---
title: "container insulation: Definition and Meaning | NPSA"
description: "Container insulation is material added to the walls, roof and floor of a shipping container to slow heat flow and reduce condensation."
url: https://npsa.preview.multisites.ai/glossary/container-insulation
publisher: National Portable Storage Association (NPSA)
phone: "(816) 960-6552"
email: info@npsa.org
---

Modifications

# container insulation

Container insulation is material added to the walls, roof and floor of a shipping container to slow heat flow and reduce condensation. The choice of system affects comfort and cost. It is often paired with lining and HVAC. Types and thickness vary by seller.

## Why it matters

A bare steel box heats up in the sun and gets cold in winter. Insulation helps keep the inside more stable, which matters for offices, workshops and storage of sensitive items. Operators offer several systems, and each has a different cost and thickness. A common mistake is to add insulation without managing moisture. Trapped water can cause rust and mold. Insulation also takes inside space, so inside dimensions shrink. High cube units are popular for conversions because the extra height leaves room for insulation and a ceiling. Ask what material is used, how it is sealed and what the finished inside size will be.

[Read: Container modifications for rental: Doors, windows, lock boxes and HVAC](https://npsa.preview.multisites.ai/guides/container-modifications)

Definition source: [sentinelcontainers.com](https://www.sentinelcontainers.com/blog/shipping-container-modifications)

## Related terms

[### container HVAC Container HVAC is a heating, cooling and ventilation system fitted to a shipping container. It is used when people work in the box or when contents need a steadier temperature. It usually goes with insulation and electrical work. Systems and sizes vary by seller and use.](https://npsa.preview.multisites.ai/glossary/container-hvac)[### container modification A container modification is a change made to a standard shipping container. It covers a single door cut-in up to a full fit-out. Common changes include doors, windows, vents, insulation, electrical work, HVAC, lining, partitions and plumbing. Sellers often group these changes into packages.](https://npsa.preview.multisites.ai/glossary/container-modification)[### high cube container A high cube container is a container that is taller than standard, usually 9 feet 6 inches tall outside, compared with 8 feet 6 inches for a standard unit. It is often written HC or HQ. The extra height adds inside room.](https://npsa.preview.multisites.ai/glossary/high-cube-container)[### insulated container An insulated container is a container with insulation on its walls and roof to slow heat transfer. In portable storage, insulation is often added to a standard steel box, for example with spray foam. It differs from a reefer, which has a refrigeration unit.](https://npsa.preview.multisites.ai/glossary/insulated-container)[### climate controlled storage Climate-controlled storage is indoor storage built to hold a more even temperature, and sometimes humidity, than an ordinary unit. Facilities describe it with words such as air-conditioned, heated or humidity-controlled, and features differ by site, so a customer should ask what the unit actually offers.](https://npsa.preview.multisites.ai/glossary/climate-controlled-storage)[### mobile office A mobile office is an office space that is built and finished off site, then delivered ready to use. It can be a converted storage container, a trailer or a modular building. Standard units typically come with insulation, finished walls, flooring, electrical wiring, lighting, a personnel door and a window.](https://npsa.preview.multisites.ai/glossary/mobile-office)

[All 220 terms](https://npsa.preview.multisites.ai/glossary)

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