Area of Application

The ISOSTOP systems are generally characterized by a slim design. This makes transport and installation in high alpine terrain much easier. They are an effective and efficient system used to protect life, infrastructure and other elements at risk. ISOSTOP 1:1 scale tested carrying both European and Swiss certifications.

Rope Guidances

The upper and lower bearing ropes are led through a rope guidance that is integrated on each post head and base plate. Each guidance provides large curved surfaces to help protect the ropes and allow unobstructed movement. The guidance is designed to be robust and with no movable parts in order to ensure longevity and zero maintenance.

Integrated Ladder

Post are constructed from a conventional profile-section. Each post has an integrated ladder composed of rungs spaced at 50 cm intervals in the webbing of the I-beam. The ladder assists in the installation of the fence as well as routine inspection and maintenance.

Base Plate

The universal base plates of the ISOSTOP systems can be used for compression-tension anchoring, as well as for placement on foundations or walls. The unique mounting bolt enables free-standing installation of the posts, which saves significant time, especially when assembling a helicopter.

Lateral Anchorage

The lateral anchoring of the ISOSTOP systems is clearly structured and can be reduced to a minimum of anchors by use of efficient brake elements. This shortens the construction time and reduces construction costs.

Retaining Rope Anchorage

ISOSTOP systems do not have brake elements on the upslope side of the fence and are therefore particularly insensitive to surface loads such as static snow loads, avalanches or landslides. Due to the optimal interaction of the nets, ropes, posts and brake elements, the forces in the retaining ropes are small and enable a small number of anchors and reduced anchor lengths.

Simplex Brake Element

Friction-based brake elements, such as the SIMPLEX brake, have a long history of proven use and impresses with its simplicity during transport, installation and maintenance.
ModelISOSTOP 1000 Ec
StyleHinged System
Energy Class3
Maximum Energy Level Certified/Tested [kJ]1000 / 1016
(369 / 375)
Service Energy Level Certified/Tested [kJ]330
Approved Heights - ETA [m (ft)]4.0 - 5.0
(13.1 - 16.4)
VerificationFull Scale Tested
Certification - ETAETAG27 / EAD 340059-00-0106 certified
Test Report Summary
Test Height [m (ft)]4.0
Maximum Elongation [m (ft)]7.45
Residual Height ClassA (≥50%)
Component FailureNone
Primary Net Opening [m (ft)]2.92
Secondary Mesh50/50/2.5
European Technical Assessment ETA
ETA NumberETA-22/0890
Issuing BodyTSUS Building Testing and Research Institute
Date of IssueJanuary 17, 2023
Certificate of Conformity
Report Number1301-CPR-2138
Issuing BodyTSUS Building Testing and Research Institute
Date of IssueMarch 3, 2023
Primary Net
ModelDiagonal Wire Rope Net
TypeSteel Wire Cable with Clamps
Rope Diameter [mm (inch)]9.0
Rope Construction6 x 7 SC
Corrosion ProtectionZn or ZnAl (Class A or B)
Mesh Size [mm (inch)]250 x 250
(9.84 x 9.84)
Unit Weight [kg/m2 (lb/ft2)]3.0
Mesh Tensile Strength calculated [kN/m (lbf/ft)] n/a
Connection to Main Ropes5/8" Shackle
Connection to Adjacent Panel5/16" Shackle
Diagonal Wire Rope Net

This Diagonal Wire Rope Net is particularly insensitive to surface loads due to its stable structure and diagonal load distribution. The individually pressed cable connections ensure that the load is absorbed across the surface even if the net is damaged and offer great protection.

Bearing Ropes
Quantity per fence segment4
Rope Diameter [mm (inch)]18
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per rope1
Brake Element ModelDual Simplex BE-18-1000/3000
Middle Ropes
Quantity per fence segment-
Rope Diameter [mm (inch)]-
Corrosion Protection-
Brake Elements per rope-
Brake Element Model-
Retaining Ropes
Quantity per fence segment2
Rope Diameter [mm (inch)]16
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per ropen/a
Brake Element Modeln/a
Support Structure
Post TypeHEA 120
Integrated Laddern/a
Rope GuidesIntegrated
Post Weight as tested [kg (lbs)]86
Base Plate ConnectionTongue and Pin
Base Plate Foot Print [mm (in.)]480 x 300
(19 x 12)
Base Plate Weight [kg (lbs)]19
Anchors per base plate2 / 4
Post Base Support
1.Post; 2.Rope Guide; 3.Base Plate; 4.Hinge Pin; 5.Anchor; 6.Bolt
Retaining Rope Anchorage
1.Retaining Rope; 2.Anchor Eye; 3.Anchor
Lateral Anchorage
1.Side Stabilization Rope; 2.Upper Bearing Rope; 3.Lower Bearing Rope; 4.Brake Element; 5.Anchor Eye; 6.Anchor
Anchor Forces
Base Plate Tension (Loose Ground) FLGA,ten [kN (kips)] 233
Base Plate Compression (Loose Ground) FLGA,pres [kN (kips)] 165
Base Plate Shear (Rock/Foundation) FMF,shear [kN (kips)] 42
Lateral Anchor Fk,lat [kN (kips)] 295
Retaining Rope Anchor Fk,ret [kN (kips)] 123
Typical Recommended Anchors Based on Steel Grade
Anchor PositionQuantity per 50 m 10 m post spacing500/550 MPa (e.g. GEWI)670/800 MPa (e.g. GEWI Plus)min 470 MPa (e.g. IBO)
Base Plate12 / 242522n/a
Lateral2 / 42522R32-280
Typical Cross Section
1.Post; 2.Rope Guide; 3.Base Plate; 4.Diagonal Wire Rope Net; 5.Retaining Rope; 6.Anchor Eye; 7.Retaining Anchor; 8.Anchor
Typical Layout
1.Post; 2.Upper Bearing Rope; 3.Lower Bearing Rope; 4.Retaining Rope; 5.Side Stabilization Rope; 6. Retaining Anchor; 7.Lateral Anchor