Module 3 — Stand level components
of biodiversity
British Columbia
Ministry of Forests
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Module 3, Part G — Related topics — continued
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No-work zones (NWZ)

 

The purpose of a no-work zone is to protect workers from tree hazards in situations where the danger tree or parts thereof have not been removed 

NWZs are generally 1.5 times the height of the danger tree length. This length can be modified (larger or smaller) depending on site-specific conditions

When the decision has been made to retain a valuable wildlife tree that has been assessed as dangerous to workers, a no-work zone must be clearly identified and marked on site. The no-work zone must include all the area on the ground that could be reached by any dislodged portion of the tree.

No-work zones will take into account the nature of the hazard and the lean of the tree.

On steep ground, the no-work zone will be extended downhill to protect workers.

No-work zones can be adjusted in size depending on the size of surrounding live timber (e.g., a small tree surrounded by much larger trees that shield the adjacent area have a NWZ radius less than 1.5 defect lengths.

A kickback area should be included for semicircular no-work zones. The size and shape of this area is determined by tree lean, condition, and form (branching).

See the Wildlife/Danger Tree Assessor's Course (No-Work Zones (NWZ) for detailed information.

     
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