Cold Storage Panel Thickness Guide for Different Temperature Zones

Client called me three years ago. Brand new freezer facility. Compressors running blind, zero shutoff. Ice thick on the interior walls. Utility overhead bleeding him dry. The diagnosis was simple. Catastrophically underspecified panels. Wrong core. Inadequate thickness. Panel spec dictates compressor lifespan. Period.

+5°C to +10°C: Chillers and Produce Baseline cooling. 75mm to 100mm panels. PU core functions perfectly here. 0.022–0.024 W/m·K thermal conductivity. Do not drop below 75mm. Efficiency falls flat.

0°C to -5°C: Chiller Rooms Phase change territory. Moisture becomes frost. 100mm is the strict minimum. Protect the thermal barrier. PU remains acceptable.

-5°C to -18°C: Freezer Rooms Frozen protein. Seafood. Ice cream. 120mm to 150mm required. Switch to PIR immediately. 0.018–0.020 W/m·K. PU loses cost-efficiency here. 24/7 refrigeration cycles demand PIR density. Energy savings recover the upgrade cost fast.

-18°C to -25°C: Deep Freezers Long-term bulk storage. 150mm baseline. Zero exceptions. High-risk facilities push directly to 180mm. EPS is permanently disqualified.

-25°C to -40°C: Blast Freezers Vaccines. High-end aquatic products. Rapid temperature drops. 150mm to 200mm. Breaching -40°C pushes requirements to 250mm. PIR strictly mandatory. No alternative cores survive this thermal shock.

Envelope integrity matters. Condensation destroys steel. Z100 galvanization rusts out under heavy washdowns. Specify Z150 minimum. Coastal exposure? Z275. Joint configuration is critical. Tongue-and-groove edges. Heavy sealant application. Micro-leaks destroy cooling efficiency.

At Propanel (propaneltech.com), we match core, thickness, and steel gauge directly to your operating temperatures. Eliminate specification errors. Protect the compressors.