Heavy floor loadings and the use of ride-on electric trucks demand a strong, hard-working floor surface, which must be within the insulation envelope. Floor construction starts with a firm concrete foundation slab of about 100–250 mm below the final floor level. This is covered with the vapor barrier, probably of overlapping layers of heavy-gauge polythene sheet. On this is placed the insulation board in two layers with staggered joints; this is fitted as tightly as possible.
Bitumen building paper is used to cover the surface and prevent penetration of the insulation joints by the floor slab.

The concrete floor itself is reinforced with steel mesh and is laid in sections, to allow for contraction on cooling. It can be floated in strips up to 100 m long and these are subsequently saw-cut when partially
cured. The saw cuts are usually underneath the rack locations to avoid joints in the forklift truck paths. As the floor shrinks, the saw cuts open up and can finally be filled with hard-setting mastic.
The need for good design and expert installation of floor finishes cannot be emphasized too strongly. The floor receives the greatest wear of all the inner linings, and once the temperature has been reduced in the store, it will usually remain low for the rest of its life. Repairs to damaged floors require the use of low-temperature epoxy resins or low-temperature cement mixes. Where a store is to take post-pallets, or will have internal racking to store pallets, careful calculation is necessary of the load on the feet. They can have a considerable point load, having the effect of punching a hole through the floor finish.

Polyurethane (PUR) Insulated
It is used in cold room floors. It has a distributed load-carrying capacity of 2000 kg / cm². The upper surface of the panel is formed by 10 mm thick plywood. Optionally, non-slip CrNi or PVC-coated sheet metal can be used on the plywood layer. There is a lock system on the floor panels.