Slope Repair

Slope repair strengthens the slope's resistance to erosion. It corrects slope instability and protects your home and your family from the potentially catastrophic effects of landslides.

If your property is located on the side of a hill or on a steeply sloping site, you may be at risk.

foundation damage due to slope failure

Mother Nature typically tries to reduce the gradient of most slopes — and the steeper the slope, the more prone it is to instability and problems.

If you have a hillside property and it is showing signs of foundation damage due to slope instability, slope repairs must be carried out IMMEDIATELY.

Request a slope inspection.

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  • slope failure unstable slope failure
    Slope failureUnstable slope
  • slope repair slope failure repair
    Slope repair commencesSlope stabilization work
  • slope repair benching french drain installed on slope benches
    Compacting fillDrainage system installed to prevent erosion due to poor drainage
  • slope drainage installation drainage pipe in soil separator fabric
    PVC pipe on soil separator fabric and gravel for drainagePVC pipe for drainage wrapped in soil separator fabric
  • slope repair specialists slope repair stepping or benching
    Slope repair specialists at workA slope step or bench after soil has been compacted
  • slope repair in progress slope repair steps
    Slope stabilization in progressSteps along the would-be stable slope
  • slope repair work slope bench soil compaction
    Slope repair continuesCompacting of soil in slope benches
  • slope repair experts slope repair friction piles
    Sinai Construction Engineering slope repair crew at workFriction piles
  • slope stabilization work slope failure prevention
    View from the top of the slopeReconstructed stabilized slope
  • slope repaired drainage at bottom of repaired slope
    The bottom of the reconstructed slopeGutter at the bottom of the stable slope

Do You Need Slope Repair?

A hillside foundation specialist should be able to tell you for sure if you need to have your slope stabilized. Basically, if you own a hillside property and its foundation or any one of the foundation's components is showing signs of failure — you must seek professional help.

Look out for Signs of Foundation Damage

The following may indicate that one or more components of your foundation are failing. Again, it should be stressed that if your home is located on a steep slope, a failing foundation may be early warning signs of slope instability.

  • Your floors have become out of level.
  • Parts of your home seem to be pulling away or tilting.
  • There are cracks in your foundation, walls and floors.
  • Your doors and/or windows stick or are misaligned.
  • There are gaps around your doors and/or windows.
  • There's apparent soil movement away from the foundation.
  • There's moisture in your basement/crawlspace walls and other signs of water intrusion into your foundation.

Look out for Signs of Slope Instability

The following may indicate a recent slope movement or impending slope failure:

  • Exposed soil shows signs of recent erosion and/or tension cracks parallel to the contours of the land.
  • There are bulges, cracks and water seepage were there were none before.
  • Certain areas in the ground have sunk or dropped.

The following may indicate long-term soil movement — what is known as "downhill creep":

  • The trees in and around your property show signs of leaning or have curved trunks. This can be a sign that they have tried righting themselves during growth.
  • Other fixtures in your property or neighborhood (including utility poles and fences) also show signs of leaning or tilting.

Look out for Potential Triggers of Slope Instability

Even if your property has shown or shows no signs of slope instability, you could be at risk if it has just undergone a deluge from heavy rains or melting winter snow. Heavy rains and melting snow can saturate the soil. This change in the soil's water saturation levels could lead to adjustments in its angle of repose, which could in turn cause landslides.

Even if it doesn't immediately lead to erosion, water saturation of the soil could cause gradual settlement which, if left unchecked, could eventually lead to foundation damage.

Stop putting your family at risk of slope failure.
Contact us to have your unstable slope repaired.

What to Expect in Slope Repair

Sinai Construction Engineering prevents slope instability, strengthens unstable slopes or repairs/restores damaged slopes using the most appropriate techniques given specific site conditions. Our field personnel are trained and qualified; we use the most cost-effective approach to fit our clients' budget requirements, and we employ construction methods that reflect the latest developments in engineering geology and engineering technology. Depending on your property's needs, we may use one or a combination of the following methods:

Friction Piles

Friction piles are usually used as a preventive measure and installed in sites that are susceptible to lateral soil movement. The piles may be isolated and designed as soldier piles or provided with a panel or lagging and designed as a retaining wall. Lagging is placed between the piles as a barrier. This acts as a retaining wall and prevents the soil between the piles from moving downward.

Keying and Benching

This is a necessary step in slope repair. If the slope has already failed and the earth materials are to be replaced as part of the restoration, the compacted, replacement fill must be keyed and benched (stepped) into the underlying competent material.


Geo-grid is a heavy gauge plastic mesh used within layers of the approved compacted fill to strengthen the fill. This is usually used when a gradient slope steeper than the maximum allowable 2:1 (26 degrees) is required. Geo-grid is a cost-effective slope repair solution as retaining walls may be eliminated to create a larger level area.

Retaining Walls

Retaining walls are generally used to increase the size of a level pad area or for subterranean portions of a structure.

Retaining walls less than 4 feet in height with a horizontal back slope are typically allowed within the City of Los Angeles, provided that the standard engineering information provided by the City is used. Walls in excess of 4 feet high will require obtaining a Geologic and Soils Engineering Exploration report, survey, and structural engineering before a permit could be issued.


Shotcrete refers to concrete that is pneumatically applied over a grid of reinforcement bars, which have been properly anchored to the slope. Shotcrete is used to stabilize slopes when the slope face consists of bedrock.

The City now requires a Geologic and Soils Engineering Exploration report, survey, and structural engineering in order to obtain a permit for the use of this construction technique. Shotcrete for slope stabilization is considered to be a remedial repair.


Poor drainage control is the most significant potential problem for hillside sites. Fortunately, it is also the most preventable.

Each site has specific minimum drainage requirements, and statistics show that concentrated drainage typically results in erosion and slope failures. Thus, before building on a slope or before repairing a damaged slope, you should have an engineering geologist inspect the site to evaluate its drainage conditions and provide drainage recommendations.

  • Winner, 2015 Angie's List Super Service Award

    Winner, Angie's List
    Super Service Award 2015

  • Winner, 2014 Angie's List Super Service Award

    Winner, Angie's List
    Super Service Award 2014

  • Winner, 2013 Angie's List Super Service Award

    Winner, Angie's List
    Super Service Award 2013

  • Winner, 2012 Angie's List Super Service Award

    Winner, Angie's List
    Super Service Award 2012

  • Winner, 2011 Angie's List Super Service Award

    Winner, Angie's List
    Super Service Award 2011

  • Member, International Concrete Repair Institute

    Member, Int'l Concrete Repair Institute

  • Home Advisor Screened and Approved

    Screened and Approved by Home Advisor

  • Talk of the Town Award winner for Customer Satisfaction

    Winner, Customer Satisfaction Award
    2014, 2012, 2011

"Our home was being destroyed inch by inch because of slope failure. To be honest, I thought the damage was beyond repair but Sinai Construction proved me wrong. They presented me with a project plan that is both affordable and more importantly effective in providing a permanent solution to the problem. Two months and extensive concrete reinforcement later, I can say that our home is even more stable now that it was when brand new!"

Ellen G., Mount Washington

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