Shipping Container Insulation — 5 Methods Compared for AU Climate

Australia is a land of extremes – a country with hot and humid tropics in the north and surprisingly vast snowfields in the south.

Insulation is key to comfort here, particularly if you’re living, working or storing valuable goods in a big metal box.

Shipping container insulation can seriously enhance your container conversion, whether you’re turning yours into a site office, tiny home or secure storage.

But what is the best insulation for shipping containers in Australia? In this guide we’ll review your options, and the factors and considerations that should inform your choice.

Why insulate a shipping container?

Shipping containers are made of steel, which has high thermal conductivity – it gets very hot on hot days, and very cold on cold days.

The primary role of shipping container insulation is to maintain a more stable, comfortable temperature within the container. This is particularly important if you plan to live or work in the container.

But insulation performs other roles too:

• Moisture control: Insulation can minimise humidity and condensation, to prevent rust, mould and mildew, and to protect items that might be affected by moisture.
• Noise reduction: Insulation can deaden noise, which can be particularly valuable for construction site offices and tiny homes in built-up areas.
• Energy efficiency: Quality insulation can significantly lower your power bills if you plan to control the temperature of the container with a HVAC system.
• Protection and longevity: If you live in a particularly hot and humid area, like the tropical coasts of northern Australia, external insulation and condensation control is worth considering, as it further protects the steel structure from moisture.

To this last point, shipping containers are made from corten steel, which is designed to form a layer of rust that protects the metal beneath. While too much rust is bad, the right amount of rust is actually good for the container.

Types of shipping container insulation

The reasons for insulating your container are compelling. But to maximise the benefits that this lining can bring, you need to choose the right type.

What to consider before starting

For great performance at the right price, professionally installed spray-in foam is the most compelling shipping container insulation option.

If cost is your key concern, and you’re confident in your DIY ability, foam boards or insulation kits can provide a decent level of insulation for a far lower price, although you do need to factor in the time you’ll spend on the installation.

But while installation, performance and cost are perhaps the key considerations for your choice of insulation, there are a few other factors that you should keep in mind:

• Moisture control: If you live in a rainy or humid part of Australia, vapour barriers and proper sealing are critical to stop mould and mildew. Poorly sealed interiors can trap moisture between the steel wall and insulation, so ventilation gaps or breathable layers are important too.
• Thickness: Thicker insulation tends to offer better performance, but it cuts into the limited space within the container.
• Fire safety: It’s important to choose materials that align with local fire safety regulations, and that give you the protection you need from fire dangers, particularly in commercial settings.
• Maintenance and longevity: Choose an insulation that will last an appropriate length of time with minimal maintenance, particularly for permanent additions to a property.
• Doors and windows: Badly installed doors, single-glazed windows and unsealed gaps can nullify the effectiveness of insulation.
• Compliance: Insulation materials must meet Australian building standards, especially if you’re undertaking a container home or site office conversion.

Professional vs DIY installation

Should you install shipping container insulation yourself, or hire a professional to do the job?

While the cost savings of DIY are tempting, there are a number of compelling reasons why a professional job might be worth the extra investment:

• Performance and longevity: Expertly installed insulation will typically perform better and last longer than DIY installation.
• Access to the best: Spray-in foam – the highest performing, longest lasting shipping container insulation – can only be installed by certified professionals with specialist equipment.
• Warranty and compliance: Professionals will ensure your insulation aligns with building codes and insurance rules, is installed correctly, and any issues are covered by warranty.
• Time and labour: Installing shipping container insulation is a unique and somewhat complex job that can be time-consuming to learn as you go.

By partnering with an expert team like shipping-containers.com.au for your insulation, you make an investment in your container conversion project. You protect the people and valuables inside from the harsh Australian climate, and you create a space that can be used for whatever you choose.

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