Double twist netting

Double-twist netting is the basis of any protection against rockfalls.

It is used:

• on cliffs (hanging or fitted netting),
• to line rockfall protection screens (installed on the uphill side, it blocks the passage of smaller stones),
• as a barrier (netted screen in the case of very low energy values),
• as a deflector screen for small stones.
  

The major characteristics of double-twist is that it prevents the meshes from coming apart if a wire snaps.

AVAROC markets AFNOR-approved DT netting, which comes with:

• different wire diameters: 2.4 – 2.7 and 3 mm
• with different types of corrosion protection:
  EN 10244-2 class "A" reinforced galvanisation.
  Galfan coating (alloy comprising 95% zinc, 5% aluminium and traces of misch metal); the working life is thus multiplied by 3 in comparison with rich galvanisation,
  PVC coasting on class "A" galvanised wire
• different mesh sizes:
  60 x 80 mm - 80 x 100 mm - 100 X 120 mm

The normal dimensions for rolls are 4 m wide and 50 m long.