Advanced Reinforcement Techniques

Challenging sites require innovative solutions. Slope steepness, height and adjacent site conditions, such as roadways, buildings or waterways can all affect the stability of a slope. Envirolok is designed to be compatible with a variety of construction techniques for added strength and stability. In addition to our patented Cinch and Twine reinforcement, Envirolok can be combined with geogrid reinforcement, earth anchors and rock anchors.  For projects requiring toe protection from moving water, we recommend geogrid armoring or combining the system with hard armoring techniques, such as boulders or rip rap placed to the ordinary high-water level.  See below for more detail.

Envirolok installation on the Sandy River, OR


Cinch & Twine

Envirolok’s patented weaving technique provides additional strength, ideal for applications in unusually conditions such as high energy water flow or wave action. For  Low Impact Development (LID), this technique is truly one of a kind. The cinch and twine method or weaving, allows the Envirolok system to be installed while minimizing soil disturbance, preserving natural and cultural resources and allows existing hydraulic patterns to remain intact.

Cinch & Twine Installation Detail

Cinch & Twine Case Study – Wheaton Sanitary District

Geogrid (Geosynthetic Reinforcement)

<Geogrid is an easy addition for installations over 4′ in height, or where additional shear strength is required.  Simply place the geogrid along the length of the structure, using the spikes to secure the geogrid to the bags.  Secure the geogrid into the slope by placing and compacting backfill over each layer. The first layer of geogrid is typically set back into the slope at a ratio of 75% of the slope height.  Additional layers should be set every 3rd course and are typically shorter in length.

Geogrid Installation Detail

Geogrid Case Study – Lakewood Country Club


Anchors can maximize strength and stability for applications where there is limited ability to disturb the existing soil for excavation and backfill.  Anchors can be drilled into existing parent bedrock or soil and are attached to the Envirolok system by connecting wire anchors to a pipe or coated rebar that runs the length of the slope.  The pipe or rebar is then secured to the bags by wrapping the it in geogrid an connecting the geogrid to the top and bottom of the bag course, using the spikes.

Anchoring Details

Anchoring Case Study – Glenorchy Trail


Boulder Armoring is Added at the Water’s Edge

Geogrid Armoring

Armoring helps protect Envirolok at the toe of the slope from the forces of fast moving water. In addition to protection from the scouring effects of wave action and fast moving water, armoring can prevent shoreline slopes due to carried debris such as ice, logs or small boulders. For lakes and waterways with little wave action, the units can be protected by wrapping the faces with a geotextile guard. For shorelines along larger, more active lakes and rivers, bags should be protected from currents and scouring waves by installing rip rap or boulders to the water line.

Geogrid Armoring Detail

Rip Rap Base Detail