403.2 Floor or Ground Surface.
Floor or ground surfaces shall comply with 302.
The running slope of walking surfaces shall not be steeper than 1:20. The cross slope of walking surfaces shall not be steeper than 1:48.
403.4 Changes in Level.
Changes in level shall comply with 303.
Walking surfaces shall provide clearances complying with 403.5.
Where handrails are provided along walking surfaces with running slopes not steeper than 1:20 they shall comply with 505.