Installation for KoirWrap 1000 and 1200
The sequence below describes fabric-encapsulated soil construction. Use it with the project drawings: lift dimensions, embedment, stake spacing, backfill and toe protection must follow the site-specific design.
- Prepare the foundation. Clean, grade and compact the base of the slope or streambank. Position a stabilizer board on the outside face of the base lift and secure it with wood stakes or rebar pins. Lift heights typically range from 9 to 18 inches and must be determined by the project engineer. Include toe protection where specified (Figure 1).
- Lay out and anchor the wrap. Unroll KoirWrap parallel to the streambank or slope face with the jute layer facing upward. Drape it over the stabilizer board to form a 90° angle at the soil surface. The illustrated detail shows a minimum 3-foot embedment. Anchor the fabric and place the specified backfill mixture (Figure 2).
- Compact, wrap and plant the base lift. Compact the backfill to the specified density. Seed the portion of the lift that will be exposed, draw the fabric tightly over the soil and secure it in the key trench. Spread a 2- to 3-inch soil layer over the wrapped lift and place live, self-rooting cuttings as specified (Figure 3).
- Build successive lifts. Repeat the wrapping and compaction sequence using the specified backfill. Set each lift back according to the drawings; the general detail illustrates offsets of 3 to 36 inches (Figure 4).
- Finish and establish vegetation. Add topsoil, seed and any specified soil amendments to the upper lift. Protect the surface with the specified KoirMat or erosion control blanket. Install seedlings or plant plugs through the wrap along the horizontal benches as shown in the planting plan (Figure 5).
Illustrated construction sequence
These general illustrations show the construction stages. Use the project drawings for installation dimensions and anchor spacing.
Figure 1 — Prepared and compacted foundation with stabilizer board
Figure 2 — Fabric placement, anchoring and base-lift backfill
Figure 3 — Wrapped base lift with live cuttings
Figure 4 — Successive lifts with designed setbacks
Figure 5 — Finished slope with vegetation and surface protection
Alternative layered construction
Where the project specification permits, KoirMat 700 or 900 may be combined with C400 or KoirPad 640 as an alternative layered arrangement. Place the KoirMat first, followed by the inner layer, and draw both layers tightly around the soil. Confirm any substitution with the project designer.
KoirWrap technical comparison
Typical values from Nedia’s product specification sheets. MD and TD refer to the machine and transverse directions. Use the complete specification sheet and project requirements when selecting a fabric.
KoirWrap 1000 and KoirWrap 1200
| Property |
Test method |
KoirWrap 1000 |
KoirWrap 1200 |
| Standard roll width |
— |
4 m |
4 m |
| Construction |
— |
Woven coir with jute lining |
Woven coir with jute lining |
| Thickness |
ASTM D5199 |
0.35 in (0.90 cm) |
0.35 in (0.90 cm) |
| Mass per unit area |
ASTM D5261 |
33.3 oz/yd² (1,130 g/m²) |
38.5 oz/yd² (1,305 g/m²) |
| Primary-layer tensile strength (MD × TD) |
ASTM D4595 |
1,008 × 936 lb/ft |
1,968 × 1,416 lb/ft |
| Secondary-layer tensile strength (MD × TD) |
ASTM D4595 |
612 × 468 lb/ft |
612 × 468 lb/ft |
| Secondary-layer puncture strength |
GRI GS1 |
553 lb (2,461 N) |
553 lb (2,461 N) |
| Water absorption |
ASTM D1117 |
146% |
146% |
| Permittivity |
ASTM D4491 |
3.07 s⁻¹ |
3.07 s⁻¹ |
| Permeability |
ASTM D4491 |
1.03 in/s (2.61 cm/s) |
1.03 in/s (2.61 cm/s) |
Download specification sheets
Standard roll width is 4 m. Confirm roll lengths and current supply details with Nedia before ordering.
