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After reading some of the solutions, it appears that I must not understand the magnitude of what you're doing. I envisioned a low (or no pitched) structure, perhaps 8 to 10 feet wide running the full length of the house. I build custom residential homes for a living and there is a world of difference between the foundation needed for an open framed structure and a structure that may have to carry not only the additional load of a roof, but a potential load of a snowfall. What is also important is to know the span of the rafters and the plan of how the house end of them are being supported. Obviously codes vary from area to area but in our area at least, the inspection office is assuming less and less responsibility and expecting an engineering stamp to be on many simple reno's that 15 years ago would never have warranted one. There are a number of ways to do what you proposing, some are very expensive and some rather cheap. In the foundation area it's easy to throw more concrete at a project, but is it really doing anything if the actual load, frost level and ground conditions don't warrant it? Cheers
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