smooth customs clearance. Standard lead times: 10–15 working days.
Technical Guidance for Easy Installation
Every order includes installation manuals with overlap, fastener, and purlin spacing guidance. Printed and digital guides help contractors simplify rooftop work and save labor time.
Certified Quality for Global Markets
All panels are CE, SGS, and ISO certified, tested for UV resistance, water tightness, impact strength, and heat performance. We include compliance documents with every shipment to support regulated markets and public projects.
Your Ideal Choice
- Built for Harsh Weather
Duolong’s stone coated roofing sheets are engineered for extreme climates. With a corrosion-resistant steel core, stone chip finish, and UV-stable glaze, they withstand fading, peeling, and warping—even in high humidity, intense sunlight, and coastal air. From housing projects in Indonesia to industrial sites in Malaysia, they deliver proven durability with minimal maintenance. - Profiles for Every Project
Our product range fits public schools, logistics centers, housing estates, and retail spaces. Options include shingle-style sheets, tile panels, shake profiles, and slate-inspired designs, all tailored for Southeast Asian construction standards and aesthetic preferences. - OEM Solutions for Brands and Tenders
We provide private-label production with custom colors, embossed logos, and tailored packaging. Whether supplying Vietnam’s municipal projects or exclusive retail lines in Thailand, our manufacturing aligns with your technical specs and market positioning.
- Certified and Eco-Friendly Materials
Produced in ISO 9001:2015-certified facilities and tested to SGS and CE standards, our panels meet public procurement and green building codes. Made with recyclable materials and energy-efficient designs, they support sustainable construction goals. - Streamlined Shipping and Installation
Compact stacking, lightweight panels, and robust packaging simplify transport, storage, and rooftop installation. Contractors and importers benefit from reduced damage risks and faster site execution—ideal for phased and multi-site deliveries. - Reliable Supply for Large Orders
With over 100,000 m² of warehouse capacity, Duolong ensures consistent stock of key profiles and colors. We support scheduled deliveries, batch consistency, and split-container shipments to meet both long-term projects and urgent procurement needs.
FAQ Questions and Answers
We produce a complete range of stone coated roofing sheets, including shingle-style stone coated panels, tile-shaped roof sheets, shake profiles, and slate-inspired designs. Standard panel sizes range from 1,340mm x 420mm to 1,350mm x 430mm, with customized profiles available for regional installation requirements. These roofing sheets are widely used in residential housing, commercial buildings, and government infrastructure projects across Southeast Asia.
Yes. All Duolong stone coated steel roofing panels are manufactured under ISO 9001:2015-certified facilities and tested by accredited third-party labs such as SGS and CE. We provide complete compliance documentation, including Material Safety Data Sheets (MSDS), CE declarations, and market-specific certifications such as SIRIM (Malaysia), QCVN (Vietnam), and SNI (Indonesia).
Our stone coated metal roofing panels are engineered for superior performance in high-UV, heavy-rainfall, and salt-air environments. The multi-layered structure combines a galvanized or aluminum-zinc steel base, natural stone granules, and an acrylic overglaze to ensure color stability, corrosion resistance, and impact durability. These features make them ideal for coastal villas, storm-exposed warehouses, and humid industrial zones.
Yes. We provide OEM and ODM services for all stone coated roofing sheet profiles. Customization options include Pantone color matching, profile adjustments (shingle, shake, tile, slate), embossed branding, and private-label packaging. This is especially useful for public tenders, retail branding, and region-specific aesthetic requirements.
Lead times generally range from 15 to 25 working days, depending on the order size and product type. For popular profiles such as shingle-style stone coated panels, we maintain inventory for faster dispatch. All shipments are packed using PE foam, steel frame pallets, and waterproof wrapping to ensure safe transport. We support FOB, CIF, and EXW terms via Shanghai, Ningbo, and Qingdao ports.
