Wooden decking that has rotted or deteriorated over time will need to be replaced. Start by using a hammer and pry bar to remove the old deck boards. You can also insert a long board between the decking and joists to pry the old deck boards loose.
After all the old decking and nails have been removed, pull a string or extend a straight board on edge across the floor joists to make sure the joists haven’t sagged. Replace or shim up any sagging joists before installing the new decking.
Align the first deck board perpendicular to the floor joists and overhanging the outside edge of the deck. Screw the board in place using 3” long, rust resistant deck screws.
Pressure treated deck boards which have been kiln dried after treatment (KDAT) will expand slightly in width after installation, so use an 8-penny nail as a spacer to leave a 1/8” gap between the boards.
Boards that haven’t been kiln dried after treatment and are still wet with preservative will shrink slightly when they dry, so butt them closely together when attaching.
To straighten a crooked board, attach one end of the board to the deck joists, and then pry the other end into place before securing it.
Leave the deck boards longer than the deck, so they hang over the outer edge of the deck by several inches or more. After all the deck boards have been attached, pop a chalk line an inch or so past the end of the deck foundation and use a circular saw to cut the decking to the finished length.
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