How much to space deck floor boards: This article explains proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.
Average Deck Size. A small deck intended to hold a round dining table should be at least 12 feet by 12 feet, while a large deck can be designed with much more space. The average deck size is between 300 and 400 square feet. Generally, a deck should be wider than it is deep, with the longer dimension running along the house.
If you’re unsure whether a board is too wet, compare its weight with that of an untreated board the same size; if it’s twice as heavy and feels damp, it may need time to dry. You can “sticker” the wood and let it dry for a few weeks (see photo). For decking boards, look for wood that’s labeled KDAT (kiln dried after treatment).
Some added thickness can help with any cupping in the boards but for a typical residential deck I don’t see the need to exceed a 5/4 (full 1″) board. In really dry climates and areas with a lot of direct sun we will recommend a 5/4 x4 or 6 deck board for the most stability.
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