Should I use brown or green pressure-treated lumber for my deck project in Coquitlam?

The BC Building Code requires a landing after a maximum of 18 risers (steps) in any single flight of stairs. This applies to all residential deck stairs and is a critical safety requirement that prevents excessively long, potentially dangerous staircases.

For deck construction in Metro Vancouver, this means any staircase with more than 18 steps must include an intermediate landing that's at least as wide as the staircase and a minimum of 860mm (approximately 34 inches) deep. The landing effectively breaks the staircase into two separate flights, providing a rest point and reducing the risk of serious injury from a fall down a long flight of stairs.

Practical implications for Metro Vancouver deck projects: Most residential deck stairs fall well below this 18-step threshold. A typical deck that's 8-10 feet above grade requires only 10-14 steps with standard 7-inch risers. However, this becomes relevant for elevated decks on steep lots — common in North Vancouver, West Vancouver, Burnaby's hillside neighborhoods, and parts of Coquitlam and Port Moody where decks may be 15-20 feet above the yard level.

Additional stair code requirements that affect deck construction include maximum riser height of 200mm (7.87 inches), minimum tread depth of 210mm (8.27 inches), and consistent riser heights within each flight (maximum 6mm variation). Handrails are required on any staircase with more than 3 risers and must be 865-965mm (34-38 inches) above the stair nosing.

When planning elevated deck stairs on sloped Metro Vancouver properties, consider switchback designs or L-shaped configurations with landings rather than a single straight flight. This approach not only meets code requirements but also reduces the visual impact of a long staircase, provides more comfortable access, and often works better with landscaping. For complex elevated deck projects requiring long staircases, consult with an experienced deck contractor who understands BC Building Code requirements and can design stairs that are both code-compliant and practical for your specific site conditions.

Building permits are required for any deck over 600mm above grade, and the stair design must be included in the permit drawings. Municipal building departments will review stair dimensions, landing requirements, and handrail specifications as part of the permit approval process.

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