Rockwool White Corrugated Metal Roof Panels

Shenyang Qiangyun Color Steel & Steel Structure Co., Ltd. is one of the most reliable manufacturers and suppliers of rockwool white corrugated metal roof panels in China. With abundant experience, we are committed to providing high quality customized products with competitive price. Welcome to wholesale advanced rockwool white corrugated metal roof panels in stock here from our factory. Also, pricelist is available.

• Pain Points of Conventional Roof Build-Ups

A bare single-skin corrugated sheet keeps rain out and does very little else. Its surface temperature routinely climbs 20-30 °C above ambient on a summer afternoon, so heat pours into the workspace below and the air-conditioning runs flat out all day. The same sheet drums loudly in rain, drips with condensation on humid mornings and, because it carries no insulation, contributes nothing to fire compartmentation. Cotton-felt or EPS build-ups improve insulation but introduce the opposite problem: an organic or thermoplastic core that softens, melts and gives off dense smoke in a fire, plus a felt layer that slumps and loses thickness once it gets damp.

• Our Cool-Roof Rock Wool Panel Solution

Rock wool is an inorganic basalt fibre core: it does not burn, does not melt and does not drip, and it keeps its thickness and insulating value for the life of the roof. Bonded under continuous pressure to a solar-reflective white steel face, the assembly turns the roof from a heat collector into a heat reflector. The reflective face lowers peak surface temperature substantially against a bare sheet on the same building, and the rock wool core blocks most of what little heat is still absorbed, so the space below stays cooler, the air-conditioning load drops and the underside condensation risk is greatly reduced. It is the straightforward upgrade path for plants, warehouses and factory extensions operating in hot and humid regions.

• Target Applications

GCC logistics and distribution hubs | Food, beverage and pharmaceutical plants needing condensation control | Coastal industrial estates exposed to salt spray | Steel-structure factory extensions and re-roofing over existing purlins

A high-solar-reflectance white finish lowers roof surface temperature and the cooling energy that follows from it. The corrugated profile raises bending stiffness, so wider purlin centres and fewer supports are possible. The Euroclass A1 core is non-combustible, produces no molten droplets and limited smoke. Rock wool absorbs sound rather than reflecting it, which cuts rain drumming to roughly half of a single-skin sheet. Tongue-and-groove joints combined with a hydrophobic core keep water out and hold the insulating value after wetting. Factory-cut lengths arrive ready to lay, so site time and cutting waste both fall.

Panel thickness is selected from 50 mm to 200 mm. Core-only U-values, calculated as λ / thickness with λ = 0.040 W/(m·K) and excluding joint, purlin and fastener effects, work out at approximately 0.80 W/(m²·K) at 50 mm, 0.53 at 75 mm, 0.40 at 100 mm, 0.33 at 120 mm, 0.27 at 150 mm and 0.20 at 200 mm. Add 5-10% for thermal bridging at joints and fixings when you calculate the whole roof. Note that thickness gives diminishing returns: doubling the core does not halve the U-value once bridging and air leakage are included. We normally size the core against your target U-value and purlin spacing rather than simply specifying the thickest board, and the final figures should always be confirmed against the project's own design conditions.

Substrate: hot-dip galvanised steel (Z275) or aluminium-zinc coated steel (AZ150), 0.3-0.8 mm. Coating: PVDF (70% resin content, approx. 25 µm), SMP or PE. For GCC exposure we recommend PVDF by default, because it holds gloss and colour under extreme UV and resists chalking - and chalking is not only cosmetic, since a chalked surface loses reflectance and takes the cool-roof benefit with it. Aluminium-zinc substrate is specified for coastal sites; galvanised is adequate inland. Coating mass and warranty class are stated on the mill certificate for every coil we run.

White is our standard finish for a technical reason, not a styling one: it is the highest-reflectance colour available and it is what keeps the cool-roof calculation valid. Where a corporate colour is required we can match any RAL code or print a logo on the coil, but we will tell you in writing what the reflectance penalty is, because a dark roof on the same panel can add several degrees to the interior and quietly cancel the benefit you are paying for. If reflectance and appearance both matter, choose from the high-SRI end of the RAL classic range and we will quote the measured figure.

