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Clarifying Bracket Clearance
Posted by Tony L. on 20 June 2008 08:00 PM

Required clearance between a handrail and other building elements continues to confound and confuse. Here's a quick review of where present codes now stand.

The 1992 Americans With Disabilities Act Accessibility Guidelines (ADAAG) stated that there was to be an absolute dimension of 1-1/2" between a handrail and a wall. This was actually a "grab bar" dimension which was part of an old version of ANSI A117.1. It's purpose was to avoid someone from getting caught between the wall and the handrail. ANSI changed the notation to 1-1/2" minimum in 1990.

This was not the case with ADAAG which took 20 years to be updated. The 2010 ADA Standards for Accessible Design now requires a 1-1/2" minimum, as does the ICC, IRC and ANSI A117.1. 

The National Fire Protection Association (NFPA) however is not on the same page with their requirements. Originally created as part of their building code -- NFPA 5000 -- but now included in NFPA 101 -- Life Safety Code, the NFPA requires a 2-1/4" clearance between the wall and the handrail.This may result in a railing that will be passed by the building inspector but not accepted by the fire inspector. Some jurisdictions have not adopted this requirement. Confirm with your local fire inspector.

Codes also generally require that there be a 1-1/2" clearance between the underside of the handrail and any obstruction -- including the horizontal bracket arm. There is an allowance however for variations in the handrail size -- for every 1/2" of additional perimeter dimension over 4", you may subtract 1/8" from the clearance requirement. For example:

OD
Perimeter

Subtract from
1-1/2" Requirement

Clearance From
Underside of Railing
1.25"
3.92"
 
1-1/2"
1.50"
4.71"
-1/8"
1-3/8"
1.66"
5.21"
-1/4"
1-1/4"
1.90"
5.97"
-1/2"
1"
2.00"
6.28"
-1/2"
1"

As always, we strongly recommend that you confirm all code issues with your local officials prior to specifying.

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