Our neighbor,of 20+ yrs. has a birch tree next to the fence, next to our walkway, & house. The roots are starting to go into out window-well, lifting the sidewalk, and possible into our foundation. The neighbor doesn't talk to anybody on the block, including us. We are going to cut the root from the window-well and other areas that we can. Do we need to hire an arborist to see if the roots are damaging our foundation, and if that is the case, how would you suggest we tell him about the existing problem. Thank you, Phyllis