Construction damage prevention
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Construction Damage & Prevention. Presented by: Courtney Blevins, Fort Worth Region. Construction damage is one of the greatest causes of tree death and decline in urban areas. Damage & Effects. Roots. Key to everything! Extend 2 - 3 times tree height from base.

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Construction Damage & Prevention

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Construction damage prevention

Construction Damage & Prevention

Presented by: Courtney Blevins, Fort Worth Region

Construction damage is one of the greatest causes of tree death and decline in urban areas.


Damage effects

Damage & Effects

Roots

  • Key to everything!

  • Extend 2 - 3 times tree height from base.

  • Shallow - 95% in top 3’ of soil; 90% in top 1”

  • Root volume reduced with reduction of soil pore space.

  • Reduced root volume equals branch dieback in following years.


Construction damage prevention

Root Spread


Construction damage prevention

Soil Compaction

  • Effected by soil type or texture.

  • Loss of pore space = loss of oxygen = loss of roots = loss of branches or tree.

  • Results from any equipment or foot traffic.

  • Protect Critical Root Zone (CRZ) with fencing, mulch, water, etc.


Construction damage prevention

Above Ground

  • Protect trunks

  • Assure adequate height clearance for branches (use an arborist)

  • No storage, parking, etc. within CRZ.

  • Avoid cut/fill within CRZ

  • Avoid damaging conditions from grade changes (excess water, etc.)


Construction damage prevention

Below Ground

  • Trenching beyond CRZ only.

  • Tunnel under roots within CRZ.

  • Assure “clean cuts” of large, severed roots.

  • Keep exposed roots moist until covered.


Construction damage prevention

Grade Changes

  • 2” - 4” of fill kills roots.

  • Fine “feeder” roots are near the soil surface.

  • Any “cut” removes roots.

  • Drainage patterns change.

  • Use retaining walls if unavoidable.


Prevention

Prevention

Plan Before You Build

  • Tree map.

  • - Species, Size, Location, Health?

  • Site plan.

  • - Structures

  • - Utilities

  • - Roads

  • - Grading


Construction damage prevention

ID Trees to be Preserved

  • Use a professional “tree person”.

  • Trees to remove include:

  • - Those that can’t be planned around.

  • - Undesirable species.

  • - Those unlikely to survive the construction process. (These may be the larger trees on site)


Construction damage prevention

ID Trees to be Preserved, cont.

  • Modify site plan to accommodate trees to be preserved.

  • - Written construction specs are needed including:

  • + Protection fences for CRZ

  • + Travel lanes beyond CRZ

  • + Parking areas beyond CRZ

  • + Storage areas beyond CRZ

  • + Grade changes beyond CRZ

  • - Supervised by “tree pro” on site.


Construction damage prevention

Post Construction Activities

  • Re-asses condition of trees.

  • Determine maintenance needs.

  • - Automatic sprinkling systems?

  • - Pruning damaged limbs (arborist).

  • - Mulch, mulch, mulch; aka NO GRASS

  • - Extra water?

  • - Fertilization?


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