Help! I’m refurbishing a Washington house that is already put together. Everything but the roof is attached. But the house foundation isn’t level and the house rocks back and forth. I scraped off the old siding. But I feel like the house should be level before I do anything else to it. Has anyone run into this problem before? I measured the walls of the foundation. They’re all 5 cm long. I don’t really know what the problem is. Can anyone offer some advice on how to fix it?