Trees are typically considered practical and enjoyable additions for the positive effects they have, which may include improved aesthetics, reduced energy use for heating and cooling and environmental benefits. Trees growing near a house or other structures, however, may pose a threat to foundations and other structural elements. Although the best root damage prevention method is to plant only vegetation that is unlikely to produce intrusive roots and to leave adequate space around the slab, this can be difficult to observe if the tree is already established and prized in the landscape. Steps can be taken to discourage roots from growing under the slab.
Discourage root growth near the slab. Do not water or fertilize the area of the landscape between the tree and the slab and make sure that water drains away from the slab quickly. If an awning or roof-line extends well beyond the slab, it may be keeping the soil around and under the slab dry enough to discourage tree roots.