Close the door and take note of where the light is coming through.

This will highlight the area you are trying to seal.

Measure the width of the door gap to the closest increment possible to acquire the appropriate door gap tape thickness.

The thickness of the gap tape will vary based on the width of the gap of each unique door. However, most door gaps can be closed with 1/8, 1/4/ 3/8, or 1/2 inch gap tape. In this example, we will be using 1/8 inch tape.