Yes. Our stone coated steel roofing sheets are widely used in school buildings, government housing programs, and municipal warehouse projects. We provide technical CAD drawings, wind uplift test reports, fire resistance certifications, and compliance documents to support audits and tender submissions.
We handle the entire export process, supplying commercial invoices, packing lists, certificates of origin, and bills of lading. Our logistics team arranges FCL and LCL shipments, with optimized container loading to minimize damage and reduce freight costs. Special labeling and third-party inspection services are also available for multi-destination distribution.
Absolutely. Duolong’s monthly production capacity exceeds 300,000 square meters of stone coated roofing sheets, supported by a dedicated warehousing system for phased deliveries. We offer batch control to ensure color consistency and profile accuracy for large-scale projects.
Stone coated metal roofing panels combine the strength of steel with the aesthetic appeal of traditional tiles. They are lightweight, non-corrosive, and require less substructure reinforcement. Features like thermal insulation, sound dampening, and resistance to salt corrosion make them ideal for coastal and tropical environments.
Yes. We provide physical samples of our stone coated roofing sheets, including profile cut-outs and color swatches, for evaluation. Technical documents such as installation guides and third-party test reports are also available to support procurement decisions. Samples can be shipped via DHL or FedEx within 5 working days.
Shipping & Logistics
We ensure seamless delivery of your goods worldwide
- Order Confirmation
With your approval of the design and specifications, we proceed to confirm the order and prepare for mass production. This step ensures your final approval of the product. - Mass Production
The manufacturing process typically lasts about 30 days, depending on the complexity and volume of the order. We maintain strict adherence to quality standards. - Shipping
Following production, we manage the logistics of shipping your order. Shipping times vary depending on the selected method - Goods Received
Once your tiles and building materials arrive, they are ready for distribution and immediate use, fully incorporating all specified customizations and branding as agreed upon. We remain flexible to accommodate any unforeseen circumstances, ensuring a smooth process from delivery to application.
Your Trusted Stone Coated Roofing Sheet Manufacturer
Table of Contents
Bulk Pricing Advantages for Stone Coated Roofing Sheet Buyers
Stable Pricing Structure Designed for Full-Container Procurement Duolong offers a pricing system tailored to the realities of high-volume stone coated roofing sheet supply. For buyers managing multi-container shipments or regional material distribution, our bulk pricing is based on long-term procurement planning—not short-term market fluctuations. We have supported clients across Southeast Asia with predictable pricing for stone coated steel roofing panels, helping simplify tender submissions, warehouse planning, and large-scale project budgeting.
Fixed Roofing Profiles for Efficient Quotation and Repeat Orders We maintain a standardized range of core products—such as shingle-style stone coated roofing sheets, tile-shaped panels, and shake designs. By quoting based on fixed profiles and thickness grades, we help distributors and project managers secure quick price references, shorten negotiation cycles, and ensure consistency across repeat purchases. This system supports contractors and importers seeking cost stability and streamlined logistics throughout multi-phase construction projects.
Forward Contract Pricing for Public-Sector Budget Control For contractors participating in public tenders, government housing projects, or institutional roofing contracts, we offer forward contract pricing. These agreements lock in unit prices for stone coated metal roofing sheets over 3 to 6 months, enabling procurement teams to stabilize budgets and minimize risks from raw material fluctuations. This approach is ideal for projects with approved BOQs, extended bidding timelines, or phased construction schedules.
Optimized Container Loading to Lower Landed Cost per Square Meter Duolong’s pricing advantage goes beyond product manufacturing—our container loading expertise directly reduces landed costs. Each shipment is carefully packed with attention to panel dimensions, color grouping, and stacking density. This minimizes wasted space, prevents handling damage, and lowers your cost per square meter. We manage the full export process under FOB, CIF, or EXW terms, providing detailed packing lists, HS codes, CE/SGS certifications, and certificates of origin for seamless customs clearance and logistics management.
