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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
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.
slide4

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.
slide5

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.)
slide6

Below Ground

  • Trenching beyond CRZ only.
  • Tunnel under roots within CRZ.
  • Assure “clean cuts” of large, severed roots.
  • Keep exposed roots moist until covered.
slide7

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
slide9

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)
slide10

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.
slide11

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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