A potential customer has asked me to repair their 6 month old mahogany tung and groove porch deck. The previous contractor nailed the 5/4 decking to treated subframing. The mahogany ran perpendicular to to house. A piece of the 5/4 with the tunge ripped off was butted up to the cut edges of the decking and formed a bread board type edge around the deck that was mitered at the corners. Now the entire deck has swelled opening up all the corners as much as 3 inches and a piece of 1x mahogany that bands the porch also has 3″ gaps at its joints. Does the proper repair require that a tenon be created on ends of the decking allowing it to slide in a rabbitted 5/4 edging that runs the perimeter. The deck had been sealed on the surface only with numerous coats of poly just after it was installed. I assume its underside is still absorbing moisture/humidity.
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Can you biscuit those joints where you mentioned putting a tenon?
Either way, I think you know that whatever you do as a repair, you now own that whole deck and all its deficiencies. I'd consider dismantling and rebuilding but of course they probably don't want to pay for that...