Pre Construction Tree Protection Plan

Protecting Trees During Construction

Many people do not realize that construction, excavation and heavy machinery wreak havoc on the root systems of trees which can either stunt growth or kill the tree.

The damage that occurs during construction may not at first be obvious unless the tree’s trunk was damaged. In most cases the tree appears healthy but produces little new growth.

Stress symptoms caused by tree root damage may take 5 to 10 years to fully develop. The tree initially lives off of its stored reserves — after the tree reserves are depleted and the tree is exposed to hot, dry weather the tree declines rapidly and eventually may die. Often insects and disease will invade the weakened tree and accelerate this process.

Most active tree roots are in the top 3 feet of soil; the majority is in the top 12 inches. Roots normally grow outward to about three times the branch spread. Only 50 percent of the trees root system occurs between the trunk and the drip line. The drip edge is the outer most vertical plane of the trees leaves.

If possible, heavy machine operation should be avoided under a tree canopies drip edge.  [see photo]

Digging trenches for installation of water, sewer, telephone, cable, gas lines, or for building foundations can damage the root system of nearby trees.  The percentage of the total root system affected, the overall health of the tree, time of year, and the type and age of the tree will influence the survival and recovery rate of the tree.

To minimize potential damage, attempt to locate trenching in areas that will cause the fewest roots to be damaged or near areas that have already been trenched. If possible, designate one general area for trenching.
Taking proper precautions to your landscape treasures during a construction project or renovation can and will pay dividends.

Pre Construction Tree Protection Plan Consderations:

1. Surround the trees with snow fencing. The snow fencing, if possible, should extend in a circle around the trees drip edge. This area should be “off limits”.

2. Placing a barrier around the trunk of the tree does not protect most of the tree’s root system. But maybe necessary if machinery has to maneuver close to the tree. Install wood 2×4 slats to protect the bark from being cut.

3. Avoid storing piles of dirt or materials under the tree

4. After construction moderate application of fertilizer may be beneficial. Use 2 pounds of 5-10-5 per inch of trunk diameter measured three feet above the ground.

5. Damage from filling – The base of a tree at the soil line should flare out (be wider than the tree trunk a foot above the soil line). If the tree does not have a flare, but enters the ground in a straight line, fill dirt has been added

6. Changes in soil grade – Even a few inches of fill or soil removal can cause extensive root damage. If possible, never remove soil from or add large amounts of soil within the drip line.

7. If a tree well is to be constructed, built a wall no closer than the drip line and grade the soil outside of the tree well so it drains away from the tree.

8. Locate trenching in areas that will cause the fewest roots to be damaged.

Concord Carpenter

Who is Concord Carpenter?    ~ Robert Robillard is editor of A Concord Carpenter and principal of a carpentry and renovation business located in Concord, Massachusetts. Rob is a recognized leader in tool and how-to information for building professionals, he also hosts the Concord Carpenter Cable TV Show, offering the do-it-yourself audience in Boston's Meto West region expert advice on home repairs and maintenance. On his website, Rob covers all aspects of home improvement and remodeling, specializing in problem solving for home maintenance. Rob enjoys evaluating and reviewing tools and products and restoring vintage tools. The Concord Carpenter's motto: "Well done is better than well said!":

More Posts - Website