Wire Rope Netting

Wire rope netting is a high-capacity cable-net rockfall system built from interlocking 8 to 12 mm spiral-strand steel wire ropes per ASTM A1023, used for multi-ton boulder containment on slopes where the design block exceeds the working range of woven steel mesh.

Multi-Ton

Block Capacity

ASTM A1023

Wire Rope Standard

75+

Year Service Life

Up to 5,000 kJ

Barrier Cable-Net

Overview

Understanding Wire Rope Netting

Wire rope netting, also called cable netting, is a high-capacity rockfall control system built from prefabricated panels of interlocking 8 to 12 mm diameter spiral-strand steel wire ropes per ASTM A1023, clamped or shackled at every grid intersection. The wire-rope construction provides higher tensile capacity than woven mesh products, which is why cable nets are specified for multi-ton boulder containment on slopes where the design block exceeds the working range of draped mesh (ASTM A975 hexagonal mesh at 30-50 kN/m or high-tensile diamond mesh at up to 150 kN/m).

The dominant US cable-net product family (Geobrugg SPIDER and equivalents) is deployed in three configurations: gravity-tensioned drape from a row of crest anchors, full-face pinned anchorage on a rock-bolt grid for active restraint at the source, and as the interception element in flexible rockfall barrier kits certified to EOTA EAD 340059-00-0106. Cable nets are specified on mining highwalls, dam and hydroelectric infrastructure, and highway and rail corridors with documented multi-ton block release.

What Is Wire Rope Netting?

Wire rope netting is a rockfall protection system in which the catch element is a prefabricated panel of interlocking spiral-strand steel wire ropes rather than a woven steel mesh. The ropes are typically 8 to 12 mm in diameter, manufactured to ASTM A1023, and clamped or shackled at every grid intersection on a uniform pattern (200 to 400 mm openings). The wire-rope construction increases tensile capacity meaningfully over woven mesh, which uses 3 to 4 mm steel wires interlocked in a hexagonal or diamond pattern at 30 to 150 kN/m system capacity. Cable nets are the catch element specified when the design block exceeds the working range of woven mesh, generally above one to two tons, with the upper bound set by anchor capacity rather than the net itself.

The dominant US cable-net product family is Geobrugg SPIDER, deployed in three configurations: top-anchored drape (heavier-duty alternative to draped woven mesh on slopes with multi-ton release blocks), full-face pinned anchorage (active restraint at the source on slopes adjacent to highway, rail, or critical infrastructure, parallel to pinned mesh in concept but rated for larger blocks), and as the interception element in flexible rockfall barrier kits as an alternative to ring nets, certified per EOTA EAD 340059-00-0106 in the moderate-to-high energy class range. Maccaferri Steelgrid HR is a hybrid product that integrates wire-rope cables into a hexagonal mesh body for intermediate block sizes between woven mesh and pure cable net.

Key Benefits

Multi-ton block capacity above the working range of woven mesh
Three deployable configurations: drape, pinned, and barrier interception
Cable matrix retains smaller debris than ring-net systems
Galvanized wire rope provides 75+ year service life with low maintenance
Compatible with helicopter, crane, and rope-access deployment on remote sites

Used In Our Services

Mesh & Barrier Systems

Rock Anchoring

Rope Access

The Engineering

How Wire Rope Netting Works

How the system carries load in service, and how we build it on site.

Construction is anchor-first, panel-second, with anchors sized for the heavier system load. In drape configuration, crews drill a row of crest anchors with larger-diameter threadbar (typically 1.0 to 1.5 in / 25 to 38 mm) embedded 8 to 20 ft into competent rock or soil at 10 to 30 ft on-center, with a tensioned perimeter wire rope threaded through the anchor heads to support the panel. In pinned configuration, the anchor pattern extends across the slope face, typically on a 6 to 10 ft grid of rock bolts or tieback anchors, each terminating in a heavy bearing plate that loads the cable-net intersection points directly. Cable-net panels are pre-fabricated off-site (panel sizes set by the lift capacity of the helicopter or crane on site), staged at the crest, and lifted into position. Rope-access crews then lace adjacent panels with shackles or specialized cross clips at each rope intersection along the seam line.

