Forestry expert witness Russell E. Carlson, RCA, BCMA, Tree Tech Consulting, writes on Guidelines for Protection of Trees on Construction Sites:
The following guidelines are minimum standards recommended for the preservation of trees. These guidelines should be incorporated in construction contracts, and the details made available to all parties involved with work on the site, including equipment operators. Other guidelines and protective measures may also be appropriate, in addition tho those listed below.
1. Protection Barrier: A protection barrier shall be installed around the tree or trees to be preserved. The barrier shall be constructed of durable fencing material, such as plastic construction fencing, snow fence, or chain-link fencing. The barrier shall be placed as far from the base of the tree(s) as possible, preferably at the drip-line. The fencing shall be maintained in good repair throughout the duration of the project, and shall not be removed, relocated, or encroached upon without permission of the arborist involved.


