Shipping units are a must for use in portable homes, office spaces, construction sites, and others. Still, wherever you have decided to use is, it is crucial to insulate your shipping container, especially if you are planning to store sensitive goods or live in it.
Comfortable interior temperature, humidity, protection against harsh conditions, etc - here are just some benefits of a well-insulated storage container.
Do you want to know all the benefits that insulating shipping containers can bring? Would you like to know how to insulate a shipping container? Or are you looking to buy or rent your very own insulated storage unit? Whatever you need, Midstate Containers has you covered.
Understanding the Importance of Shipping Container Insulation
Although it may seem tempting to just throw all of your belongings into a non-insulated metal box, it can come with severe consequences.
Heat fluctuations outside (even during a day-night cycle) can affect the stored goods drastically. Without proper padding, the metal that the units are made of can transfer the heat or cold directly to the storage, oftentimes rendering it unusable in the end. Depending on your location, the walls of the container can be insufferably hot in summer or freezing in winter, making it uncomfortable and straight away dangerous to work with them.
In addition to that, such temperature drops or leaps can lead to intense condensation, exposing the materials and equipment inside to a lot of humidity. Moreover, poor or no lining means that any external moisture can slip inside, exposing your goods to even more water.
Another benefit of insulating shipping containers is how much more energy-efficient they become. The energy costs for heating and cooling systems can be reduced drastically, allowing the unit to run more efficiently and have less environmental impact.
Types of Shipping Container Insulation from Heat and Cold
There are various materials available for insulating shipping containers, each with its own set of benefits and drawbacks. Understanding these options will help you choose the best insulation for your specific needs.
Spray Foam Insulation
Spray foam is one of the go-to options for unit lining. It is applied directly to the interior walls, where it later expands, creating an airtight seal that fills all the gaps and cracks. Once it is secured, spray foam offers excellent thermal resistance, prevents air leakage, and builds a vapor barrier that minimizes the risk of condensation.
However, spray foam can be more expensive than other insulation options, and it requires professional installation to achieve the best results.
Fiberglass Insulation
If you are looking for the best price-performance ratio, fiberglass is your choice. It usually comes in rolls that can be cut to fit the walls and the ceiling of the container. Fiberglass lining works by trapping air within its fibers, which slows the transfer of heat.
The main downside of fiberglass is that it is less effective at preventing air leaks and doesn’t keep its insulating properties once wet. Therefore, it is recommended to use it in conjunction with some sort of vapor barrier.
Blanket Insulation
Blanket insulation is quite similar to fiberglass. It also comes in rolls and is even made from materials such as fiberglass or mineral wool. Once cut, it is placed between the studs of the container’s framing, making the installation pretty easy and even doable by a DIY enthusiast.
Unfortunately, just like fiberglass, affordability of blanket lining comes with less effective gap fill and the need for additional moisture protection.
Loose-Fill Insulation
Loose-fill insulation consists of small particles of insulation material, such as cellulose, fiberglass, or mineral wool, that can be blown into the walls of the unit. This method is particularly useful for filling irregular spaces and cavities within the container’s structure. In the end, the coverage is consistent throughout the unit.
However, this material requires specialized equipment to install and may not be as effective in extremely humid climates.
Expanded Foam Insulation
Expanded foam insulation is made from polystyrene or polyurethane and is available as rigid foam boards. They can be easily cut to size and attached to the container’s walls, offering superior thermal and moisture control while remaining extremely lightweight.
The main con of going for expanded foam is its price and additional framing for installation, which is needed sometimes.
Mineral Wool Insulation
Mineral wool (a.k.a. rock wool) is made of natural stone in combination with other materials. Due to its mineral structure, this lining material is highly resistant to heat and fire, making it a no-brainer for shipping units in areas prone to high temperatures or fire hazards. Additionally, this material can boast the best soundproofing out of all the other insulation options.
Despite the ease of installation, mineral wood is substantially heavier than the other options, requiring additional support during the installation.
Living Roof
A living roof, also known as a green roof, involves covering the roof of the shipping container with soil and vegetation. This natural lining method provides excellent thermal resistance by protecting the unit from direct sunlight and reducing heat transfer. Additionally, a living roof helps to manage stormwater runoff and improves air quality.
While a living roof is an eco-friendly option, it requires careful planning and maintenance. The additional weight of the soil and plants may require structural reinforcements, and the roof must be properly waterproofed to prevent leaks.
Factors to consider when choosing shipping container insulation
When deciding how to insulate shipping containers, there are several factors to consider. These factors will influence the type of lining you choose and how it performs over time.