Planned Production for Seasonal or Multi-Site Delivery Our production scheduling aligns with real-world project timelines. For buyers working within seasonal construction windows or coordinating deliveries to multiple job sites, we offer advance production slot reservations and batch management. This ensures a steady flow of stone coated roofing sheets for large-scale housing projects, government school initiatives, and industrial park developments.
A Pricing Model Built for Project Execution, Not Just Purchase Our bulk pricing approach reflects the realities of field execution. Whether supplying municipal roof renovations, factory installations, or urban housing programs, Duolong delivers more than just a per-square-meter quote. We provide a scalable sourcing model supported by stable manufacturing, comprehensive export documentation, and factory-direct expertise. Every shipment is designed to keep your project on schedule, within budget, and backed by the reliability of a trusted manufacturer.
Consistent Product Specifications for Stone Coated Roofing Sheet Orders
Standardized Production Ensures Dimensional and Structural Accuracy At Duolong, every stone coated roofing sheet is manufactured through a unified production process. From mold precision to coating thickness control and cutting calibration, we maintain strict dimensional accuracy across all profiles. Whether it’s shingle-style stone coated panels, tile-shaped roofing sheets, or shake profiles, each panel complies with tight tolerances to reduce onsite misalignment, profile mismatching, and additional labor costs during installation.
Unified Mold Systems for Phased Procurement and Repeat Orders All roofing profiles are produced using fixed die sets and verified stacking modules. This allows contractors and regional importers to reorder over multiple phases without any variation in profile specifications. For multi-phase housing developments or long-term government roofing contracts, maintaining identical panel dimensions across months or quarters is critical—and this is exactly what Duolong delivers.
Controlled Color Matching for Long-Term Visual Consistency We apply inline pigment dosing and regulate stone chip adhesion thickness to ensure stable color and texture across every batch. Popular tones like terracotta red, charcoal grey, emerald green, and slate black are formulated with fade-resistant pigments, eliminating shade drift between shipments. This consistency is vital for public infrastructure projects, commercial real estate developments, and retail chain roofing where visual uniformity reinforces brand and architectural standards.
Labeling, Palletization, and Documentation Aligned to B2B Workflows Every shipment of stone coated steel roofing sheets includes full product traceability—batch numbers, profile codes, and assigned color markings. Our pallet labeling is optimized for container loading efficiency, allowing seamless identification at customs, bonded warehouses, or regional distribution hubs. For clients managing multi-SKU inventory systems or serving multiple job sites, this packaging strategy reduces unloading errors and accelerates site deployment.
Strict Raw Material Control from Input to Output We use only virgin-grade galvanized or aluminum-zinc steel substrates and premium stone granules in our coating process. Each production batch is monitored with automated thickness detectors, laser-guided profile scanners, and real-time temperature controls, ensuring every sheet is free from deformation, waviness, or color inconsistencies. This level of control gives procurement teams confidence in ordering for high-visibility government or commercial projects.
Certified Quality That Meets Institutional Standards All products are manufactured under ISO 9001:2015-certified systems and validated by third-party labs such as SGS and CE-authorized testing facilities. Our stone coated metal roofing panels meet standards for impact resistance, weather endurance, and color stability, allowing buyers to confidently submit material specifications for tenders, public housing upgrades, and compliance inspections.
Reliable Specifications Mean Predictable Results With Duolong, your stone coated roofing sheet supply is never a variable. From panel pitch and color consistency to container packing and site installation, every shipment matches the one before it. This reliability supports bulk procurement contracts, government-funded infrastructure developments, and multi-site distribution programs where material predictability matters more than customization.
Long-Term Partnership Support for Stone Coated Roofing Sheet Supply
Structured Supply Systems for Repeat Procurement and Regional Fulfillment At Duolong, we work with clients who require more than one-time shipments. Our long-term supply model is designed for buyers managing recurring deliveries of stone coated roofing sheets across multiple cities, provinces, or countries. Whether you are a building materials distributor, a project contractor, or a cross-border importer, our fixed-format production, inventory consistency, and rolling container dispatch systems help you maintain a reliable supply cycle for public, commercial, and industrial roofing projects.
