Trees are seldom more vulnerable to injury and soil compaction than during construction. The effects of these impacts are often fatal—sometimes rapidly and sometimes slowly, unfolding over the course of subsequent years. An ounce of prevention, in this case, is worth well more than a pound of cure.

The most effective time to implement tree protection is before construction begins. Too often, this is not the case, and an arborist—contacted well into the process—is forced to perform damage control. Regardless, Tree Protection Zones (TPZs) are vital to preserving these resources, and are often required by city code.

The primary function of a TPZ is to protect the tree’s trunk and root system. Roots are easily overlooked by those unfamiliar with their sensitivity and function; however, constant traffic (vehicles, heavy equipment, even human feet!) can compact soils and effectively suffocate these tissues. Soil on a construction site can become as dense as solid quartz—great for buildings, but not for fibrous roots which live in topsoil, having, on average, the thickness of human hair.

Metal fencing will be erected around a designated radius from the trunk, and various measures may be implemented to prepare the tree for impacts that occur outside this zone. It is critical that this barrier is not moved or altered in any way during construction—unless under the supervision of the project arborist. Depending on project duration, periodic site monitoring will be performed, to ensure TPZ compliance.

I look forward to assisting with this process, and educating crews on how they can protect these resources while avoiding costly violations.