In service, the load path runs through the cable matrix into the perimeter rope and into the anchors. When a block strikes the net in drape configuration, the impact deforms the local cable matrix elastically, transfers tension into the perimeter rope along all four edges of the panel, and discharges through the perimeter into the crest and lateral edge anchors. The block decelerates as it ricochets between cable net and rock during its descent into the catchment area at the toe. In pinned configuration, the impact energy is absorbed locally between adjacent face anchors and transfers directly into the bolt grid rather than running the full panel length. In barrier configuration, the cable net is the interception element behind the post line: the block deforms the cable matrix, the deformation pulls tension into the support cables, brake elements extend through controlled friction or pipe deformation, and the residual load transfers into the foundations exactly as in a ring-net barrier. The cable-rope construction provides higher stiffness and lower elongation than woven mesh, which is why cable nets are favored where the deflection envelope behind the system is constrained.

Design Analysis

Rockfall trajectory modeling under FHWA RHRS sets cable diameter, grid spacing, and anchor capacity for the design block and impact energy.

Anchor Installation

Heavy crest or face anchors drilled and grouted to design pull-out capacity, sized larger than woven-mesh anchors for the heavier system load.

Panel Lift & Placement

Pre-fabricated cable-net panels lifted into position by helicopter, heavy crane, or telehandler and aligned against the rock face.

Seam Lacing

Adjacent panels laced with shackles or specialized cross clips at each rope intersection along the seam line.

Tensioning & Termination

Perimeter rope tensioned through anchor heads in drape configuration, or face bolts torqued and pull-tested in pinned configuration.

System Variants

Cable Net System Variants

Type 01

Drape Cable Nets

Cable-net drape replaces woven mesh on slopes where the design block exceeds the working range of ASTM A975 hexagonal or high-tensile diamond mesh, typically multi-ton boulders or freeze-thaw release that produces repeated above-one-ton blocks. Construction matches the draped mesh sequence (top anchor row, perimeter rope, gravity-tensioned panels) but with heavier wire ropes (8 to 12 mm versus 3 to 4 mm in woven mesh) and larger crest anchors. The system is deployed on mining highwalls with active multi-ton release, on transportation corridors below cliff faces with documented large-block history, and on post-wildfire slopes where source rate and block size both exceed mesh capacity.

Type 02

Pinned (Anchored) Cable Nets

Pinned cable nets extend the pinned mesh configuration to the multi-ton block range. Rock bolts or tieback anchors penetrate the cable net at every grid intersection or on a 6 to 10 ft pattern, with heavy bearing plates clamping the cable matrix to the rock face. The system actively restrains loose blocks at the source rather than guiding them to a catchment, which is the right specification near roadways, rail, and structures where falling rock cannot be tolerated and where the design block exceeds woven-mesh capacity. Geobrugg SPIDER and equivalent products are the dominant pinned cable-net systems in US practice, often combined with structural shotcrete on heavily fractured zones for a unified facing.

Type 03

Cable-Net Barrier Interception Elements

Cable nets are the interception element in a subset of flexible rockfall barrier kits, an alternative to interlocking ring nets across the post array. The advantage of a cable-net barrier is the smaller mesh opening, which retains smaller debris that would pass through a ring net, useful on sites with mixed block sizes or where the barrier must capture a continuous range from sub-foot blocks up to the rated MEL. Cable-net barriers cover the same EAD 340059-00-0106 energy class framework as ring-net systems, with typical certification through the moderate-to-high energy range up to roughly 5,000 kJ. For higher-energy applications, high-energy ring-net barriers become more cost-effective because progressive ring deformation provides a longer effective brake stroke than a cable matrix.

Side By Side

Cable Net vs Other Rockfall Systems

Cable Net vs Woven Mesh

The fundamental axis is the catch element. Woven mesh products (ASTM A975 hexagonal or high-tensile diamond) are constructed from interlocked steel wires 3 to 4 mm in diameter, supplied at 30 to 150 kN/m system capacity, and rated for blocks up to several tons in the high-tensile diamond product range. Cable nets are constructed from spiral-strand steel wire ropes 8 to 12 mm in diameter per ASTM A1023, clamped or shackled at every grid intersection, and rated for multi-ton blocks above the working range of woven mesh. Cable nets cost meaningfully more per square foot installed (heavier panels, larger anchors, longer rigging time), so the selection is driven by the design block: woven mesh up to its working range, cable net above. On many corridors, draped mesh handles the bulk of the slope and cable-net drape is specified on a sub-section where modeled block size is highest.