Reserved Capacity and Forward Pricing for Procurement Stability To shield your procurement budget from raw material price fluctuations or seasonal construction surges, Duolong offers forward contract pricing and production slot reservation. Whether sourcing shingle-style stone coated roofing panels or tile-shaped steel roof sheets, your supply is secured at a locked rate with priority delivery during peak building seasons. This strategy supports public housing bids, large infrastructure programs, and multi-phase construction projects requiring fixed pricing and uninterrupted volume.
Dedicated Project Coordination from Forecast to Fulfillment Every long-term client is assigned a dedicated coordinator who manages demand forecasts, order windows, and logistics milestones. From container loading plans and export paperwork to delivery scheduling and port-side clearance, our team aligns every step of the process with your project timeline—ensuring your stone coated metal roofing sheets arrive on-site, on time, and without delays that could impact construction progress.
Advance Production Planning for Volume-Based Project Pipelines For clients handling annual procurement contracts, multi-country supply chains, or tender-based demand cycles, we provide advance line booking and raw material allocation. This ensures Duolong can prepare palletized loads, standardized cartons, and export documentation ahead of schedule—even during resin supply constraints or global port congestion. As a result, your shipments of stone coated roofing panels are ready when your project requires them.
Export Logistics Tailored to Multi-Region Inventory Management We help distributors and importers coordinate seamless deliveries to bonded warehouses, regional hubs, or third-party consolidators. Our logistics team optimizes tile stacking, SKU separation, and color-coded shipments to ensure accuracy across your supply chain—from customs clearance to warehouse labeling. Whether your customers are in Vietnam, Malaysia, Indonesia, or the Middle East, we streamline the import process and support cross-border inventory management.
Early Material Access and Technical Support for New Projects Long-term partners benefit from early access to upgraded product lines—including UV-resistant stone coated tiles, reinforced steel profiles, and heat-reflective roof panels. We provide sample kits, performance data, and technical specifications to assist with government tenders, architectural catalogs, and client design approvals. This competitive edge allows you to stay ahead in public-sector bidding and high-value procurement.
A Manufacturing Partner Focused on End-to-End Supply Resilience Working with Duolong means securing more than just a product—it means securing a reliable supply framework built for repeatability, regional scalability, and procurement certainty. With consistent dimensions, standardized color matching, SGS/CE-certified stone coated roofing sheets, and containerized export processes, we help B2B buyers minimize supply risks, control costs, and deliver outstanding results in every roofing contract.
How Stone Coated Roofing Sheets Help Reduce Construction Costs
Lightweight Panels Reduce Structural Load and Framing Requirements Duolong’s stone coated roofing sheets weigh significantly less than traditional clay tiles or concrete roof panels. This lighter material reduces structural demand on trusses, steel beams, and sub-purlins, allowing engineers and contractors to design more economical support systems. In residential housing, warehouse projects, and government modular facilities, the reduced weight lowers steel consumption, shortens structural assembly time, and minimizes foundation load—helping cut construction costs at the core level.
Weather-Resistant Performance Minimizes Maintenance Expenses Our stone coated steel roofing panels feature a corrosion-resistant metal core coated with UV-stable stone granules and an acrylic glaze, delivering excellent protection against solar degradation, salt air corrosion, and acid rain. Unlike bare metal that rusts or clay that cracks in tropical heat cycles, Duolong’s roofing sheets require no repainting, anti-rust treatment, or early-stage replacement. This is especially advantageous for schools, municipal warehouses, and industrial parks where maintenance access is limited and cost predictability is critical.
