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Trees & Sidewalks Program

In front of one-, two-, and three-family homes only (Tax Class 1), Parks’ sidewalk repair program can help repair severe sidewalk damage caused by tree and root growth. Funding to this program is limited, and repairs are made based on the severity of damage. Parks can assist you and your contractor if you wish to repair the sidewalk yourself by requesting a free Root and Sidewalk Consultation.

How to Sign up

Call 311 or use our tree service request system to request enrollment of a site in the Trees & Sidewalks program.

Notices of Violation

If you have already received a Notice of Violation (NOV) from the Department of Transportation (DOT), the extent of the sidewalk repair required to lift your Notice of Violation may be beyond the scope of the program. If you would like to hire a contractor and perform the work yourself, please request a free Sidewalk Consultation for design recommendations from Parks.

Understanding your Evaluation

Once we receive a Trees & Sidewalk request, a Parks Department Forester will inspect the site. Inspectors qualify and quantify the damage to the sidewalk at each site by rating the site according to a number of criteria. These criteria include vertical lift, number of damaged flagstones, the volume of pedestrian usage, passable sidewalk width, and the condition of the tree. Your sidewalk will be inspected and evaluated on a scale up to 100 based on the following criteria:

Location

The location’s usage is determined by the volume of pedestrian traffic. Highly trafficked areas will be scored higher than areas with less use.

Clearance

Clearance is determined by how much of the sidewalk is impacted by the damage. Narrow sidewalks will be scored higher than wide ones, where the damage can be more easily avoided.

Damage and Vertical Lift

Vertical lift elevates the level of sidewalk joints. Sidewalks that are cracked but not raised will rate lower than those that are lifted and present a greater tripping hazard. For example, lifts less than 1/2 inch will rate lower than lifts of more than two inches.

Tree condition

Tree condition is evaluated to determine the potential benefit of a sidewalk repair based on tree longevity.

Number of Damaged Flags

The number of sidewalk flagstones damaged by tree roots will be taken into consideration, with higher scores going to sites having multiple damaged flags.

Repair Timeframe

Repairs will be made according to the sidewalk priority rating. We repair the sidewalks with the highest priority ratings first. Homeowners who have time-sensitive needs for sidewalk repair may wish to fix their sidewalks themselves by requesting a Sidewalk Design Consultation and obtaining a free permit from Parks to work around the roots.

Before and after pictures of sidewalk repairs

Repair Methods

We will employ a variety of design strategies and construction techniques to repair sidewalks around trees. Each solution will seek to optimize the pedestrian experience while minimizing damage to tree roots. Repair strategies include:

Tree Pit Expansion

This technique involves the removal of damaged concrete sidewalk from the area around the tree and expansion of the size of the tree pit around the tree. This practice also increases the level of permeable surfacing reducing the stormwater runoff.

Ramping

The grade of the sidewalk is gradually raised to bridge large roots while assuring a smooth, even sidewalk surface.

Strengthening

The sidewalk is reinforced with steel or fiberglass plastic rebar or wire mesh to reduce uneven joint lift due to tree roots as well as the likelihood of random cracking in the future.

Curving

A curving pathway around tree roots increasing the room for trees and providing a unique aesthetic value. This design approach is particularly advantageous in some cases as root pruning/slicing is prohibited.

Reducing condensation

A layer of coarse gravel is installed under the new sidewalk to help reduce the build-up of condensation which in turn reduces shallow rooting.

All excavations and concrete removals within the area of the tree are performed with extreme care. We employ best-of-class tree protection methods including hand and/or pneumatic excavation, exposed root protection, and minimizing soil exposure time.

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