What Was Wrong
A steep Wahroonga block had soil movement and water pressure affecting the lower garden and nearby structures, so the retained area needed a stronger wall and drainage.
Wahroonga Timber Retaining Wall
Retaining Walls project in Wahroonga
Service: Retaining WallsLocation: Wahroonga
Service
Retaining Walls
Suburb
Wahroonga
Work completed
Excavate into the slope, Build a reinforced timber retaining wall, Install ag pipe drainage
Materials
Treated timber sleepers, Retaining posts, Ag pipe
Main jobs
Wall rebuild, drainage behind the wall, retained soil, and tidy finishing
Photos
6 site photos including 5 before or progress views
This Wahroonga block sits on a steep slope and had serious erosion issues. Soil was moving downhill and water had no clear path off the site, putting pressure on the lower sections of the garden and the structures near the boundary.
We excavated into the slope, built a reinforced timber retaining wall, and installed a drainage system behind it with ag pipe to carry water away from the retained area. The wall holds the ground in place and the drainage stops water from building up behind the timbers, which is what causes most retaining wall failures over time.
What We Did
The problem we found, the work completed, and how the job turned out.
What We Had To Allow For
The slope required careful excavation and staged wall construction Water had to be redirected behind the wall The wall needed to hold the garden while fitting the steep site
How We Did It
Excavate into the slope, Build a reinforced timber retaining wall, Install ag pipe drainage, Place drainage aggregate and backfill, Finish and clean the retained area. Excavate the slope enough to form the wall line safely Build the timber retaining wall in sections Install ag pipe and drainage material behind the wall Backfill and finish the retained area so water pressure was controlled
How It Turned Out
The retained slope is now supported by a timber wall with drainage behind it, reducing the risk of water pressure building against the structure. The drainage outlets and retained soil should be checked after heavy rain to confirm water is moving away from the wall.
Project Photos
See the job from the starting point through to the finished result.
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