I plan on building a 2-story ICF house with a basement in Michigan. There will be a front porch that takes up the whole front face of the house and sticks out around 5 feet. In addition there will be a roof overhang over the whole porch that will be supported by the porch. I was thinking the porch would be wood construction with a concrete stem wall to support it. The idea behind using a concrete stem wall is so that a stone facade could be put on the side of it. My question is how the footings for this stem wall would look. Can I just go down 42 inches or would they need to be the same depth as the basement footings? If they only need to go down 42 inches, can the footings and the stem wall be poured right up next to the ICF wall of the house? I’m assuming the wood framing of the porch could be supported on the one end by a ledger board bolted to the exterior of the house. I have a similar question for a sunroom I have planned that does not have a basement underneath it. The whole house is on a relatively flat grade and the basement footings would go down around 8.5 feet.
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