How to Build a Deck on Sloped or Uneven Ground Decks.com ...
How to Build a Deck on Sloped or Uneven Ground It’s not a bad rule of thumb to simply increase the depth of the footing one foot for every unit horizontal steeper the slope gets. Between 3:1 and 2:1 slopes, a minimum of two feet deep, and between 2:1 and 1:1 slopes, no less than 3 feet deep.