Balustrade and Railing Building Code
The
4" Sphere Space Requirement Rule
The 4" Sphere Rule gives the maximum center-to-center distance between
Balusters and still does not allow a 4" sphere to pass through at any point
beteen the Balusters.
When laying out Balusters, use the maximum center to dimension or smaller
to allow for a safe dimension to pass the 4" sphere space requirement rule.
Minimum Height Requirements
The minimum height requirement states that the balustrade system must be a
certain height from the floor to the highest point of the top rail. The residential
height requirement is 36" and the commmercial height requirement is 44".
Building Code varies from county to county. Consult your local agency responsible
for regulating building code for more specific code information.
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