It's 8 a.m. and your phone rings. The caller says he has a 90-year-old redwood tree {Sequoia sempervirens) in his backyard that is cracking the concrete slab of his patio and garage floor, and he would like the roots cut.This type of scenario plays itself out on a daily basis across the country. As the arbor-ist inspects the situation, his thoughts lead to questions: "How can I be sure where the roots really are? Which ones are contributing to the damage? How many are there, and how deep are they? Can I install root barrier and not jeopardize tree stability? Should I recommend the tree be removed?"Not having the ability to see beyond the concrete slab makes answers to these questions so difficult, even for the experienced arborist.
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