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I have done it twice. That is - added a second floor on a 1 story house. The foundation and first floor walls are not the problem The problem is the weather. Plan properly. Move quickly. Plan for a bit of rain with lots of tarps. And just do it. Unless your foundation was poorly placed that will not be a problem. 2 x 4 walls on the first floor are the same as you find on a 2 story house most places.
AND NO YOU DON"T LIFT THE HOUSE to add a floor!!!
You don't need to listen to Rube Goldberg, you just need a contractor that knows his engineering and codes.
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2001 911 Cabriolet
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