Specified for hot, high-UV and coastal duty rather than for generic roofing: distribution warehouses and logistics parks across the Gulf, where roof area is large and cooling costs dominate the operating budget; food, beverage and pharmaceutical plants that need a clean, non-dripping soffit; seaside industrial estates exposed to salt-laden wind; and re-roofing projects where the existing purlins are reused and every kilogram of dead load counts.

Dammam, Saudi Arabia - 6,800 m² logistics warehouse, 100 mm white PVDF corrugated rock wool panels laid over the existing purlins at 1.5 m centres (2023). The client reported a clear reduction in afternoon interior temperature compared with the single-skin metal roof it replaced, and no condensation dripping on the soffit during the humid season - the two complaints that had driven the re-roofing decision. The roof was closed in 18 days by a six-man crew using standard self-tapping fasteners, and the panels shipped in two 40HQ containers from Tianjin. Shipment records and coil certificates for this order can be provided for verification.

Panels are cut to length from 1 m to 11.8 m, with thickness, core density, steel grade, substrate and coating system all selectable, plus full RAL matching or printed finishes and private-label packing and marking. We also prepare the export documentation bundle - mill test certificates, packing list, certificate of origin, declaration of performance and third-party fire test reports - so your local authority submittal does not stall on paperwork. Incoming coils and rock wool are inspected and logged against the order before a single panel is pressed; bond strength, thickness and length are checked on line; finished panels are inspected again at packing and the loading is photographed.

Fire performance is documented to EN 13501-1 (reaction to fire, Euroclass A1). Core product conformity is to EN 13162, sandwich panel performance to EN 14509, and thermal conductivity to EN 12667 / EN 12939. Solar reflectance is measured to ASTM C1549 and the solar reflectance index calculated to ASTM E1980. Production runs under an ISO 9001 quality management system. Declaration of performance, CE documentation and third-party test reports are issued per shipment, and we send the certificate copies with the quotation rather than making you ask for them - if a figure is not backed by a test report, we say so.

Founded in 2010, our 15,000 m² plant runs 26 production lines at roughly 20,000 m² of daily capacity. Quality control is document-driven rather than visual: every coil arrives with a mill certificate and is checked for coating mass and base thickness before it is uncoiled; rock wool boards are checked for density and thickness; finished panels are measured for length (tolerance ± 2 mm), thickness and squareness, and bond strength is sampled once per shift. Batch numbers stay traceable from coil to pallet, so a panel delivered to site can be traced back to the steel and the core batch it came from. More than ten years of export production means packing, marking and documentation are already built for customs clearance and for site handover.

Panels carry a workmanship warranty against delamination, and the PVDF coating carries a limited film-integrity (fade and chalk) warranty of 10 to 15 years depending on the exposure category of the site. To be explicit about the limits: the warranty covers material and manufacturing defects. It does not cover mechanical damage during handling or installation, standing water, salt or chemical deposits left unwashed, or unsealed cut edges - those are site conditions, not panel defects. We provide online technical support and remote installation guidance from the engineer who reviewed your drawings. Where a quality issue is confirmed, we replace or credit the affected panels first and settle the freight question afterwards. Pre-sales selection support, in-production progress photos and post-delivery troubleshooting are standard, not extras.

Talk to us about Rockwool White Corrugated Metal Roof Panels for your project. Send us the roof area, purlin spacing, target U-value and destination port, and we will come back with a thickness recommendation, a loaded cost per square metre and a container plan - normally within one working day. Our 15,000 m² plant (est. 2010) runs 26 production lines at roughly 20,000 m² per day, with more than ten years of export shipments behind it. Samples, third-party certificates and a complete one-stop export package are available; if reflectance or U-value figures matter to your submittal, we will put the test method and the test report behind every number we quote.

Choosing a roof core is a trade-off between fire performance, insulation and budget. EPS is the cheapest per square metre and the lightest to handle, but it is thermoplastic: it softens and melts in a fire, so it rarely survives an industrial fire review. PU and PIR deliver the lowest thermal conductivity per millimetre, which is why they dominate cold rooms, but PIR chars and PU burns - neither is non-combustible. Rock wool costs more and weighs more, yet it is the only core in this group that is Euroclass A1 and that keeps its shape and insulating value at fire temperatures. If your project is judged on fire compliance first, rock wool is the safe specification; if it is judged on insulation per millimetre in a low-risk building, PIR will usually be better value. We manufacture all four and will quote them side by side so you can decide on numbers rather than on claims.

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