utilities Calculator Scenario

Code-Compliant Stair Design

Building codes specify riser and tread dimensions for safety. Getting these right is critical for comfortable, safe stairs.

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Key Considerations

  • 1Max riser: 7.75 inches (IBC), 7 inches (IRC)
  • 2Min tread: 10 inches (IBC), 11 inches (IRC)
  • 3Comfortable rule: 2R + T = 24-25 inches
  • 4All risers must be uniform (max 3/8 inch variance)

Applicable Standards

IBC 1011IRC R311.7

Scenario Parameters

mode
totalRise
total Rise
108
building Code
irc
stair Type
straight
stair Width
36
include Nosing
true
unit
in

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