Warehouse roof panels are insulated sandwich panels that form the weathertight horizontal envelope of industrial and logistics buildings. Each panel bonds a PU or PIR foam core between a corrugated pre-painted steel outer face and a flat or lightly profiled inner liner, combining weather barrier, insulation, and ceiling finish in a single element that spans purlins without a separate roofing membrane.
The corrugated trapezoidal rib profile serves two functions: it accelerates rainwater runoff toward the eaves and increases the panel’s sectional stiffness so it can carry snow and maintenance loads across purlin spacings of 1.5 to 3.0 meters. A minimum roof pitch of 5 degrees ensures positive drainage and prevents ponding at panel laps.
Panels join through overlapping corrugated edges fastened with self-drilling screws fitted with EPDM washers, creating a mechanical seal that accommodates thermal expansion without losing weathertightness. Standard thicknesses run from 50mm to 150mm, with custom lengths up to 11,800mm to suit single-span construction and container shipping. Typical applications include steel-structure warehouses, distribution centers, factory buildings, cold storage roofs, and agricultural structures.
Your Trusted Manufacturer for Warehouse Roof Panel
RaxPanel produces warehouse roof sandwich panels in Hebei, China, where the corrugated outer skin is roll-formed from pre-painted coil and fed directly into the continuous foaming line. The trapezoidal rib geometry is verified at the roll-former exit before the panel enters the curing press, because even a 1mm deviation in rib height changes the overlap fit between adjacent panels and compromises drainage on the finished roof.
The facility has operated for since 2002 at a daily output of 1,700 m², shipping corrugated roof panels to projects in over 30 countries. Each production run is checked for bond strength between skin and core, rib profile accuracy, and fastener-hole alignment. Panels are bundled by roof zone and slope direction so that the erection crew can work from eave to ridge without sorting on the ground. Send us your roof plan, purlin spacing, and design snow load, and we will confirm panel thickness, profile, and coating grade.
- PPGI/PPGL corrugated outer skin at 0.4-0.8mm with trapezoidal rib profile.
- PU/PIR foam core at 40-45 kg/m³; thermal conductivity PU 0.022-0.024, PIR 0.021-0.024 W/(m·K).
- Standard thicknesses of 50mm, 75mm, 100mm, and 150mm with 950-1,000mm effective width.
- Overlap joint with self-drilling screws and EPDM washers; minimum roof pitch 5 degrees.
| Parámetro | Valor |
|---|---|
| Material del revestimiento | PPGI / PPGL / Aluminum / Stainless Steel |
| Espesor de Chapa | 0.4-0.8 mm |
| Material del Núcleo | PU / PIR foam |
| Densidad del núcleo | 40-45 kg/m³ |
| Thermal Conductivity | PU: 0.022-0.024 W/(m·K); PIR: 0.021-0.024 W/(m·K) |
| Rango de Espesor | 50-150 mm (standard: 50, 75, 100, 150 mm) |
| Effective Width | 950-1,000 mm |
| Longitud Máxima | Up to 11,800 mm |
| Profile Type | Corrugated trapezoidal rib |
| Sistema de Junta | Overlap with self-drilling screws + EPDM washers |
| Min Roof Pitch | ≥ 5° |
| Resistencia al Fuego | B1 / B2 per EN 13501-1 |
| Closed-Cell Content | ≥ 92% |
| Coating | PE / SMP / HDP / PVDF |
| Temperature Range | -50°C to +150°C |
Warehouse Roof Panel Engineering Guide
Warehouse roof panels must span between purlins under snow and wind loads while maintaining a continuous thermal envelope over large, unheated or semi-heated floor areas. This guide covers the span, condensation, and penetration details that determine roof longevity.
Pro Tip: Check Span Tables Before Choosing Thickness
Roof panel thickness is governed by purlin spacing and snow load, not U-value alone. A 50 mm panel may satisfy thermal requirements but fail at 2.5 m purlin centres under 1.5 kN/m² snow load. Always confirm the manufacturer’s span table for your specific load case.
Roof panel thickness is governed by purlin spacing and snow load, not U-value alone. A 50 mm panel may satisfy thermal requirements but fail at 2.5 m purlin centres under 1.5 kN/m² snow load. Always confirm the manufacturer’s span table for your specific load case.
1. Span capacity and purlin spacing
Allowable span depends on skin gauge, core thickness, and profile geometry. Trapezoidal profiles with 0.5 mm skins and 60 mm PIR core span 2.0-2.5 m under a 1.0 kPa uniform load. Increasing skin gauge to 0.6 mm or core thickness to 100 mm extends the span by 20-30%. Deflection should be limited to L/200 to prevent ponding at mid-span that accelerates coating degradation.
2. Condensation risk and ventilation
In unheated warehouses, the interior roof surface can drop below the dew point on cold nights, causing condensation drip onto stored goods. An anti-condensation fleece on the underside skin absorbs up to 1,000 g/m² of moisture and releases it when the temperature rises. For heated warehouses, a vapour control layer on the warm side and ridge-and-eave ventilation keep the roof cavity dry.
3. Roof penetrations and flashing details
Skylights, vents, and pipe penetrations are the most common leak points on insulated roofs. Factory-bonded curb frames with integral gaskets seal penetrations without field-applied sealant. Ridge caps, eave closures, and gable flashings should be ordered with the panels to ensure profile compatibility and coating colour match.
4. Roof pitch and drainage design
Insulated roof panels suit pitches from 3° for trapezoidal profiles and 1.5° for standing seam systems. Below 5°, increase side-lap fastener frequency and apply sealant in the lap to manage slower water runoff. Gutter capacity should be calculated for the 100-year storm intensity at the project location, with a minimum 50 mm overflow margin above the gutter lip.
Frequently Asked Questions
What is the typical panel weight per square metre?
A 60 mm PIR panel with 0.5 mm steel skins weighs approximately 10-12 kg/m². This allows two-person handling for panels up to 6 m and reduces the steel tonnage in the support structure.
Can roof panels be walked on for maintenance?
Panels support a 100 kg point load on the rib crown, but walking on the flat pan between ribs risks denting. Use crawl boards spanning at least three ribs for any maintenance access.
How are roof lights integrated with insulated panels?
Factory-bonded polycarbonate or GRP light panels match the insulated panel profile and fix through the same purlin holes. Specify them at the ordering stage so the panel manufacturer can cut and prepare the openings.
What is the expected roof panel service life?
Polyester-coated steel skins carry 15-20 year warranties; PVDF coatings extend to 25-30 years. The PIR core does not degrade over time when protected from UV by the steel skins.
Sandwich Panel Manufacturer
Custom Core & Skin • Tailored Dimensions