Sandwich Panel vs. Cold Room Panel: 4 Core Differences You Should Know

Sandwich Panel vs. Cold Room Panel: 4 Core Differences You Should Know

What are the differences between sandwich panels and cold room panels, the two most confused products in industrial insulation? Here are 4 core differences you need to know, from insulation core to locking systems.

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Sandwich Panel vs. Cold Room Panel: 4 Core Differences You Should Know

When you step into the world of construction and insulation, the two terms you will encounter most frequently are probably sandwich panel and cold room panel. At first glance, they might look exactly the same: an insulation core sandwiched between two metal sheets.

However, that is not entirely the case. Let's state the golden rule of the industry right at the beginning: Every cold room panel is a sandwich panel, but not every sandwich panel is a cold room panel.

So, which one should you choose for your project? Understanding the differences will help you spend your budget and energy on the right solution. Here are the 4 core differences between them:

1. Insulation Core and Density

Standard sandwich panels are used for general-purpose roof and wall claddings. Therefore, materials like rockwool, EPS (Expanded Polystyrene), or standard polyurethane can be used as the inner core. Their density varies according to the intended use.

Cold room panels, on the other hand, are fully programmed to "zero out thermal leakage." These panels generally use high-density (40-42 kg/m³) polyurethane (PUR) or polyisocyanurate (PIR) foam. The goal is to preserve the cold air inside and strictly prevent external heat from infiltrating.

2. Thickness Levels

For the wall of an ordinary industrial facility, a sandwich panel with a thickness of 40 mm or 50 mm is usually sufficient. After all, the main purpose is just to protect the building from external elements and maintain a standard room temperature.

However, when it comes to a cold storage room or a blast freezer, things change completely. The thickness of cold room panels starts from 60 mm and can go up to 200 mm depending on the requirements. If you are building a frozen storage area that operates at temperatures like -20°C, it is impossible to maintain this temperature with a standard wall panel.

3. Joints and Locking System (Cam-lock)

This is the most critical engineering difference that sets the two panels apart.

• Standard Sandwich Panel: Panels are connected to each other with an overlapping (interlocking) method and fixed with screws from the outside. Micro air leaks do not lead to structural failure.

• Cold Room Panel: These panels feature a special mechanism called an "eccentric lock" (cam-lock). During installation, the panels are pulled tightly together with these locks to achieve a seamless, zero-gap joint. This completely seals the joints to prevent thermal bridging and any moisture/air infiltration.

4. Hygiene and Surface Structure

The outer surface of standard sandwich panels is usually made of polyester-painted galvanized steel sheet. This is perfectly suitable for warehouses, factories, and hangars.

Cold room panels, however, mostly appear in the food, pharmaceutical, or chemical sectors. Therefore, their surfaces must be anti-bacterial, easy to clean, and compliant with food regulations (PVC coated or CrNi/Stainless Steel). Stainless steel (inox) surfaces are indispensable for humid cold rooms.

Summary Comparison Table

In summary; if your goal is to build a production facility, a standard warehouse, or a prefabricated building, budget-friendly sandwich panels will more than do the job. However, if you are designing an area where you will store food, pharmaceuticals, or where temperatures drop below zero, you must definitely choose cold room panels.