Quick-Install Profiles Increase Speed and Reduce Labor Costs Every stone coated roofing sheet we produce features standardized panel sizes, fixed overlap spacing, and clean-cut edges for precise alignment. Installers can cover large roof areas faster without excessive trimming or adjustments. This efficiency is vital for housing developers, government contractors, and industrial construction teams working under tight seasonal deadlines, reducing scaffolding time, workforce hours, and overall site overhead.
Enhanced Durability in Transport Reduces Product Loss Traditional clay or ceramic tiles often crack or deform during long-haul shipping. Duolong’s stone coated metal roofing sheets, on the other hand, retain flexibility and impact resistance throughout transport and container unloading. Foam interlayers, reinforced palletization, and shrink-wrapped bundles protect each shipment from transit shocks and compression, minimizing on-site product loss and costly reorder cycles.
Thermal and Acoustic Benefits Deliver Indirect Energy Savings With their inherent insulation properties, stone coated roofing sheets reduce rooftop heat absorption and help block external noise—creating cooler, quieter interiors. In community centers, workshops, and classrooms, this reduces reliance on air conditioning systems or acoustic retrofitting, leading to lower energy bills and improved occupant comfort. These benefits compound over the building’s lifecycle, particularly in Southeast Asia’s hot and humid climate zones.
Cost Efficiency That Extends Across the Full Supply Chain Choosing Duolong’s stone coated steel roofing system is more than selecting a material—it’s a strategic investment in cost control. From structural load savings and faster installation to export-ready packaging and long-term durability, our roofing panels deliver measurable value at every stage of the project. That’s why importers, contractors, and institutional developers across the region trust Duolong to help protect not only their buildings—but also their budgets.
Ensuring Smooth Customs Clearance and Compliance in Global Trade
Export-Ready Shipments for Construction Material Buyers At Duolong, we understand that supplying stone coated roofing sheets to international markets requires more than just manufacturing. Our export operations are designed to meet the needs of government contractors, infrastructure developers, and regional importers who rely on smooth customs clearance and accurate documentation. Whether your project involves phased container shipments or direct-to-site deliveries, we ensure every load meets the compliance standards of your destination country.
Country-Specific Export Files Prepared with Precision Each shipment of stone coated steel roofing sheets, whether shingle-style or tile-shaped panels, includes a complete set of export documentation tailored to local import regulations. Our export team prepares commercial invoices, HS code declarations, certificates of origin, packing lists, and factory audit records—all formatted to meet clearance requirements for ports in Manila, Jakarta, Lagos, or Jeddah. For public-sector contractors and bonded warehouse importers, this documentation minimizes delays and aligns with regional compliance frameworks.
Third-Party Certification Backing Every Shipment All Duolong stone coated metal roofing sheets are supported by SGS laboratory test reports, CE certificates, and in-house quality control data verifying resistance to UV exposure, corrosion, and mechanical stress. These certifications simplify customs inspections, infrastructure funding audits, and material registration for public tenders. Our compliance archive allows procurement teams to provide verifiable proof during logistics or government approval stages.
Pre-Export Inspection and Verified Packing for Customs Accuracy Before each container is sealed, Duolong performs a pre-shipment inspection to match product content with declared export documents. Panels are color-coded, model-labeled, and shrink-wrapped, with weight and volume cross-checked against the packing list. Pallets are barcode-tagged and mapped to container configurations, ensuring smooth destination port inspection and reducing the risk of detainment, repacking, or fines.
Supporting Government Project Procurement with Full Declarations For shipments tied to public housing programs, school roofing initiatives, or disaster shelter tenders, we provide additional documentation such as environmental compliance statements, material safety data sheets, and detailed composition certificates. Available in English, Vietnamese, Arabic, or other requested languages, these files help buyers pass approval reviews, regulatory screenings, and grant-backed procurement checkpoints efficiently.
Trusted Freight Coordination and Port Handling Expertise Duolong partners with licensed freight forwarders and customs brokers experienced in handling construction-grade roofing materials. We coordinate FCL and LCL shipments under FOB, CIF, or EXW terms through major Chinese ports like Qingdao, Ningbo, and Shanghai. From container slot booking to unloading assistance, our logistics team aligns shipping timelines with your warehouse intake and jobsite deployment schedules.
