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Shoring & Jacking: Part II Jacking and shoring an old building is a job unlike anything in new construction. When you frame a new floor or roof deck, you know your spans and material dimensions, and how to nail it all together so it stays together. But when you need to jack up a 50-plus-year old building to repair its disintegrating underbelly, there are few known quantities. Every jacking and shoring job is a tricky custom job, and a dangerous one. In fact, every time I get under a jackedup building, I hear the refrain from that Jimmy Dean song about getting buried in a mine because some shoring came loose. . . So, here are some guidelines about jacking