Temperature Extremes
Ensure that your insulation of choice fits the temperature modes the container will be in. If it is exposed to extreme heat or cold, you want the lining to keep it out of the contents, making the inner environment more consistent. For these goals, spray foam and extended foam work the best.
Humidity Levels
High humidity levels can lead to moisture exposure inside the container and condensation buildup, often causing damage and mold growth. To combat this, choose insulation that includes a vapor barrier or has moisture-resistant properties. Materials like spray foam and expanded foam are excellent choices for humid environments, as they prevent moisture from entering the insulation. Mineral wool is also a good option due to its natural moisture resistance.
Thickness of Insulation
The thickness of the lining you choose will impact its effectiveness and the amount of interior space available within the container. Thicker material provides better thermal resistance but takes up more room inside the container. Rigid foam boards, for example, offer high insulation values with minimal thickness, making them a good choice for those looking to preserve interior space.
Material Lifespan
The lifespan of the insulation material is another critical consideration. Some lining materials, such as mineral wool and expanded foam, are known for their durability and long-lasting performance. Others, like fiberglass, may degrade over time, especially if exposed to moisture.
Protect your investment and maximize comfort!
Other Thermal Energy Control Ideas That Aren't Really “Insulation”
While insulation is the primary method for controlling the temperature inside a shipping container, there are other techniques that can complement lining and further enhance energy efficiency.
Reflective/Radiant Barriers
Reflective or radiant barriers act like a mirror for heat, bouncing it away from the unit and keeping the interior cooler. These barriers are often installed on the container’s exterior walls or roof, making them a lifesaver in hot climates where beating the heat is a top priority. When paired with traditional insulation, they create an even more effective thermal barrier, especially in areas with intense sunlight that can turn a unit into an oven.
Green Roof
A green roof is an eco-friendly way to keep your shipping container cool naturally. Beyond just insulating, the vegetation on a green roof soaks up sunlight, cooling the container in the process. It’s like killing two birds with one stone: you get lining, and natural cooling all in one go. Plus, green roofs come with added perks like reducing stormwater runoff, improving air quality, and even offering a home for wildlife. Though they need a bit more TLC than other insulation methods, green roofs can dramatically cut down the need for artificial cooling systems.
Passive Heating and Cooling Design
Passive heating and cooling design is all about working smarter, not harder. By strategically positioning the unit and adding design elements like windows, vents, or shading devices, you can naturally regulate the temperature inside. For instance, well-placed windows can boost airflow, cutting down the need for mechanical cooling, while overhangs can block out the scorching sun during the hottest part of the day. These strategies, when combined with proper lining, create a space that’s as comfortable as it is energy-efficient.
Other Container Insulation FAQ's
Why Insulate Shipping Containers?
Insulating shipping containers is essential for maintaining a comfortable interior environment, reducing energy costs, and preventing condensation. Proper insulation ensures that the container is suitable for various uses, from living spaces to storage units, regardless of the external climate.
Why do you need container home insulation?
Living in a metal container without lining can be uncomfortable, as the walls transfer heat and cold easily. Insulation is essential for maintaining a stable, energy-efficient environment, soundproofing, and preventing condensation, which can cause moisture damage.
Moreover, keeping items in such a storage unit can expose them to moisture, extreme temperatures, and condensation.
What is the best insulation for a shipping container?
The best insulation for a shipping container depends on factors like climate, budget, and use. Spray foam is often the top choice for its thermal resistance, gap sealing, and moisture barrier, especially in extreme climates. However, options like expanded foam, mineral wool, or a mix of lining types may be better depending on specific needs. It's crucial to evaluate the environment and choose insulation that balances cost, effectiveness, and longevity.
Should You Put Insulation Inside or Outside?
Lining can be installed on either the inside or outside of a shipping unit, depending on the desired outcome and constraints.
- Inside Insulation: Installing lining inside the container is more common and easier, providing a clean, finished interior using materials like spray foam, fiberglass, or rigid foam. However, it slightly reduces interior space.
- Outside Insulation: Though less common, external lining preserves full interior space and can protect the unit’s metal structure from heat-related wear. It may, however, need additional waterproofing and protective cladding.
What is the Difference Between an Insulated Conex Box and a Regular Shipping Container?
An insulated Conex box is a shipping container with built-in lining designed to regulate internal temperature, making it ideal for transporting sensitive goods or for storage in extreme climates. Unlike standard steel units that lack insulation, Conex boxes provide an all-in-one thermal solution. While regular containers can be customized with lining for specific needs, insulated Conex boxes offer a convenient, ready-made option.
