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Foam <br />Underlay <br />A foam layer of <br />support <br />between <br />pavement and <br />existing soil or <br />tree roots. <br />Help prevent root <br />damage, offers an <br />alternative to root <br />pruning. <br />Best used to repair <br />damage caused by <br />mature tree roots, <br />not a long-term <br />solution, not <br />recommended for <br />tree species known <br />to have rapid root <br />growth, leads to <br />more work for the <br />City in the future. <br /> <br /> <br /> <br />Conflict Prevention Methods Before Planting <br />Method Description Benefits Considerations Example Image <br />Lowered <br />Tree Sites <br />A cutout in <br />the sidewalk <br />in which a <br />hole is dug <br />several feet <br />deep, typically <br />with metal <br />grates placed <br />over the hole <br />and around <br />the trunk of <br />the tree. <br />Prevents soil <br />compaction <br />with reduced <br />pedestrian <br />traffic, enables <br />installation of a <br />tree at a site <br />with limited <br />planting space. <br />Existence of <br />underground <br />infrastructure, <br />increased <br />maintenance due to <br />accumulation of <br />debris, must include <br />a drainage plan to <br />avoid oversaturation <br />of soil. <br /> <br />Modified <br />Gravel <br />Layer <br />A layer of <br />gravel <br />between <br />pavement <br />and existing <br />soil or tree <br />roots. <br />Suppressed <br />root growth, <br />more longevity <br />than foam <br />underlay, <br />thickness of <br />gravel around <br />roots can be <br />adjusted to <br />accommodate <br />tree size. Cost <br />saving option <br />at installation. <br />Potential to wound <br />tree roots, <br />increasing <br />susceptibility to <br />soilborne <br />pathogens. Will not <br />work for panels that <br />have already been <br />lifted. <br />