OVERHANG

You can calculate how much overhang you need by following a simple formula : Y=1/2 x ( in most cases). For example, if the measurement from the base of your door to the bottom of your overhang is ten feet, then the overhang should be a minimum of five feet deep. The exposure coefficient may need to be modified based on your climate and the direction your door faces. In some situations, the exposure can be too extremem for a door – regardless of overhang.