Protecting Your Investment: Ways to Prevent Shipping Container Sweating

There are plenty of great reasons to buy a shipping container. They are a practical and affordable storage solution and also provide the ideal basis for conversion projects like container offices and homes. Shipping containers are extremely durable and require minimal maintenance, but there are a couple of challenges that you should be aware of.

One of the main issues that affects shipping containers is container sweat or condensation. This is caused when two different temperatures meet. It usually occurs during the night, when the container cools and heat escapes through the roof of the container. This causes a layer of sweat to form when the moisture in the air condenses against the cold surfaces of the container. Some container sweat is to be expected, although too much moisture can damage the contents of your unit and cause issues such as mould and mildew. If you are worried about container sweat damaging your unit or goods, then here are some simple ways to prevent shipping container sweating.


Vents are installed in all standard shipping containers to ensure ample airflow while still keeping the container watertight. In most cases, proper ventilation is sufficient to manage shipping container sweating. However, you may need to take additional anti-sweating measures if you have significant sweat forming in your container. If you are placing containers next to each other, then ensure that you don’t accidentally cover container vents. Obscuring container vents will reduce air flow and is likely to lead to an increase in sweating within your shipping container.

Anti-sweating coating

Anti-sweating coating – also known as Grafo-Therm Anti-Condensation Paint – can be applied to the interior of your container to help prevent sweating. Generally, the paint is applied to the roof of the container along with the top six inches of the interior sidewalls. Anti-sweating coating is designed to provide extra insulation and absorb excess moisture in the air. This helps to reduce sweating from forming within the shipping container. 


Dehumidifiers extract excess moisture from the air to help prevent sweating from forming in your container. A dehumidifier requires electricity to operate and so you need to have access to a nearby power source. The collected water must be removed from the container regularly to prevent it from being reabsorbed back into the air. Some dehumidifiers have an automatic on/off feature which uses sensors to detect moisture in the container.

Moisture traps 

Moisture traps work in a similar way to dehumidifiers, but they are a cheaper option and have minimal costs once installed. There is a good selection of moisture traps available to purchase. For instance, moisture capture crystals extract moisture from the air and transform it into a solution that can then be collected from the tray and disposed of. You simply refill the tray with new crystals to keep dampness at bay. Moisture crystals are a simple and cost-effective way to combat container sweating and extend the lifespan of your unit and goods. This will help to ensure that you get the maximum return on your investment.

Still have questions about sweat in containers?

If you have sweating in your shipping container, then it is important that you address the issue and take anti-sweating measures to protect your unit. Luckily, there are plenty of things you can do to manage the risk of container sweating and extend the lifespan of your unit and belongings. We are one of the UK’s largest suppliers of shipping containers and have over 40 years of experiencing selling, hiring and converting containers. Our team can provide expert guidance with most applications and queries relating to shipping containers. You can give our specialist team a call to discuss your requirements or view our range of containers online.

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