i need your help guys!!---please one of my customers has a very bad yard . and that because it has a lot of roots from trees . like every body knows if you cut the roots the tree it will die. now question is - can i cover it with lots of top soil and then seed it??? some tree experts told me that tree rots suck all the water from the Grass... i am just confused, should i remove the roots or try to cover them. any advise it will be appreciate!!!