Recently, I spent a week in Toronto doing “Lunch and Learns” at architectural firms. I’ve been doing this for years in the U.S. – primarily on the building codes as they apply to handrail and guards. However, the International Building Codes don’t apply to our northern neighbors which meant I needed to learn about the differences. Here’s what I learned.
Here’s what I learned.
In the U.S., while the various code bodies got together in 1999 to create the International Code Council (ICC), it is still important to determine if your application will be governed by the I-Codes – International Building Code (IBC) and International Residential Code (IRC) – or do you have to follow the restrictions of the National Fire Protection Association (NFPA) or the Occupational Safety and Health Administration (OSHA). In Canada, everything governing construction is covered in the National Building Code (NBC).
In Canada, everything governing construction is covered in the National Building Code (NBC).
The NBC is assembled by Canada’s National Research Council. It is published on a five-year cycle with the most recent published in 2015. As with the I-Codes, the NBC is considered minimum standard for safety and a “model code”. Local jurisdictions do not have the human resources to write their own code so what they do is adopt
As with the I-Codes, the NBC is considered a minimum standard for safety and a “model code”. Local jurisdictions do not have the human resources to write their own code so what they do is adopt code. In Canada, provinces will build their code using the NBC as the model – deleting or adding sections as they see fit for their jurisdictions.
In Canada, provinces will create their code using the NBC as the model – deleting or adding sections as they see fit for their jurisdictions.
Since the NBC doesn’t apply until adopted by the local jurisdiction, the more current version is not necessarily in effect in each province.
As in the U.S., this reinforces the need to check with the local jurisdiction when designing any construction project.
In Canada, the codes are “prescriptive” – often with wording that is open to interpretation by the local inspector.
A handrail is required to provide guidance and support.
The number of handrails required is based on the following table:
|Location of Stair or Ramp||
Handrail Serving Stairs
|Handrails Serving Ramps|
|Stairs <1100mm (43”) Wide||Stairs ≥ 1100mm (43”) Wide||Ramps < 1100 mm (43”) Wide||
Ramps ≥ 1100 mm (43”) Wide
Straight or Curved
Number of Sides Required to Have a Handrail
|Within a dwelling unit or a house with a secondary suite||
|All other locations||
Handrails must be continuously “graspable” — it is expected that the user does not have to release the handrail to continue on the next flight of stairs.
For stairs ≥ 2200mm (87 inches), an intermediate handrail is required which is positioned such that a user is no more than 825mm (32 inches) from a handrail.
A handrail is to be placed between 865mm and 1070mm (34 and 42 inches) above the nosing. In the U.S., the I-Codes require handrail to be placed between 34 and 38 inches. The benefit of the National Building Code is that — in commercial applications — it would permit the top of a guard (minimum 42-inch height) to also serve as a handrail once you exceed a 24-inch drop on the stairs. In the U.S., once a stair has a 30-inch drop, a guard with a 42-inch minimum height would be required in addition to a handrail located between 34 and 38 inches.
In the National Building Code, handrails must be “graspable”. In keeping with the prescriptive nature of the NBC, it is somewhat vague as to what that means — Graspable portion of a handrail should allow a person to comfortably grab hold by allowing their fingers and thumb to curl under part of the handrail . . . Or have a recess that is sufficiently wide and deep to accommodate a person’s fingers.
It’s important to note, that in keeping with the need to confirm with local jurisdictions, Ontario does have specific requirements regarding handrail size.
Handrail Bracket Clearance
The National Building Code requires a 2-inch minimum clearance between the wall and handrail. If the wall surface is considered “rough”, that clearance should be 2-3/8 inch.
In the NBC, handrails must be terminated in a manner that will not obstruct pedestrian travel or create a hazard. . . One approach to reducing potential hazards is returning the handrail to a wall, floor or post.
While the NBC leaves room for interpretation, Ontario has very specific requirements regarding extensions which are more in keeping with those in the U.S. Confirm with your local jurisdiction.
Guards are in place to prevent accidental falls. Generally not required unless there is a 600mm (24-inch) drop (The I-Codes require guards once there is a 30-inch drop). Minimum Height of 1070mm (42-inch) in commercial applications and 900mm (36-inch) in residential applications.
Minimum Height of 1070mm (42-inch) in commercial applications and 900mm (36-inch) in residential applications.
Guards have an opening limitation 100mm (3-7/8-inch).
Unlike the I-Codes, the National Building Code does have climbability restrictions for guards.
The 2015 National Building Code does note, however, that climbability restrictions are required for levels above 4.2 meters (13′-9″) above the adjacent level. This is a change from the 2010 NBC which required climbability restrictions on all guards. Confirm with your local jurisdiction as at the time of this writing, Ontario had not yet adopted the 2015 NBC and still requires climbability restrictions on all guards.
Climbability restrictions do not apply for guards in industrial applications where children are not expected to be present.
Acceptable Design Examples
The following are design examples which the NBC has determined to be non-climbable.
Protrusions that are greater than 450mm (18”) apart horizontally and vertically are considered sufficiently far apart to reduce the likelihood of climbing.
Protrusions that present a horizontal offset of 15mm (1/2-inch) or less are considered to not provide a sufficient foot purchase to facilitate climbing.
Designs incorporating spaces that are not more than 45mm (1-3/4”) wide and 200mm (3/4”) high is considered not to facilitate climbing.
Protrusions that present more than a 2-in-1 slope on the offset are considered to not facilitate climbing.
Load Requirements for Guards
|Location of Guard||Minimum Specified Loads|
|Horizontal Load Applied Inward or Outward at any Point at the Minimum Required Height of the Guard||Horizontal Load Applied Outward on Elements Within the Guard, Including Solid Panels and Balusters||Evenly distributed Vertical Load Applied at the Top of the Guard|
|Guards within dwelling units and exterior guards serving not more than 2 dwelling units.||0.5 kN/m (34 lb/ft) OR concentrated load of 1.0 Kn (225 lbs) applied at any point||0.5 kN (112 lbs) applied over a maximum width of 300mm (12”) and a height of 300 mm (12”).||1.5 kN/m (103 lb/ft)|
|Guards serving access ways to equipment platforms and similar areas where the gathering of many people is improbable.||Concentrated load of 1.0 kN (225 lbs) applied at any point.||Concentrated load of 0.5 kN (112 lbs) over an area of 100mm by 100mm (3-7/8” by 3-7/8”) located at any point on the element or elements so as to produce the most critical effect.|
|All other guards||0.75 kN/M (51 lb/ft) OR concentrated load of 1.0 kN (225 lbs) applied at any point.|
Load Requirements for Handrail
- Handrail and their supports shall be designed and constructed to withstand the following loads which are not to be considered to act simultaneously:
- a concentrated load of not less than 0.9 kN (202 lbs)
- or a uniform load of 0.7 kN/m (48 lb/ft)