The Outie ISW is attached to the window casing or interior trim.
The Innie ISW fits inside the window casing or the interior stop.
Outie ISW Edge and Corner Detail
Weatherstripping is squeezed between the Outie ISW frame and the window casing, and between the ISW frame and the window sill. The ISW is attached with thumb screws and EZ-Lock threaded inserts.
Innie ISW Corner Detail
For the Innie ISW, the weatherstripping is squeezed between the ISW frame and the window stop, holding the ISW in place.
Let's make an Innie ISW
Click on the image above to see how to make an Innie. It's easy and fun!
Let's make an Outie ISW
Click on the image above to see how to make an Outie. It's also easy and fun!