Building a Double-Wide Shipping Container Home: What We Would Do Differently Today
Building a double-wide shipping container home can create a surprisingly spacious and comfortable interior, but there are several structural, insulation, and moisture-control challenges that need to be planned before construction begins.
In this video, Channing tours one of The Container Guy’s earliest double-wide container builds. The structure was made from two used 40-foot high-cube shipping containers and was originally intended to become a family cabin. Instead, it became office space and has been used successfully for years in Saskatchewan’s extreme climate.
Creating an Open-Concept Container Home
Strategically placed wall openings were cut between the two containers to create a more open interior while leaving portions of the original walls in place for structural support.
The finished layout includes a living room, bedroom, kitchen, bathroom, storage, laundry area, and office space.
Even with two containers joined together, individual rooms inside a single container width can still feel narrow. Once framing and wall finishes are installed, the usable interior width can be around seven feet.
Large windows and glass doors help make the space feel much more open.
Heating, Cooling and Air Circulation
The building was able to handle Saskatchewan temperatures ranging from approximately -40°C to +30°C.
A mini-split air conditioner was added later, while electric heat was used throughout the structure.
One issue was air circulation.
Because there was no traditional ducted HVAC system, the interior sometimes felt stuffy. A ceiling fan and a through-wall circulation fan were eventually added to help move air between the bedroom, hallway, and kitchen.
Today, a more complete ventilation strategy would be planned from the beginning.
Problems With the Original Window Frames
One of the biggest mistakes was using hollow rectangular steel tubing around the windows.
The steel created a direct thermal bridge between the exterior and interior. During cold weather, condensation formed on the window framing and was absorbed by the surrounding trim.
That created conditions where swelling, mould, and mildew could develop.
Today, Container Modification World Window Framing Kits would provide a much better solution because they allow insulation to continue around the opening and help reduce thermal bridging.
Wood Framing vs Steel Studs
The original container was framed with traditional 2x4 lumber.
Wood can absorb moisture, especially when it is positioned close to cold steel surfaces.
If the project were built again today, Channing would use Container Modification World Steel Stud Brackets with thinner steel studs.
Using 1 5/8-inch or 2 1/2-inch steel studs leaves more usable interior space and allows closed-cell spray foam to extend behind the framing, helping create a more continuous thermal and vapour barrier.
Insulating the Floor and Walls
The floor was built using two inches of rigid foam followed by 5/8-inch tongue-and-groove plywood.
Closed-cell spray foam was then used throughout the walls and ceiling.
One problem was the original structural header system. Laminated 2x10 lumber was installed along the walls and fastened through the container corrugations.
Because spray foam could not surround the lumber, large thermal bridges were created.
The system worked better than expected, but it is not something Channing recommends repeating.
A Better Double-Wide Container System Today
If this project were built today, Container Modification World’s Double-Wide Kit would provide a much cleaner approach.
The kit allows a structural header to span the opening between two containers and can create a much larger clear-span interior.
The containers can also potentially be modified individually, transported separately and connected at the final site.
That makes construction and transportation much easier than finishing a complete double-wide structure before moving it.
The biggest lesson from this early container home is that planning the structural system, insulation, framing and moisture control before construction begins can make the entire project easier, more durable and more comfortable.