![Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot. Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.](https://inspectapedia.com/structure/Deck_Girders151-DJFs.jpg)
Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.
![Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot. Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.](https://inspectapedia.com/decks/Deck-Drainage-Venting-557-DGs.jpg)
Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.
![Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot. Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.](https://inspectapedia.com/decks/Deck-TH-MN-135-DJFs.jpg)
Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.
![Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot. Deck floor board spacing gaps: Proper gap size to leave between deck boards for drainage and drying, and extra steps to take to protect deck joists from rot.](https://inspectapedia.com/decks/Cumaru-Deck-Tiles-Advantagelumber.coms.jpg)