Real-Time Tracking and Transparent Document Flow From factory sealing to final customs clearance, Duolong provides real-time tracking updates and transparent document sharing. Clients receive status notifications for shipment departure, customs milestones, and delivery schedules, along with organized digital document handovers. This clarity helps importers and logistics teams synchronize site readiness and reduce downtime.
A Fully Prepared Export Solution—Beyond Just Roofing Sheets Each shipment of stone coated roofing sheets from Duolong is part of a comprehensive export-ready package. Backed by certifications, precise documentation, and proven freight coordination, we help our partners avoid unexpected delays, clear customs smoothly, and deliver roofing materials with confidence across Southeast Asia, the Middle East, and Africa.
Flexible Order Quantities to Support Every Stage of Your Business
Low MOQ Support for Importers, Contractors, and Pilot Buyers At Duolong, we understand that not every roofing project begins at full-container scale. Whether you’re introducing stone coated roofing sheets into a new market, preparing material samples for a public-sector tender, or purchasing for a phased construction rollout, we offer low minimum order quantities across all standard profiles. This flexibility helps importers, project contractors, and regional distributors manage warehouse space, funding cycles, and market testing with confidence.
Mixed Model Shipments for Efficient Market Response Clients can combine multiple product profiles—such as shingle-style stone coated panels, tile-shaped steel roofing sheets, and shake-style designs—into a single LCL or trial shipment. This option reduces overstock risk for distributors, enables contractors to meet diverse specification sheets, and allows buyers to evaluate demand across product lines. All panels are palletized with reinforced stacking, optimized load planning, and full customs compliance for smooth delivery.
Strict Quality Control Regardless of Order Size Every stone coated metal roofing sheet is produced under the same ISO 9001:2015-certified processes, whether for a small batch or a full 40HQ container. We apply dimensional tolerance checks, coating adhesion tests, and UV-resistance validation to all orders. Each unit is wrapped, barcoded, and labeled in line with CE and SGS certifications, ensuring consistent quality and export readiness—no matter the quantity.
Scalable Supply Without Changing Vendors As your projects grow, Duolong’s production systems scale with you. From early-stage trials of stone coated roofing sheets to high-volume rollouts for large infrastructure contracts, we maintain batch consistency, color uniformity, and tooling precision. This reliability allows you to increase procurement without risking material mismatches or supply disruptions common with vendor changes mid-cycle.
Ideal for Market Testing, Tender Submission, and Phased Construction Our flexible MOQ model supports clients preparing validation sets for new markets, architectural kits for tender bids, or materials for initial construction phases. Buyers can assess structural fit, installation efficiency, and packaging durability before committing to large-scale inventory—reducing financial exposure and aligning with dynamic project timelines.
Export Services for Small and Phased Shipments Even for partial container or LCL shipments, Duolong provides full export services: including commercial invoices, certificates of origin, HS code filing, and CE/SGS documentation. Our logistics team works with freight partners to manage port declarations, mixed-load container planning, and schedule coordination, ensuring smaller orders are delivered with the same precision as bulk shipments.
A Supply System Designed to Grow With You From your first trial batch of stone coated roofing sheets to full-scale procurement for regional housing projects, Duolong offers a scalable and standards-compliant supply chain. This approach allows you to respond quickly to bids, market opportunities, and project awards—without compromising on product quality, delivery accuracy, or customer confidence.
Dedicated After-Sales Support for Reliable Project Execution
Installation Support That Extends Beyond Delivery At Duolong, delivery is not the end of our job—it’s where our real support begins. Every shipment of stone coated roofing sheets comes with structured technical assistance to ensure proper installation and long-term performance. Whether the panels are used in school construction, warehouse roofing, or public housing projects, we provide profile-based installation guides, direct service communication, and region-specific technical recommendations to help your team install with confidence and precision.
