Cold room insulation panels: materials and thickness
The insulated envelope decides how much heat the refrigeration plant must remove for the life of the building. Panel core, thickness, joints and floor build-up all matter as much as the refrigeration equipment.
Most cold rooms use insulated sandwich panels with a PIR or PUR core (thermal conductivity around 0.022–0.024 W/m·K per manufacturer declarations). Typical planning thicknesses are about 80–120 mm for chilled rooms and 150–200 mm for freezers at −18 to −25 °C. Mineral wool panels are used where a non-combustible core is required but need greater thickness. Freezer floors need insulation, a vapour barrier and underfloor heating or ventilation.
1. Panel core options
The core sets insulation value, fire behaviour and weight.
- PIR: good insulation and generally better fire performance than PUR.
- PUR: similar insulation value, widely used in cold rooms.
- Mineral wool: non-combustible core options, higher conductivity (about 0.035–0.040 W/m·K), so thicker panels are needed.
2. Choosing thickness
Thickness follows the temperature difference between the room and the design outside temperature, and the heat flow you accept.
- Thickness ≈ conductivity × temperature difference ÷ accepted heat flow (often about 8 W/m²).
- Round up to the nearest standard panel size.
- Our panel-thickness calculator gives a first estimate by temperature.
3. Floors, joints and vapour control
Most performance problems come from joints, penetrations and floors rather than the panel itself.
- Sealed, tight panel joints and a continuous vapour barrier on the warm side.
- Insulated floor with underfloor heating or ventilated slab for freezers.
- Thermal breaks at doors, columns and pipe penetrations.
Preliminary cold store estimate
Enter floor area, clear height, temperature and panel material. The estimate combines layout, materials, a project brief and budget in one result.
1. Layout
2. Building materials
3. Budget
| Insulated panels | USD 40,021 |
| Floor insulation / heating | USD 8,000 |
| Refrigeration equipment | USD 115,200 |
| Insulated doors | USD 9,000 |
| Pallet racking | USD 70,920 |
| Installation labour | USD 38,805 |
| Electrical & controls | USD 19,707 |
| Contingency (10%) | USD 30,165 |
| Indicative total | USD 331,819 |
4. Project brief (copy for suppliers)
Cold store, Chilled 0…+4 °C, 400 m² × 8 m clear height, PIR 100 mm panels, approx. 788 pallet positions, approx. 128 kW refrigeration. Indicative budget USD 331,819. Please quote on these assumptions.
Rough planning estimate using general assumptions (40/60 W per m³, 1.9 m² per pallet position, typical panel prices). Excludes land, building shell, permits, taxes and freight. Not a quotation.
Get this reviewed — start an RFQThis guide is planning-level information, not engineering design or a quotation. ColdMatch Group is supplier-neutral: we structure the project, prepare the request and research suppliers. We do not design, manufacture, install, certify or sell equipment, and every introduction is reviewed manually.
Frequently asked questions
How thick should freezer panels be?
For −18 to −25 °C, PIR/PUR panels of about 150–200 mm are common. The final thickness depends on the outside design temperature, energy targets and local rules.
What is the difference between PIR and PUR panels?
Both insulate similarly, but PIR has a different chemical structure that generally gives better fire performance. Check each product's declared fire classification.
Does a chilled cold room need floor insulation?
Rooms above 0 °C sometimes use only perimeter insulation, but freezer rooms always need an insulated floor with frost protection below.
What is the thermal conductivity of PIR panels?
Around 0.022–0.024 W/m·K according to manufacturer declarations, compared with roughly 0.035–0.040 W/m·K for mineral wool.
What fire rating do insulated sandwich panels have?
It varies by core and product. Mineral wool panels can reach non-combustible classes, and PIR usually performs better than PUR. Always check the product's certified class against local requirements.
How long do cold room panels last?
Service life depends on joint sealing, vapour control, cleaning and damage from trucks. Ask suppliers for their stated warranty and maintenance requirements rather than relying on a general figure.
Related guides
Turn your project needs into a request suppliers can price
Share the product, temperature, capacity, location and timeline. ColdMatch Group reviews each request manually, prepares a project brief, then researches and introduces relevant independent suppliers (projects from around USD 250,000).