Specifying sandwich panels for a cold storage or cold chain facility is different from standard industrial building envelopes. The panels must maintain thermal integrity at low temperatures, handle temperature cycling, resist moisture ingress, and integrate with refrigeration door systems. This guide covers the key specification decisions for cold storage sandwich panel projects.
Why PIR is the Preferred Core for Cold Storage
PIR (polyisocyanurate) has become the default core material for cold storage panels because of three properties that matter at low temperatures:
- Low thermal conductivity: ~0.023 W/(m·K), maintaining insulation performance even as temperatures drop
- Dimensional stability: PIR panels resist thermal contraction better than standard PU, reducing joint-gap risks in freezer applications
- Fire performance: B1 rating is standard, with A2 options available for facilities that also handle ambient-temperature processing areas
Choosing Panel Thickness by Temperature Zone
The required panel thickness depends on the target storage temperature and the ambient climate outside the facility:
| Temperature Zone | Target Temperature | Recommended PIR Thickness | Typical Application |
|---|---|---|---|
| Ambient storage | 10°C – 18°C | 50 mm – 75 mm | Vegetable and fruit storage |
| Cold storage | 0°C – 10°C | 75 mm – 100 mm | Dairy, meat, general cold chain |
| Chiller room | -5°C – 0°C | 100 mm – 150 mm | Fresh meat and fish processing |
| Freezer room | -18°C – -25°C | 150 mm – 200 mm | Frozen food, ice cream storage |
| Blast freezer | -30°C – -40°C | 200 mm | Quick-freeze tunnels and cells |
These are general recommendations. The actual thickness should be calculated against the required U-value, local climate data, and energy-cost assumptions for the specific project.
Joint Systems for Cold Storage Panels
The panel joint is the weakest thermal point in any cold room envelope. Three systems are common:
1. Cam-Lock Joint (Most Common)
Integrated cam-lock mechanisms inside the joint pull adjacent panels together during installation. This system provides consistent compression along the joint, reducing thermal bridging and preventing frost formation at panel connections. Cam-lock is the standard choice for most cold storage and freezer rooms.
2. Tongue-and-Groove with Sealant
Traditional tongue-and-groove joints with applied sealant. Lower cost than cam-lock but more dependent on installer skill for seal quality. Suitable for ambient-temperature storage where minor thermal bridging is acceptable.
3. Concealed Fastener with Gasket
Used for larger wall panels and ceiling installations. A continuous gasket inside the joint provides both thermal and moisture sealing. Often specified for pharmaceutical or food-grade cold rooms where joint hygiene matters.
Door Opening Details and Integration
Cold storage panels must accommodate several types of openings:
- Sliding refrigerator doors: Require reinforced door-frame panels with embedded steel frames to support the door weight and operating mechanism
- Personnel doors: Smaller hinged or sliding doors for staff access, integrated into the wall panel system
- Dock-leveler openings: Wall cutouts for loading-dock seals and levelers, requiring structural framing
- Service penetrations: Piping, electrical conduit, and refrigeration-line entries sealed with flexible boots
Ceiling Panel Considerations
Cold room ceiling panels carry additional requirements:
- Span capacity: Ceiling panels must support their own weight plus any suspended refrigeration equipment
- Defrost drainage: Panel joints should be detailed to prevent defrost-water pooling
- Access hatches: Integrated access panels for refrigeration unit maintenance
Export Packing for Cold Storage Panels
Cold storage panels require extra packing care because joint damage during transit can compromise thermal performance at the job site:
- Individual panel wrapping to prevent moisture absorption by the PIR core
- Edge protectors on all four corners of each bundle
- Wooden crate or pallet bases for forklift handling
- Tension-strapped bundles inside 40HQ containers
Get Cold Storage Panel Specification Support
LIAOHE helps buyers select cold storage panel thickness, joint type, steel facing, and door integration details based on project temperature requirements and destination climate.
Request cold storage panel specification review →
FAQ
What is the best panel thickness for a cold room?
For general cold storage at 0–10°C, 75–100 mm PIR panels are typical. For freezer rooms at -18°C or below, 150–200 mm is recommended. The exact thickness should be calculated against required U-value and energy-cost assumptions.
Why use PIR instead of PU for cold storage?
PIR has better dimensional stability at low temperatures and improved fire performance compared to standard PU. It resists thermal contraction, which helps maintain joint seal integrity in freezer applications.
What is a cam-lock joint system?
A cam-lock joint uses integrated cam mechanisms inside the panel edge to mechanically pull adjacent panels together during installation, creating consistent compression and reducing thermal bridging at panel joints.
How are cold storage panels packed for export?
Cold storage panels are individually moisture-wrapped, edge-protected, stacked on wooden bases, and tension-strapped inside 40HQ containers to prevent joint damage during sea freight.