Adapted Guidance for Structural Framing and Climate Zones We understand that roof pitch, substructure materials, and local climate zones directly affect roofing performance. That’s why we offer tailored installation advice for each project’s framework and site conditions. From batten spacing and fastener positioning to overlap configurations and thermal expansion allowances, our team helps optimize the mounting of stone coated steel roofing sheets for coastal, high-humidity, or high-heat inland environments—ensuring durability across all applications.
Profile-Specific Documentation for On-Site Clarity Each shipment includes technical documentation linked to its specific panel type—whether shingle-style stone coated panels, tile-shaped steel sheets, or shake profiles. These documents provide clear diagrams for screw placement, edge overlaps, fastening torque, and expansion joint setups in both print and PDF formats. Such tools reduce errors during installation and are especially valuable for complex multi-slope roofs, prefabricated steel buildings, and modular construction systems.
Real Project Feedback Translated into Field Solutions When unexpected issues arise—such as panel vibration, alignment challenges, or substrate adjustments—our technical team provides practical support based on real-world case experience. Drawing insights from completed projects across Southeast Asia, Africa, and the Middle East, we help troubleshoot installation inconsistencies and prevent material damage, keeping your project on schedule and ensuring roof longevity.
Technical Continuity for Multi-Phase and Repeat Projects For clients managing multi-stage developments across schools, industrial parks, or public facilities, we maintain site-specific installation notes, color logs, and fastening recommendations to ensure consistency in roof alignment and appearance across phases. This continuity reduces the need for retraining contractors and prevents costly adjustments between project stages.
Training Materials for New Markets and First-Time Contractors For new buyers or market launches of stone coated metal roofing sheets, Duolong provides comprehensive training resources. These include step-by-step installation videos, user manuals, and remote consultation to help contractors quickly adapt to material handling and fixing requirements. In select regions, we also coordinate on-site orientation sessions with local partners during initial deliveries—building installer confidence and minimizing startup risks.
Every Delivery Backed by Practical On-Site Execution Support Whether it’s a sample shipment of stone coated roofing sheets or a full-container load for a large-scale project, Duolong backs every order with responsive technical service. Our after-sales support ensures your team installs correctly the first time—helping you reduce delays, optimize material usage, and deliver long-lasting roofing solutions for government, commercial, and infrastructure clients.
Certification and Documentation Support for Government and Institutional Roofing Projects
Proven Experience Serving Government Construction Across Regions At Duolong, we have years of experience supporting government-led and donor-funded construction projects across Southeast Asia, the Middle East, and Africa. Our stone coated roofing sheets have been supplied for public housing developments, rural school upgrades, healthcare center roofing, and municipal infrastructure roofs. From school rehabilitation programs in Indonesia to community housing in Nigeria and public shelters in the UAE, our export and compliance teams are fully equipped to handle technical files and procurement documentation required for institutional projects.
ISO-Certified Manufacturing with Verified Performance Testing All Duolong stone coated steel roofing panels are produced under ISO 9001:2015-certified systems, with continuous validation for UV resistance, tensile strength, weather aging, and long-term color stability. Third-party certifications from SGS and CE conformity documents give institutional buyers confidence during audits, donor evaluations, and construction material reviews—ensuring our panels meet the strict performance standards of public-sector contracts.
Complete Compliance Documentation for Tender Submission Every shipment includes a full set of export and compliance paperwork: commercial invoices, certificates of origin, HS code declarations, packing lists, and SGS test reports. For public tenders and institutional procurement, we also prepare Declarations of Conformity, technical data sheets referencing ISO/EN standards, and color stability traceability records. These documents are aligned with standard government submission formats to reduce resubmission risk and speed up tender approvals.
