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Install Deck Boards and Trim Joists — Install Decking

Intermediate4 mins

Part of project

Deck Construction · Step 9 of 13

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Install the deck boards over the joist framework. These deck boards were wet when installed, so they were placed tightly together. As the wood dries, it will naturally shrink, creating a quarter-inch gap between boards. This gap is ideal for water runoff and proper drainage. Use appropriate exterior-grade deck screws to fasten the deck boards to the joists. Ensure to use two screws per joist for each board. To create a clean, finished edge, leave the joists long during initial installation. Once all deck boards are screwed down, dry-fit the last two deck boards and mark the ends of the joists, subtracting 1 1/2 inches (the thickness of the rim joist). Then, cut all the joists to this marked length using a circular saw, ensuring the final deck board and rim joist will sit perfectly flush.

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FAQs

How difficult is building a deck, and how much time should I realistically expect it to take?

Building a deck is an intermediate to advanced DIY project that requires careful planning and precision. While individual tasks vary, a complete deck build can easily take several weekends or even weeks, depending on the size, complexity, and your experience level. Don't underestimate the time needed for planning, permits, and inspections.

Why are permits and local building codes so important for deck construction?

Permits ensure your deck meets safety standards and local building regulations, preventing potential fines and ensuring structural integrity. Local codes dictate crucial aspects like footing depth, span lengths for beams and joists, fastener types, and railing height. Always check with your local municipality before starting any work to avoid costly rework or safety hazards.

What specialized tools will I need beyond basic hand tools for building a deck?

Beyond common tools like a measuring tape, pencil, and level, you'll need specialized equipment such as a post hole digger for footings and a power saw for cutting lumber accurately. A decking tool, like the Plank Rite Decking Tool mentioned, can be very helpful for consistent board spacing. Consider renting larger tools for efficiency.

What are some common mistakes beginners make that compromise deck safety and longevity?

A major mistake is neglecting proper footing depth and size, which can lead to settling and instability. Another common error is improperly attaching the ledger board to the house or failing to use appropriate fasteners, which can cause catastrophic structural failure. Always ensure all connections meet local code requirements and are securely fastened to carry the intended load.