Portland's hillside neighborhoods need retaining walls that withstand both heavy winter saturation and seismic activity. Our engineered systems exceed Oregon's special construction requirements for slopes over 10% grade.
We use interlocking concrete blocks with geogrid reinforcement, spacing drainage weep holes every 4 feet to prevent hydrostatic pressure buildup. For natural stone walls, we install helical tiebacks anchored 6 feet into stable subsoil. All designs include expansion joints and flexible connectors that allow movement without collapse.
Particularly crucial for homes near the Portland Hills Fault, our walls incorporate seismic gap gravel backfill that absorbs shaking energy. We coordinate with geotechnical engineers when working within 200 feet of known landslide areas.
We use interlocking concrete blocks with geogrid reinforcement, spacing drainage weep holes every 4 feet to prevent hydrostatic pressure buildup. For natural stone walls, we install helical tiebacks anchored 6 feet into stable subsoil. All designs include expansion joints and flexible connectors that allow movement without collapse.
Particularly crucial for homes near the Portland Hills Fault, our walls incorporate seismic gap gravel backfill that absorbs shaking energy. We coordinate with geotechnical engineers when working within 200 feet of known landslide areas.
Our Process
- 01 Step 1: Site survey with inclinometer readings
- 02 Step 2: Core sampling to determine bedrock depth
- 03 Step 3: Reinforced footing installation
- 04 Step 4: Staggered construction with movement monitoring
Benefits
- Meets Portland Bureau of Development Services seismic codes
- Drainage systems prevent winter wall failures
- Materials chosen to complement Pacific Northwest aesthetics
- 10-year warranty on structural integrity
Frequently Asked Questions
How do these compare to standard landscape walls?
Our walls cost 15-20% more initially but require no costly seismic retrofits later—a common issue with older Portland installations.
Can you repair existing failing walls?
We stabilize about 30 walls annually in Portland's west hills, often adding tiebacks and drainage without full reconstruction.