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Insulating a shipping container: options, costs and what really pays off

16 August 2026

An uninsulated steel container follows the outside temperature almost without delay. In summer it heats up, in winter it cools down, and moisture condenses on the inside of the wall. Anyone using the container as an office, a break room or storage for moisture-sensitive goods cannot avoid insulation.

Why condensation is the real problem

Warm indoor air meets the cold steel wall. The air cools down, can no longer hold the moisture and releases it onto the wall. The result is known as container rain. It is therefore not enough simply to heat; the insulation layer has to separate the warm air from the cold wall.

Spray-applied PU foam

The foam is sprayed directly onto the corrugated wall and cures without joints. It insulates very well with a low build-up depth and at the same time forms the vapour barrier. Disadvantage: the work belongs in the hands of a specialist, and later repairs to the wall are laborious.

Rigid foam boards

Boards of EPS or PIR are fitted onto battens. This can be calculated cleanly and can be carried out as DIY work. What is decisive is airtight workmanship at the joints and junctions, otherwise moisture migrates behind the insulation.

Mineral wool

Mineral wool is non-combustible and noticeably dampens sound, which is a pleasant benefit in office and break-room containers. It needs a greater build-up depth and absolutely requires a correctly installed vapour barrier on the inside of the room.

What this means in practice

For purely dry storage, ventilation is often sufficient. As soon as people work in the container, there is no way around full-surface insulation including the floor and ceiling. Our office containers and sanitary units are delivered insulated ex works; for custom-made items we agree the construction with you in advance.

Suitable containers from our stock

Suitable containers in the shop

Further reading

BackInspecting a used shipping container: what to look out for before buying