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Building Codes Q&A

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This excerpt is from the Frequently Asked Questions page on its website. For more information see www.municipalaffairs.gov.ab.ca

Q: “I am building an uncovered deck at my residence, what are the code requirements for the exterior stairs, handrails and guards?”

The unit rise of the stairs shall not be less than 125 mm nor greater than 200 mm with a maximum tolerance of 6 mm between adjacent treads or landing and 6 mm between the tallest and shortest riser in a flight. Unit rise is measured from top of a tread to top of tread or landing.

The unit run shall not be less than 210 mm nor greater than 355 mm with a maximum tolerance of 6 mm between adjacent treads and 6 mm between the deepest and shallowest runs in a flight. Unit run is measured from face of riser to face of riser.

Treads shall not be less than 235 mm nor greater than 355 mm with a maximum tolerance of 6 mm between adjacent treads and 6 mm between the deepest and shallowest treads in a flight. Treads are measured from the face of the riser to outer edge of the stair nosing. Stair nosing shall not be greater than 25 mm beyond the face of the adjacent riser below.

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