Dominique Browning provides tips:
As a rule, in this day and age, large trees shouldn’t be hanging over a house, unless you don’t mind living dangerously. Trees near a house are okay, so long as they have lots of space for their roots. But all too often we’re squeezing trees into lousy spaces, especially trees on the strips next to sidewalks in cities and towns alike, or the trees growing out of rocky outcroppings, whose roots are compromised.
What usually makes these trees vulnerable is poor drainage. The ground gets very wet, water doesn’t drain properly because there’s nowhere for it to go, and then the trees lose their footing, so to speak. Up and over they go. Tree roots are surprisingly shallow. If you go look closely at an overturned tree, you’ll be amazed at how little root system there is for such a big creature. Especially if the roots have been constricted by substructure concrete for roadbeds. Trees need to spread their roots to be more stable.
(A car crushed by a tree following Hurricane Sandy on October 30, 2012 in the Financial District of New York, United States. By Andrew Burton/Getty Images)