Technical Alignment with Project Specification Manuals We verify our stone coated metal roofing sheets against engineering specification manuals to ensure compliance with required roof pitch, overlap dimensions, panel thickness, and fastening systems. This helps contractors and bidders pass material acceptance inspections, avoid rejection during design approvals, and eliminate last-minute on-site material substitutions caused by spec mismatches.
Bilingual File Support and Region-Specific Certifications Our documentation team offers bilingual support in English–Vietnamese, English–Thai, and English–Arabic to meet the needs of regional public authorities and avoid translation discrepancies. We assist clients with CE/SGS formatting, factory inspection scheduling, and compliance audit preparation—ensuring each roofing shipment meets customs, project supervision, and institutional requirements without delays.
Approved Roofing Products in Completed Public Projects Duolong’s stone coated roofing panels have been used in village resettlement housing, provincial education centers, and community halls—where certification-backed quality and material consistency were essential. Our track record includes collaboration with public works departments, municipal contractors, and internationally funded agencies, all requiring complete, verifiable documentation at every project milestone.
More Than a Manufacturer—A Document-Ready Institutional Partner When you work with Duolong, you gain more than a roofing supplier—you secure a documentation-ready partner who provides certification, traceability, and tender-aligned paperwork. This partnership reduces risk, speeds up project approvals, and ensures your public or institutional roofing project proceeds smoothly from bid submission to rooftop installation.
Proven Durability in Humid and High-Temperature Environments
Engineered for Harsh Tropical, Coastal, and High-UV Regions Duolong’s ASA high weather-resistant composite corrugated roof tiles are designed for climate zones where ordinary roofing materials fail. From Southeast Asian equatorial cities to coastal warehouses in West Africa and sun-exposed logistics centers in the Middle East, our panels are built to resist warping, fading, and surface degradation caused by constant heat, moisture, and ultraviolet exposure. Whether used in public housing, government schools, or factory-scale facilities, the performance holds under real-world weather cycles.
Co-Extruded ASA+PVC Construction for Long-Term Dimensional Stability Each Duolong roofing tile features a dual-layer structure, combining an ASA outer surface that resists UV damage and chemical corrosion with a rigid PVC base engineered to prevent deformation and moisture penetration. This design provides long-term shape retention and color integrity, even after years of exposure to tropical rainfall, thermal expansion, and saline air. The layered co-extrusion structure also supports load-bearing roof spans without loss of strength or fit over time.
Certified Performance Under Climate-Specific Stress Testing Duolong’s ASA resin corrugated roof tiles and trapezoidal ASA-PVC panels are certified by SGS and third-party labs for UV resistance, low water absorption (<0.1%), and mechanical durability after accelerated weathering cycles. These lab results reflect the tile’s ability to maintain impact resistance, sealing performance, and surface finish even in high-humidity agricultural builds, open-sided industrial sheds, and public-sector rural projects.
Lightweight Format Reduces Frame Stress and Mold Risk In humid and rain-heavy climates, roofing must drain effectively and avoid stress buildup. Duolong tiles are lightweight and do not retain moisture, reducing the risk of frame overloading, panel swelling, or mold-related delamination. Their low mass reduces truss strain, especially on prefabricated steel structures or timber-framed rural buildings, contributing to longer service life and reduced maintenance incidents across seasons.
Installation Guidelines Tailored to Environmental Variables We provide technical support aligned with climate-specific conditions. Each delivery includes thermal expansion coefficients, fastening layout maps, tile spacing guides, and slope configuration references tailored for heat-intense, salt-rich, or moisture-heavy environments. These references help contractors avoid installation errors, especially in donor-funded school projects, modular housing schemes, and regionally specified infrastructure programs.
Built for Regions Where Climate Challenges Are Non-Negotiable With Duolong, you receive more than a roofing product—you receive a material designed for the climate realities of tropical, coastal, and arid inland zones. From monsoon-exposed community centers to solar-saturated rooftops in public facilities, our ASA composite corrugated roof tiles are proven to endure where roofing failure is not an option.
