For industrial or commercial projects, the correct roofing sheet is all about two things; structural stability and long term thermal performance. By combining a twin-wall hollow core with a corrugated geometric profile, the double layer hollow corrugated pc sheet stronger roofing addresses both. It is made from 100% virgin polycarbonate resin (SABIC and BAYER grades available) and provides insulation, impact resistance and natural daylighting in one panel, without the weight of glass or steel.
Single layer corrugated sheets are bent under strain and transmit heat readily. The hollow twin wall construction enhances the moment of inertia, thus the sheet resists bending under wind and snow pressure far better than solid corrugated alternatives. The corrugated profile – in 840-shape, wavy and trapezoidal – provides additional stiffness in the span direction.
Tested parameters: resistance to wind load up to 120 km/h resistance to snow load of more than 1.5 kN/m2 The sheet will also resist hail up to 20-30 mm diameter at terminal velocity without structural breakdown.
| Parameter | Details |
|---|---|
| Thickness | 2–3 mm (double-wall) |
| Structure | Twin-wall hollow + corrugated profile |
| Typical Profile | 840 shape; wavy and trapezoidal available |
| Material | 100% virgin PC resin; SABIC / BAYER grades available |
| UV Coating | Co-extruded, 50–104 microns, 1 or 2 faces |
| Light Transmittance | 75%–82% depending on color |
| Thermal Insulation (K-value) | ~3.3 W/m²K |
| Wind Load Resistance | Up to 120 km/h |
| Snow Load Resistance | Exceeding 1.5 kN/m² |
| Sound Reduction | ~20–23 dB vs. single-skin metal sheets |
| Fire Rating | UL 94 V-0 / Class B1/B2 (self-extinguishing) |
| Colors | Transparent, bronze, grey, opal, lake blue, amber, dark blue, silver, orange, yellow, or custom |
| Warranty | 10 years |
| Certification | ISO 9001:2015, CE, RoHS |
The air between the two walls is sealed , and acts as an insulator . With a K-value of roughly 3.3 W/m²K, far less heat passes through the roof than via solid curved or metal roofs.
This difference is beneficial in areas where winters are cold or the sun is strong: buildings coated with double layer hollow corrugated pc sheet stronger roofing remain cooler in the summer and warmer in the winter, reducing the long-term burden on HVAC systems. In terms of temperature-sensitive storage or busy workspaces, the twin-wall construction is obviously superior than solid corrugated solutions.
A co-extruded layer of UV resistant material is applied on one or both sides of each sheet (project dependent) and is 50 to 104 microns thick.
The UV layer is co-extruded, not added after manufacturing, so it bonds to the underlying material and won’t peel or break down after a long time outside. This prevents photo-oxidation which causes cheaper PC sheets to get yellow and become brittle and also preserves the clarity and strength of the sheets over the warranty period.
In many B2B applications, the double layer hollow corrugated PC sheet provides stronger roofing.
Industrial Buildings: The corrugated profile works well with standard metal roofing systems, which is good for large warehouses and chemical plants. The open structure lets in natural light and helps keep the inside temperature stable.
Commercial Agriculture: This sheet is used in high-tech greenhouses because the thin layer spreads out direct sunshine, which keeps leaves from getting burnt. The corrugated profile also makes sure that water drains quickly when it rains a lot.
Public Infrastructure: Canopies over train stations and walkways in stadiums need to be able to withstand wind lifting, hail, and the vibrations that come from rain. Compared to single-skin metal sheets, the air-gap structure cuts down on rain noise by about 20–23 dB, which is a big deal for areas that are occupied or that people can see.
Baoding Sinhai Sunboard Manufacturing Co., Ltd. inspects when they receive raw materials, while they're making the boards, and when they deliver them to the customer. Some important tests for this product are:
The plant produces double layer hollow corrugated pc sheet stronger roofing, and can handle orders of all sizes, from mixed container loads to big engineering project amounts. It has 3 production hubs, 25 or more production lines, and an annual output of more than 60,000 tonnes.
For corrugated profile options, there are more than 70 moulds that come in a range of pitches and shapes. Some of the services that OEM and ODM offer are CNC cutting, custom film finishing, bending, special-shaped cutting, and help with 3D modelling.
For regular sales, the process usually takes about a week. Customers in Central Asia can take advantage of faster lead times thanks to the Kashgar production base. Tashkent and Dushanbe both have local warehouses that can be used.
Q1: Why use a twin-wall corrugated sheet instead of regular solid corrugated?
A: Solid corrugated has good impact resistance, but poor heat transmission. The twin-wall variant provides an insulating air barrier – making it more ideal for facilities where people work, or where temperature-sensitive commodities are housed.
Q2: What can I do to avoid condensation and algae in the empty chambers?
A: With anti dust vented tape before adding U-profiles or flashings. This helps to enable moisture to vent while preventing dust, bugs and water from getting in.
Q3: What is the minimum slope suggested for the roof?
A: At least 5-10 degrees. This prevents rainfall from pooling in the troughs of the waves. If water pools here it might create a long term leakage at the points of the screws.
Q4: Will I harm the hollow structure by tightening screws too much?
A: Yeah. Always attach into the crest, fitting into the top of the wave. Fit EPDM-backed polycarbonate washers. This uniformly distributes pressure and prevents the hollow walls from collapsing while maintaining a watertight seal.
Q5: How to deal with thermal expansion during installation?
A: Drill pilot holes 2-3 mm bigger than the diameter of the screw shank. This enables the sheet to move slightly as it heats up under the washer, preventing it from buckling or splitting at the connecting points.
Q6: How much more noise reduction does this sheeting provide than metal roofing?
A: The air gap decreases noise by roughly 20-23 dB over single skin metal or solid plastic sheeting in heavy rain. This is a significant difference for inhabited buildings.
Do you have more questions about double layer hollow corrugated pc sheet stronger roofing? For specifications, samples, or a project quote, reach our team at [email protected].
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