Cold Store Design: Insulation, Vapour Control, and Structure

Cold store construction is unforgiving. A small thermal bridge or vapour seal failure causes ice build-up, structural distress, and operational failure. Specifying robust details from the start avoids decade-long maintenance battles.

Operating temperatures

• Chiller: 0–4°C
• Cold store: -18 to -25°C
• Blast freezer: -30 to -40°C

Insulation

PIR or PUR panel typical:

• Chiller: 80–100mm wall, 100mm roof
• Cold store: 150–200mm wall, 200mm roof
• Blast freezer: 200mm+ wall, 250mm+ roof

Vapour seal

Critical for low-temperature stores. Warm moist air migrating through insulation condenses and freezes, swelling and destroying panels. Sealing strategies:

• Continuous vapour barrier on warm side
• Sealed panel joints with butyl mastic
• Door frame sealing details
• Service penetration sealing

Floor

Insulated slab construction:

• Sand blinding
• Heating mat (prevents subgrade frost-heave)
• Slip membrane
• Insulation (typically 150–200mm extruded polystyrene)
• Vapour membrane
• Reinforced concrete slab

Heated slab

Under-floor heating mats prevent the ground freezing solid below the cold store. Critical — without it, frost-heave lifts and cracks the slab over winters.

Structure

Steel within cold store often left uninsulated (cold steel), with insulated panels separating it from internal volume. External steel structure can be standard but penetrations through envelope need thermal break.

Doors

Heavy specialist insulated sliding doors. Air locks for high-frequency access. Strip curtains supplement.

Common failures

• Vapour seal breakdown at joints
• Under-slab heating failure causing frost-heave
• Door seal degradation
• Service penetrations not sealed correctly

MCFAR engineers cold store and chilled facility construction.

Frequently Asked Questions