This is ok unless the deck is also moving up and down with frost and something sitting above grade will move up and down in the north.I would be at least attaching this to the house in some manner. What I would do and have done in the past is drill through the joist of the deck next to the house and go through the rim joist Of the house. Get some three-quarter inch all thread and bought this deck to the house at about every 6 to 8 feet
He will think he’s hearing shotguns in the middle of the night.