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18.1 Stairs: Box Steps

Common deck stairs are two boards wide with kickplates. All rises must be the same height with a maximum rise of 8” (7-7/8”). Decks requiring only one step generally have box steps. Decks requiring more than one step are decks with double box steps or riser stairs.

Single Box Step

Deck single box step framing details.


  1. Most stairs are 2 deck boards wide
  2. Maximum stair rise is 8”
  3. Cutting framing trim 3 ½ “ less than finished measurement reduces material waste when cutting front trim
  4. Do not trim backside of step
  5. Mitre corners of trim

Double Box Step

Deck double box step framing details.


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