Should I use 5/4 or 2x6 cedar deck boards for a residential deck in Metro Vancouver?

For residential decks in Metro Vancouver, 5/4 cedar decking (1.25" thick) is the standard choice and will perform excellently for typical residential loads, while 2x6 cedar boards (1.5" thick) are overkill for most applications and significantly more expensive.

5/4 cedar decking is specifically milled for residential deck surfaces and provides the optimal balance of performance, cost, and appearance for Metro Vancouver's climate. At 1.25 inches thick, 5/4 boards are structurally adequate for standard 16-inch joist spacing and typical residential loads (people, furniture, planters, barbecues). The boards are lighter and easier to handle during installation, accept stain more evenly due to consistent milling, and cost approximately 20-30% less than 2x6 lumber. Most importantly, 5/4 decking is kiln-dried to lower moisture content, which means less shrinkage, warping, and checking as the boards acclimate to Vancouver's humid marine climate.

Metro Vancouver's persistent moisture makes board stability crucial. 5/4 decking boards are specifically dried and milled for decking applications, resulting in more predictable performance than dimensional lumber like 2x6s, which are primarily intended for framing. In our climate with 1,200mm+ annual rainfall and 60-80% humidity, any cedar will move as it absorbs and releases moisture seasonally. However, 5/4 boards start with lower moisture content and more stable grain orientation, minimizing the cupping, twisting, and gap formation that can occur with thicker dimensional lumber.

When 2x6 cedar makes sense: Consider 2x6 boards only for heavy-duty applications like commercial decks, decks supporting hot tubs or heavy planters, or when you're spacing joists at 24 inches on center (though 16-inch spacing is strongly recommended in Vancouver's climate for better moisture management). Some homeowners choose 2x6 for the more substantial appearance, but the extra thickness doesn't provide meaningful performance benefits for typical residential use and costs significantly more.

Installation considerations for Vancouver: Regardless of thickness, pre-drill all fastener holes within 2 inches of board ends to prevent splitting, use stainless steel or hot-dipped galvanized screws (never zinc-plated in our climate), and leave 1/8-inch gaps between boards for drainage and seasonal expansion. Install boards crown-side up and apply a high-quality penetrating stain or oil within 60 days of installation to protect against moisture, UV, and mould growth.

Cost difference: 5/4 cedar decking typically runs $8-15 per square foot for materials, while 2x6 cedar costs $12-20 per square foot. For a 300 sq ft deck, choosing 2x6 over 5/4 adds $1,200-1,500 in material costs alone with no meaningful performance benefit for residential use.

Need help finding a deck builder experienced with cedar installation in Metro Vancouver's climate? Vancouver Deck Contractors can match you with local professionals who understand proper fastening, spacing, and finishing techniques for long-lasting cedar decks.

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