Front Porch Fix-up

Prime all the boards' edges and lower faces with fast-drying, oil-based primer to protect them from moisture. Squeeze a bead of polyurethane construction adhesive on all the exposed joists, then place the groove of a replacement board over the tongue of an old deck board and press the new piece into the adhesive. Toenail (pound at an angle) a stainless-steel ring-shark siding nail through the tongue of the new board and into each joist. Recess the nailheads with a nailset and hammer. Continue installing the new decking until you're ready to put in the last piece.