Stairway Balusters: Guide to Building Code, Construction, & Safety Inspection of Balusters in Railings in Buildings InspectAPedia® -
Stair Baluster Inspections, Defects, & Codes
Stair, railing, guardrail, landing, tread, and step specifications & codes
Stair & railing safety hazards, photos of defects
Sketches of stair design requirements
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This document assists in inspecting the balusters used on indoor or outdoor stairs, railings, landings. A stair inspection checklist provided in this document outlines information to collect during a field investigation of the condition of an interior or exterior stairway for safety defects. Also see Deck & Porch Railings.
For details about balusters (vertical spindles in railing construction) see details at Railings for a discussion of safety barriers along stairs, and Guards (railings on landings and open hallways, porches, screened porches, balconies that are more than 30" above floors or grade).
As our photo shows, a toddler (in this case very carefully held and supervised) can easily fall through open landing balusters or open balusters on a stairway.
We often see guards and railings enclosed using horizontal members or mesh or link fencing materials. Because a toddler can easily climb these materials, they are not safe for guard or railing enclosures and should not be used.
We also often see decks and porches more than 30" above ground level with no rail whatsoever, perhaps relying on the placement of plants or furniture to discourage people from stepping too close to the edge.
Where building code enforcement was absent or lax we found a deck eight feet above ground with no railings at all. A local inspector opined that because the deck was not attached to the house (it abutted the house) it was exempt from building code enforcement.
Our opinion was that code exemption did not do much to reduce the falling hazard and that guards and railings should be provided regardless.
Look closely at stair and guard rail balusters for loose, split, broken, or damaged balusters. Someone tried an over-sized common nail to "repair" this loose baluster at its connection to the stair tread.
The result is a dangerous child hazard as this baluster could easily be pushed out of place.
Balusters for Guards & Railings
Stairway handrail & stair balusters & guard details are in this sketch.
Balusters (vertical posts comprising the barrier in guards and railings)
Baluster opening between vertical members (maximum sphere passage <= 4 3/8")
Baluster opening in triangular area below guard bottom rail and stair tread (maximum sphere passage <= 6")
Hand-railing heights are given:
U.S. handrails for stairs with one side against a wall: 30-38"
U.S. handrails at open stairs: 34-38" above the stairs
Canadian stair handrails: 32-36" above the stairs
Wall clearance: Handrails along a wall must have at least 1.5" of clearance between the inside surface of the rail and the wall surface.
Railings should not project into the required width of the stairway by more than 4.5" at or below the handrail height above the stairs.
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Thanks to Alan Carson and Bob Dunlop, Carson Dunlop, Associates, Toronto, for permission to use illustrations from their publication, The Illustrated Home which illustrates construction details and building components. Carson Dunlop provides home inspection education, publications, report writing materials, and home inspection services. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Our recommended books about building design, inspection, and repair, and about indoor environment testing, diagnosis, and cleanup are at the InspectAPedia Bookstore.
"The Elimination of Unsafe Guardrails, a Progress Report," Elliott O. Stephenson, Building Standards, March-April 1993
"Are Functional Handrails Within Our Grasp" Jake Pauls, Building Standards, January-February 1991
Slips, Trips, Missteps and Their Consequences, Second Edition, Gary M. Bakken, H. Harvey Cohen,A. S. Hyde, Jon R. Abele, ISBN-13: 978-1-933264-01-1 or
ISBN 10: 1-933264-01-2,
available from the publisher, Lawyers ^ Judges Publishing Company,Inc., www.lawyersandjudges.com sales@lawyersandjudges.com and also from the InspectAPedia Bookstore (Amazon.com)
The Stairway Manufacturers' Association, (877) 500-5759, provides a pictorial guide to the stair and railing portion of the International Residential Code.
The following stair books and other books on stair history, design, and architecture can be purchased at our Amazon-Supported InspectAPedia Bookstore
Steps and Stairways, Cleo Baldon & Ib Melchior, Rizzoli, 1989.
The Staircase: History and Theories, John Templar, MIT Press 1995
The Staircase (two volumes), John Templar, Cambridge: the MIT Press, 1992.
"The Dimensions of Stairs", J. M. Fitch et al., Scientific American, October 1974.
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