F1GURE NO. 215.2-GUARDRAILS
Treads - minimum tread depth shall be 10-inches.
Runners - maximum riser height shall be 7 3/4-inches.
Handrails - shall not be less than 34-inches nor more than 38-inches.
R-21 S.2-Guardrails. The code requires guardrails for open sides of stairways and around porches, balconies or raised floor surface when the distance to grade or another floor is 30 inches or more. The diagram above shows an example of the combined code requirements for guardrails and handrails.
Balusters - distance between balusters shall be no more than 4-inchs.