Tree Protection Guidance.pdf

Tree Protection during Demolition of Bld. # 5022

Each tree to be retained shall have a designated Tree Protection Zone identifying the area sufficiently large enough to protect it and its roots from disturbance. The protection fence should be a high density polyethylene fencing with 3.5’’ X 1.5’’ opening; Color is orange. Steel posts (2’’ X 6’ steel posts or approved equal) installed at 8’ o.c. driven into the ground of sufficient depth to hold the fabric solidly in place without sagging. The fabric shall be attached to the post using attachment ties of sufficient number and strength to hold up the fabric without sagging. The Govt. Representative may request, at any time, additional post, deeper post depths and or additional fabric attachments if the fabric begins to sag, lean or otherwise not present a sufficient barrier to access. Temporary tree protection fencing should be erected before activities begin on the site. Effective TPZs maintain a radius of at least 1.25 feet of protected area for each inch of trunk diameter (Table 2).

Table 2. Mature Tree Protection Zone Guidelines

Mature Tree Protection Zone Radius

Trunk

Diameter

Good

Protection

Better

Protection

Best

Protection

8 inches 10 feet 12 feet 20 feet

12 inches 15 feet 18 feet 30 feet

16 inches 20 feet 24 feet 40 feet

20 inches 25 feet 30 feet 50 feet

A) Activities prohibited within the Tree Protection Zone include:

Parking vehicles or equipment, storage of building materials, refuse, or excavated soils, or dumping poisonous material on or around trees and roots. Poisonous materials include, but are not limited to paint, petroleum products, concrete, stucco mix, dirty water or any material that may be harmful to tree health. The use of tree trunks as a backstop, winch support, anchorage, as a temporary power pole, signpost or other similar function.