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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. Roots. Key to everything! Extend 2 - 3 times tree height from base.

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Construction Damage & Prevention

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  1. 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.

  2. 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.

  3. Root Spread

  4. 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.

  5. 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.)

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

  7. 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.

  8. Prevention Plan Before You Build • Tree map. • - Species, Size, Location, Health? • Site plan. • - Structures • - Utilities • - Roads • - Grading

  9. 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)

  10. 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.

  11. 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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