Soil Wrap Fabric

KoirWrap™ 1000

KoirWrap™ 1200

Fabric wrapped soil construction is one of the most resilient bioengineering techniques to stabilize streambanks. This technique relies on the strongest type of coir fabric construction to reinforce soil lifts, high density plantings of rows of willow cuttings, native seeds, and in many cases a reinforced stone toe to protect against toe scour. Like all bioengineered designs using degradable fabric, the concept is to rely on fabrics during the initial (three to six years) soil stabilization period. As the fabric degrades, the installed vegetation provides the necessary erosion protection and aesthetic benefits. KoirWrap1000 & KoirWrap 1200 are excellent fabrics for this type of bank treatment.

KoirWrap 1000 & KoirWrap 1200 is a double-layered biodegradable erosion control fabric made up of an outer layer of high strength continuously woven coir matting and an inner layer of lightweight jute fabric connected together at regular intervals. KoirWrap 1000 & KoirWrap 1200 is ideal for fabric wrapped soil construction on steep slopes and along streambanks.

Typical Applications

  • Slopes and streambank stabilization
  • Landscaping and bioengineering
  • Revegetation of construction damaged slopes
  • Trapping sediment and to encourage deposition
  • Reduction of pollution from storm-water run-off

Advantages

  • An excellent product for fabric wrapped soil construction
  • Outer layer of woven coir fabric provides strength
  • Inner layer of woven jute fabric retains fines during period of plant establishment
  • Easy to handle and install
  • Cost effective and long lasting
  • Ideal for steep slopes and high velocity channels

INSTALLATION GUIDELINES FOR FABRIC ENCAPSULATED SOIL CONSTRUCTION USING KoirWrap 1000

 

Clean and grade the base of the slope or stream banks to create a level and compact soil surface. Place a stabilizer board (3/4” plywood cut to the lift height) vertically on the outside face of the base lift. Lift height usually varies from 9” to 18” depending upon desired slope, soil type, flow velocity, etc. and must be determined by the engineer. Secure the stabilizer board using 2” x 2” wood stakes or #4 rebar pins. In case of a stream banks, KoirLogs can be used along the toe of the banks for additional stability (Fig 1)

Unroll KoirWrap parallel to the stream banks or face of the slope as the case may be. Ensure that the secondary layer (jute fabric) is on top. Drape KoirWrap over the stabilizer board so that it forms a 900 angle where the inner face of the stabilizer board meets the soil surface. Keep a minimum embedment length of 3’ as shown in Fig.2. Anchor KoirWrap using 2” x 4” wedge stakes at 3’ spacing along the stabilizer board and along the edge of KoirWrap. Backfill with a well graded mixture of rock and soil (Fig 2).

Compact soil to the required degree of compaction specified by the engineer. Spread native seeds on the portion of the lift that will be exposed to sunlight. Stretch KoirWrap over the compacted soil and extend towards the slope. Anchor KoirWrap using wedge stakes at 3’ spacing in a key trench. This base lift forms the foundation for the upper lifts and provides adequate stability to the slope. Spread 2” to 3” layer of the soil on the top surface of KoirWrap and place live self-rooting cuttings (Fig 3).

Repeat the same procedure for the upper lifts. Native soil without rock can be used as backfill for upper lifts. Offset each lift 3” to 36” from the previous lift as specified on the plans (Fig 4).

On the topmost lift, spread topsoil, seed and fertilizer. Cover the topsoil with KoirMat or an erosion control blanket as appropriate. Container seedlings or plant plugs can be inserted through the KoirWrap along the horizontal benches (Fig 5).

A combination of KoirMat 700 (or KoirMat 900) and C400 (or KoirPad 640) can be used in place of KoirWrap 1000. In such cases the KoirMat layer should be laid down first followed by the layer of C400 or KoirPad 640. When wrapping the soil, both layers are to be drawn together as tightly as possible around the soil.

Technical Specifications:

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