National baseline
The NBC specifies minimum guard heights, load requirements, and opening size limits. Glass guards must use safety glass meeting CAN/CGSB 12.1 and the structural requirements of the guard provisions.
Canadian building code question
What are the building code requirements for balcony guards and glass railings in Canada?
Balcony guards must meet minimum height requirements, resist specified horizontal and vertical loads, limit opening sizes to prevent child passage, and use safety glass types that meet CAN/CGSB standards when glass panels are part of the guard assembly.
Balcony guard failures and glass railing breakage are serious safety concerns that have driven code updates in recent years. The requirements cover guard height, structural load resistance, opening size limits, and glass specifications. Glass guards have additional requirements for the glass type, thickness, and edge treatment to prevent spontaneous breakage and ensure the guard remains effective if a panel breaks.
What to check first
- Confirm the minimum guard height for the application: typically 1070 mm for most locations and 1500 mm for guards required to resist crowd loading or specific high-rise conditions.
- Verify the structural load requirements including horizontal, vertical, and concentrated loads that the guard and its connections must resist.
- Check glass type requirements for glass guards, including tempered, laminated, or tempered-laminated glass as required by the code and referenced glass standards.
Jurisdiction notes
Provincial updates
Some provinces have added requirements for glass guard specifications in response to incidents, including requirements for heat-soaked tempered glass or laminated glass in certain applications.
High-rise considerations
High-rise residential buildings may have additional guard height, glass type, or wind load requirements depending on the building height and provincial amendments.
Work through it in this order
- Determine the required guard height for the balcony location and application.
- Calculate the horizontal, vertical, and concentrated loads the guard must resist based on the occupancy and location.
- Specify the glass type, thickness, and edge treatment for glass panel guards based on the code and referenced CAN/CGSB standards.
- Verify that guard openings do not exceed the maximum size that would allow a 100 mm sphere to pass through.
Common questions
What is the minimum height for a balcony guard?
The standard minimum is 1070 mm for most residential and commercial applications. Higher guards may be required for specific conditions including high-rise balconies or assembly occupancies.
Can I use tempered glass for a balcony guard?
Tempered glass is commonly used, but the code may require laminated or tempered-laminated glass depending on the guard configuration and height above grade. Check the applicable code and glass standards.
What loads must a balcony guard resist?
The NBC specifies horizontal loads (typically 0.75 to 1.5 kN/m depending on occupancy), vertical loads, and concentrated point loads. The guard, connections, and supporting structure must all resist these loads.