Handrail (baluster spacing)

[Trent Tarter]

I commonly call out guardrail spacing that is over 4 inches. However I am wondering if there are some exceptions to this rule. I find it very common that metal handrails at entry steps have balusters that are over 4 inches. Is there an exceptions to this rule in locations such as front and rear entry steps.

[Rick Cantrell]

Currently the exception is if 30" or less to surface.
The 4" rule is not all that old, someone may be able to tell you when it was enacted.

[chris mcintyre]

Spacing between step rail balusters must not allow a 4 3/8" sphere to pass through.


Edit: Someone recently posted this pdf, think it was MT but I'm not sure.

See page 13.