Frost Heave on a new deck
I built an 19x16 foot deck last summer. The deck height is about 6 ft with 8 6x6 posts. The footings already existed and passed an inspection from the local city inspector. There are 4 posts along the middle of the deck, and 4 along the outside edge. This winter, I've noticed the middle 4 footings heaved and the outside posts are now about 3-4" off of the footing. I'll be carefully watching them as they settle back this spring, but is there any way to address this without having to redo all 8 footings? The existing footings are 48" down in a clay soil in the Twin Cities, MN.