How To Add Stone to a Wooden Deck – stonegal53
Stone should not be laid over any wood than is questionable. It is better to replace it, than to have structural issue down the road. To re-enforce the deck, double up the 2″x12″ joists and depending on the load the deck will bear a better re-enforcement would be to double the 2″x12″ joist and add joist so they are 8 inches on center, rather than 16 inches on center.