Shipping Container: Installing Window Flashing

Installing Window Flashing


Section 2

Window and doors installed using one of two approaches;

Window and doors are typically installed using one of two approaches:

    1. Barrier system installation or:
    2. Managed moisture drainage system installation.

InSoFast prefers a managed moisture drainage system for flashing windows.  Engineered and redundit systems approach manages small amounts of water through or around the window openings, draining the water away from the interior. A Barrier system can be made to work too. Barrier systems rely on perfect installation techniques to deflect all moisture. Although this is not to be considered an endorsement or the best method to flash a intermodal window opening their may be better applications for your unique condition. Always flash your windows to the window manufacturer's instructions.

Why use a wood framed window buck;

Why use a wood framed window buck for a Shipping Container.

We use wood bucks for strength and thermal properties.   Wood is a better insulator than steel and we want to reduce the chances of condensation. 

Water Managed Sill Details;

Water Managed Sill Details

For the sill we incorporated a back dam that slopes and drains water away from the interior of the conex shipping container.

The Importance of Air Sealing;

The Importance of Air Sealing

All windows and doors should be air sealed around their entire perimeters expanding foam sealant.


Typical Sill Flashing Detail


Installing the Window


Section 3

Apply Window Sill Flashing,

Apply Window Sill Flashing

Apply a self-adhesive flexible flashing tape engineered for doors-windows. Reinforcing the inside lower, corners of the window with an extra piece flashing membrane. Adhere to the flashing manufacturer's best practice guide lines.

For more in-depth information also review: Exterior Window Detailing Page 

Window installation;

Window installation

Follow the window manufacturer’s installation guidelines and caulk the window opening leaving the sill open for drainage. Shim or lift the window off the sill to allow for moisture to drain away. 

Check to ensure your window is properly sealed and that it will open and close before you proceeds.

Add the flashing tape around the window;

The final step is to add the flashing tape around the window.

Plumb and level the window;

Plumb and level the window

Make sure your window is plumb and level before you mechanically attach it (screw it in) to the wood frame.


Download PDF Instructions


Container installation guide pdf
Container Supplemental installation guide pdf
Insulating a shipping container door pdf

InSoFast Plus Method

Need a higher R-value? No Problem! Start with a base of InSoFast continuous insulation panels they are feature-rich and easy to install. Then add rigid foam insulation over top of InSoFast panels.