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We have a 12 foot high retaining wall that makes a semi circle off the back of our house (walk out basement). we built the wall so that we can access a sitting area from the first floor and this Spring I am planning to build a deck on the area enclosed by the wall. Since the fill in this area (has settled for 3 years) is 12 foot deep and likely will still continue to settle for years, digging footings does not make sense.... My current plan is to buy the square deck blocks that accept standard 2 x 10's (etc.) and run these from a header attached to house.
1) has anyone ever built a deck on top of a retaining wall ?.
2) What are some techniques for the foottings that were used ?.
3) Should the header be attached to the house permenantly ( lag screws ) or just enough to fix the deck from moving away to allow freeze thaw in winter ?.
In Chicago and looking for some advice - thanks
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