I live in southern Indiana in a rural area. I have a huge (60 -70') American Elm tree growing between my house and a barn. We've been here for 7 years, and we've noticed that the huge roots of this tree are more visible now. They seem to have come up to the surface and make mowing a little difficult. This is within 5 - 10 feet of the trunk. My questions are: I want to add a garage to my home. The closest edge would be about 20' from the tree trunk. Do you think this would be okay? I don't want to damage the tree, especially since it hangs over my house. That far out, do you think the roots would damage the concrete floor of the garage? And, what should I do about the large roots that are surfacing? Should I just mulch around the tree, plant some perennials or shrubs?