On 22 yr old maple trees, several large roots extend above the ground and grass is not growing. A landscaper wants to put down 2" of topsoil and fescue sod, then use a power roller to pack the soil because it is on a slight slope where water runs off from the back yard. I have heard that the roots should not be covered with soil since they need to breathe and that this could damage the tree in the long term. Also, told by others that compacting soil is even more of a problem. I prefer to grow grass here rather than ground cover, but don't want to damage the trees. Would the topsoil and sod likely cause problems? Also, would this only be a temporary solution until the roots resurface again?