How can I tell if I am installing the gutter guard too flat or too steep?

As long as you retain between a 5 and 25 degree forward slant (positive slope) on the gutter guard once installed and ensure you have the front edge of our gutter guard lay flat on the front edge of your gutter, then you should achieve optimal performance.

 Note: Between a 5 to 25 degrees forward slant (positive slope) is also equal to approximately a 1/12 to 6/12 pitch. If your roof is steeply pitched or your gutter is hung low, it is recommended to drop the slope of the gutter guard to between 5 and 10 degrees.