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My suggestion is to attach the deck to the house. It would be too much weight because its distributed along the entire length of the home. You home sounds like mine, the back of the house slops down hill? The lower decks have not moved 1/2" for the 17 years I built it (finished it before my first kid came so he can play out there). I dug these large footings knowing it will never move. They are 36" x36" up to 3-4 foot deep. I know, nuts even though my hill is on bed rock but the top soil isn't too great.
My suggestion to you is to take care of the slight sag on the corner of the building. Have someone under pin that corner so its more stable. Depending on accessibility, it shouldn't cost too much money to stop the settling.
How long is the deck going out, 6'?
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