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Retaining Wall Construction Building A Timber Retaining Wall. Developed by: Dr. Teri Hamlin Georgia Department of Education. Timber Retaining Wall. To level a steep slope Enclose an area for a decorative garden Elevate Beds. Which wood?.

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retaining wall construction building a timber retaining wall

Retaining Wall ConstructionBuilding A Timber Retaining Wall

Developed by:

Dr. Teri Hamlin

Georgia Department of Education

timber retaining wall
Timber Retaining Wall
  • To level a steep slope
  • Enclose an area for a decorative garden
  • Elevate Beds
which wood
Which wood?
  • Treated pine and hardwoods are good choices for a timber retaining wall.
  • Avoid old railway timbers as these are treated with creosote, which harms some plants and heavy to work with.
  • Also need reinforcing rods secure the structure.
steps
Steps:
  • Cut a beveled trench into the slope, wet the trench and tamp it well.
steps1
Steps
  • Set the first timber in place and level it.
  • This course will be completely buried in the ground.
steps2
Steps
  • The timbers are installed in a pattern similar to a brick wall with the butt ends of timbers in one course offset from those in the courses above and below.
steps3
Steps
  • Set a second timber on top of the first and bore a hole through the two timbers.
  • Use a heavy-duty drill with an extension bit.
    • A small bit burns out on long holes such as these.
  • Drive a reinforcing rod through the holes into the ground to hold the timbers firmly together.
steps4
Steps
  • In addition to the 15 degrees inward slope of the wall, vertical stability is achieved by installing tiebacks.
  • These are single timbers inserted perpendicularly from the face of the wall into the soil backfill to a distance equal to their height above the base of the wall.
steps5
Steps
  • Continue to lay the timbers
    • staggering the joints from one course to the next
  • Drill holes and use a reinforcing rod to pin each timber to the one below on each side of every joint.
  • Cut timbers with a sharp chain saw, and wear goggles to protect your eyes from flying chips.
steps6
Steps
  • Backfill where necessary.
  • For drainage,
    • Drill weep holes along the wall\'s length
    • Drill a row of holes above the ground
steps7
Steps
  • Fill the cavity.
  • You can top off the terraces with plantings or mulch.
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