Tree dripline
The dripline is the guide measurement used to prevent unnecessary damage to trees during construction works. It is defined as the outermost circumference of the tree’s canopy, from which water drips onto the ground. The ‘dripline area’ is taken to include the soil and roots that lie within that circumference.
It is crucial for the stability and health of a tree that the dripline area is ‘off limits’ from any construction activity. It may be necessary to erect a fence around the dripline or, if possible, further out around groups of trees so as to prevent their roots from being damaged by construction plant, or by works such as excavation, soil compaction or consolidation. Fences should remain in place until all construction work is complete, including the final grading and smoothing of the site.
If work inside the dripline is unavoidable, only hand tools should be used. Where possible, tunnels should be excavated beneath the root system as opposed to trenching. Other measures that can be adopted to avoid undue damage include:
- Using porous paving materials such as brick or flagstone rather than concrete or asphalt.
- Not raising the grade of the soil inside the dripline by more than a few inches.
- Not lowering the grade of the soil inside the dripline by more than 2 inches.
- Not piling soil or construction materials inside the dripline, even for a short period of time.
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Gregor Harvie argues that AI is state-sanctioned theft of IP.
Many resources for visitors aswell as new features for members.
Using technology to empower communities
The Community data platform; capturing the DNA of a place and fostering participation, for better design.
Heat pump and wind turbine sound calculations for PDRs
MCS publish updated sound calculation standards for permitted development installations.
Homes England creates largest housing-led site in the North
Successful, 34 hectare land acquisition with the residential allocation now completed.
Scottish apprenticeship training proposals
General support although better accountability and transparency is sought.
The history of building regulations
A story of belated action in response to crisis.
Moisture, fire safety and emerging trends in living walls
How wet is your wall?
Current policy explained and newly published consultation by the UK and Welsh Governments.
British architecture 1919–39. Book review.
Conservation of listed prefabs in Moseley.
Energy industry calls for urgent reform.
Heritage staff wellbeing at work survey.
A five minute introduction.
50th Golden anniversary ECA Edmundson apprentice award
Showcasing the very best electrotechnical and engineering services for half a century.
Welsh government consults on HRBs and reg changes
Seeking feedback on a new regulatory regime and a broad range of issues.
CIOB Client Guide (2nd edition) March 2025
Free download covering statutory dutyholder roles under the Building Safety Act and much more.