To really extend the service life of the wood, the science I have read says the key is to keep the underside of the deck well-ventilated and as dry as possible so that the top of the deck board the face side and the bottom of the deck board dry at as similar a rate as possible.
Following are some techniques you can use to give an old deck a new lease on life, or to help maintain the look of a new one. For this project, we enlisted George Graf, a lead carpenter with Mobile's Lipford Construction, and John Starling, owner of John the Painter.
The result is that end-to-end deck boards share the 1-1/2-in. thickness of each joist. That can cause problems, especially with wood decks. With only 3/4 in. of nailing surface, fasteners will cause ends to split, and since the board ends have to be tight, untreated wood will rot.
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