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About Containers


Insulating a Shipping Container

By February 27th, 2012 About Containers 12 Comments

Insulating a Shipping Container

It is becoming more and more popular as a form of modified storage containers to insulate the interior of a shipping container or storage container.  There are several different ways to go about doing so.  The more commonly used materials for containerized applications are fiberglass, rigid polystyrene foam panels and closed cell spray foam.  There are also some coatings on the market that offer insulating qualities as well.  However, for the purposes of this article, we are going to discuss the three options mentioned.

Fiberglass Insulation –The fiberglass insulation we use is a standard thickness of 3 ½” and will provide an insulating value of R-13.  The sections are cut and fitted inside of a wood framed interior.  We don’t make any penetrations to the exterior of the container when constructing the wood frame.  The fewer penetrations you make to the exterior of the container the better.  The 2” x 4” wood studs are mounted 16” on-center.

The walls of a storage container are corrugated.  There will be gaps between the insulation and the outside corrugation.  Depending on where the storage container is going, you may consider putting a moisture barrier between the container wall and the insulation.

Rigid Polystyrene Foam Panels – The foam panels are available in varying thickness as well as the size of the panels.  The panels also come in varying densities (depending on just how rigid a panel you require).  Your application will dictate the type of panel you utilize.  The foam panels will provide an approximate insulating value of R-5 per inch.  The major benefit of using foam panels over fiberglass is the interior space you can save.  When installing foam panels, they can either be glued directly to the corrugated walls of the shipping container or screwed into flat bar mounted to the container walls.  You don’t need to wood frame the interior of the container as with fiberglass insulation.   Thus saving several inches on the sidewalls and ceiling.  **We recommend the flat bar method as opposed to gluing the panels to the container walls.  Because the storage container walls are corrugated, the panels do not come in constant contact with the walls.  For every section of the panel that spans an outside corrugation, it is not adhered to the container wall.

Closed Cell Spray Foam – In our opinion, closed cell spray foam is the most efficient insulation.  It will offer the highest insulation value (approximately R-6 per inch).  The spray foam completely covers the surface of the corrugated shipping container walls.  There are no gaps between the insulation and the container’s wall (as there are with fiberglass or polystyrene panels).  There is much less risk of condensation or moisture developing with closed cell spray foam.  There is no need to frame out the interior as the spray foam adheres directly to the sidewalls and ceiling of the storage container.  It can be sprayed as thick as necessary to achieve whatever insulating value you require.  The one con to this type of insulation is the cost.  It can be the most cost prohibitive of the three methods.  This is primarily due to what is required (labor and materials) to install a wall covering over the spray foamed walls (should it be necessary).

Any of these methods are a very effective way to insulate the interior of your shipping container or storage container.  Contact us today to discuss your options and figure out which method is right for you.  For more modified storage container ideas visit the storage container modification section of our website.

**We recommend that a wall covering (Hardie Paneling, plywood or plywood with an FRP overlay) is installed over the insulation to finish out the interior.  We will address these wall coverings in a future article.

 

Written By:  Ray Gregorio, Container Technology Inc.




12 Comments

  1. Al
    February 28th, 2012

    Would foil and bubble insulation work as well?

  2. admin
    February 29th, 2012

    Hello Al,

    Thanks for your comment. There are many different types of insulation. I’m sure bubble or foil insulation would work as well. The three mentioned in the article are the types of insulation we utilize most often. Ray

  3. Norcliff Wiley
    May 9th, 2012

    Please explain the flat bar method for installing foam panels. What type, size bar? How is it mounted? How many is best?

  4. admin
    May 9th, 2012

    Hello Norcliff,

    We typically use 1/8″ thick x 4″ sections of flat bar and tack weld it to the inside corrugation of the container. The flat bar runs the length of the container walls and ceiling. Each panel comes into contact with a section of flat bar in three places (one near the top, one near the middle and one near the bottom). We use self tapping screws to hold the panels in place. We’ve also used 1″ x 2″ and 2″ x 2″ steel tubing (to act as studs) to mount the panels as well. In this case, the tubing would run between the corrugation from top rail to bottom rail. The tubing is tacked to the top rail and bottom rail. I hope this information is helfpul. Please feel free to contact us should you require any additional information.

  5. david mcdonald
    December 26th, 2012

    With the fiberglass installation, how are the 2×4 wood studs secured/mounted to the container wall/ceiling?

  6. admin
    December 28th, 2012

    Hello David,

    Thanks for finding us online! When framing out the interior, we dont’ make any penetrations to the exterior of the container. We nail the 2×4 studs together (16″ on center) and they hold each other in place. It’s very easy to do. If you have any additional questions, please feel free to reach out to me directly. My email is ray@containertech.com. Happy Holiday’s!

  7. September 4th, 2013

    This is very helpful. You see, I’m planning to buy a used shipping container from PortContainerServices.com.au so I can use it as a mobile office. The heat that is absorbed and radiated from the steel structure needs to be alleviated. Can asbestos be a good insulator? It’s the only material available in the hardware store in my community. Thanks.

  8. admin
    September 5th, 2013

    Francis,
    Thank you for your interest in our website. Containers make great mobile offices. Unfortunately we do not use asbestos when insulating a container. We only utilize the type of insulation that you viewed on our site. I do not have any experience with that type of material. You may try reaching out to the ISBU. They may have some more information and can better assist you. – http://www.isbu-info.org/permalink/article_2008_dec_isbu_arch-draw-cad.htm

  9. iDesign2Build
    November 10th, 2013

    Hi, I am designing a home with 7 high cube 40″ containers. I want to insulate the external walls panels from the outside and save room for internal space. On the external I am thinking of using a sandwich wall composed by: bubble wrap insulation, horizontal timber stub of 40-50mm to fix the bubble wrap to the container wall panel, then another lay of bubble wrap then FC sheeting. What do you think?

  10. admin
    November 14th, 2013

    Hello. Thanks for your comment! There are many different ways to insulate a container. You’ve described a method that we did not cover in this article. To be honest, we don’t have any experience with this type of method. We’ve not used this type of insulation for our customers. However, that certainly does not mean it won’t be affective for you. There are many factors to consider when insulating any structure. The size of the structure, what the structure is comprised of, the climate in which the structure is located, the HVAC system in the structure, heat transfer, moisture and some other factors should be considered. As long your insulation is installed properly (no matter the type) and it is suitable for your environment/structure…I would think you should be okay. I’m sorry I can’t speak in more detail about the method you’ve described and hope this information is helpful. Ray

  11. PTS
    April 7th, 2014

    I am in the R&D phase of using a shipping container for an single office. I have narrowed down my insulation search to most likely spray foam. What kind of wall covering do you recommend that’s eco-friendly? Have you any experience with Magnesium Oxide panels?

  12. admin
    April 15th, 2014

    Thanks for the comment! We have not used Magnesium Oxide panels. We primarily use a Hardie Paneling/Siding. It’s typically utilized for exterior applications. However, we’ve found it to be a very versatile product and works very well for shipping container applications. Here is a link to Hardie’s website – http://www.jameshardie.com/homeowner/products_siding_hardiepanelSiding.py If you are located in the US, you can purchase the panels at Home Depot – http://www.homedepot.com/p/James-Hardie-5-16-in-x-48-in-x-96-in-HZ10-HardiePanel-Sierra-8-Vertical-Siding-217863/100072921?keyword=553-777 I hope this information is helpful.

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