Cold Storage Floors

• Joint opening and edge damage as the slab contracts at low temperature
• Cracking from thermal gradients during pull-down and defrost cycles
• Frost heave or vapour problems where insulation and vapour control are compromised
• Damage at door thresholds between temperature zones
• Slow or impossible repairs because the room cannot be warmed up

In a freezer the slab shrinks further than a normal floor because it also cools, so saw-cut joints open wider and stay open. Sealants fail at low temperature, edges are unsupported and forklift wheels break them down; repairs need the room warmed up, which stops operations.

• Construction joints at pour limits, detailed for low-temperature movement
• Isolation joints at columns and penetrations through the insulated floor
• Threshold joints at doors between freezer, chiller and ambient areas
• Movement joints matching the building structure where present

How the remaining joints are armoured →

Why do freezer floor joints open more than joints in a normal warehouse?

A freezer slab shrinks from drying like any other slab and then contracts again as it is cooled to operating temperature. The two movements add up, so joints open wider and stay open while the room is cold.

Why is repairing a cold-store floor so disruptive?

Most repair materials need the slab warmed up to cure, and warming a freezer means stopping operations and moving stock. Designing the joints and crack control correctly at the start avoids that cost.

What is different about a slab on insulation?

The insulation is softer than a prepared subbase, so loads spread differently and the slab deflects more under rack legs and wheels. Slab thickness, reinforcement and joint load transfer have to be analysed for that support.

How should door thresholds between temperature zones be handled?

Thresholds are where the floor build-up, the temperature and the traffic all change at once. They need a dedicated joint and edge-protection detail rather than a standard contraction joint.