Properly insulated containers stop condensation, regulate temperature, and make a comfortable working or living environment. Phil fits three methods — the right one depends on your budget and use.
| Method | U-value | Thickness lost | Best for | Approx cost (20ft) |
|---|---|---|---|---|
| Spray foam (open-cell) | ~0.35 W/m²K | 50–75mm each side | Storage, budget offices — fast and effective | From £500 |
| Spray foam (closed-cell) | ~0.25 W/m²K | 50mm each side | Welfare units, offices — better vapour barrier | From £800 |
| Rigid PIR board (e.g. Kingspan) | ~0.20 W/m²K | 75–100mm each side | High-spec offices, classrooms, homes | From £1,500 |
| Timber stud lining + PIR | ~0.18 W/m²K | 100–125mm each side | Full conversions — best thermal performance | Included in full conversion quote |
Costs are approximate and depend on container size, condition, and finish level. Phil quotes on-site after inspecting the container.
An uninsulated container gets very hot in summer (steel amplifies the sun) and very cold in winter. It also suffers from condensation — water dripping from the ceiling onto your goods. Insulation solves all three problems. It's the single most impactful modification you can make to a container.
The right method depends on how you intend to use the container and how much you want to spend. Spray foam is the quickest and cheapest route — suitable for storage and basic offices. Rigid PIR board with a lined finish is what you want for offices, classrooms, and any space people will occupy day-to-day. A proper stud-framed lining with PIR is the gold standard for full conversions.
Condensation is a separate problem that insulation addresses indirectly — but it's worth understanding why it happens before deciding on your approach. Phil sees it regularly and can advise. For a detailed explanation, read our guide on shipping container condensation — why it happens and how to stop it .
Hot
Steel amplifies summer heat — an uninsulated container can reach 60°C+ internally on a sunny day.
Cold
In winter, steel conducts heat away rapidly. Insulation is essential for any occupied workspace.
Wet
Condensation forms on cold steel surfaces. A vapour barrier with correct insulation eliminates it.
Container Cladding
Timber, composite, or insulated panels — changes the look and adds weather resistance.
Doors & Windows
Personnel doors, roller shutters, and windows cut and fitted to your spec.
Container Conversions
Offices, classrooms, welfare units — insulation is included in every full conversion.
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Price it up yourself
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Or just ring Phil on 020 8226 0007 — he answers his own phone.
Cambridge Containers Order Desk Ref QT-0000-0000 020 8226 0007 Call Phil