Drape vs Pinned Cable Net

Same passive-versus-active axis as the comparison between drape and pinned woven mesh, with the same configuration tradeoffs scaled to multi-ton blocks. Drape cable nets anchor only along the slope crest and gravity-tension against the rock face, accepting that blocks will detach and travel down to a catchment ditch. The system is faster to install per linear foot of crest, requires drilling only along the top, and tolerates ongoing release without progressive damage. Pinned cable nets anchor across the slope face on a 6 to 10 ft bolt grid, holding loose material in place at the source, and are specified where rocks must not move at all, because catchment width near the toe is constrained, because the slope sits directly above an active travel lane, or because the block size is large enough that a runout impact is unacceptable. Many highway rock cuts run a hybrid configuration: drape on the upper slope and pinned on the lower face adjacent to the roadway.

Cable Net Barrier vs Ring-Net Barrier

In flexible rockfall barrier applications, cable nets and ring nets are alternative interception elements behind the post array. Cable nets are built from interlocked wire ropes with a 200 to 400 mm grid opening and absorb impact energy through cable elongation and grid deformation. Ring nets are built from interlocking steel rings (typically 250 to 350 mm ring diameter, 3 to 4 mm wire) that deform progressively at each ring under impact. Cable nets retain smaller blocks because the mesh opening is tighter, which matters on sites with mixed block sizes, and they tend to be specified through the moderate-to-high energy range up to roughly 5,000 kJ. Ring nets dominate at the highest energy classes (high-energy barriers up to 10,000 kJ) where their progressive ring deformation provides a longer effective brake stroke than a cable matrix.

Not sure which system fits? We'll walk through the tradeoffs for your site conditions.

Talk Through Your Options

Where It Fits

Where Wire Rope Netting Fits

Mining highwalls are the largest market for cable-net systems. Active and post-production highwalls produce multi-ton block release at rates above standard mesh capacity, and operators specify cable nets in pinned or drape configuration to permit continued bench-face activity beneath stabilized slopes. Sizing is driven by the operational block-size envelope and the system pairs with rock bolting and ongoing rock scaling to maintain the production face.

Highway and rail corridors with documented multi-ton boulder hazards are the second major application. Where rockfall trajectory modeling under the FHWA Rockfall Hazard Rating System produces a design block above the working range of woven mesh, cable nets replace mesh on the affected slope sub-sections, often as a cable-net drape on the upper face transitioning to a pinned cable-net section near the travel lane.

Dam, spillway, and hydroelectric infrastructure is a recurring third application. Steep canyon walls above operational structures are protected with cable-net drape where the consequence of block release on the structure below is high and where access to the slope face from below is constrained by water or operational equipment.

Post-event emergency response is the fourth common case. After a documented multi-ton rockfall closure on a highway or rail corridor, cable-net drape can be deployed via helicopter within days of mobilization to protect the corridor while permanent stabilization (additional bolting, structural shotcrete, or controlled blasting for source removal) is designed.

Mining and quarry highwalls with multi-ton block release

Highway and rail corridors below documented large-boulder hazards

Dam, spillway, and hydroelectric infrastructure cliff protection

Post-event emergency rockfall response on transportation corridors

Critical infrastructure sites where modeled block size exceeds woven-mesh capacity

Cable-net interception elements in flexible rockfall barrier kits

Benefits

Key Advantages

Multi-Ton Block Capacity

Cable-rope construction handles multi-ton boulders that exceed the working range of ASTM A975 hexagonal or high-tensile diamond mesh, the working bound is set by anchor capacity rather than the net itself.

High Stiffness, Low Elongation

Cable nets deflect less under impact than woven mesh, which is why they are favored where the deflection envelope behind the system is constrained, near roadways, rail tracks, or operational structures.

Galvanized Service Life

ASTM A1023 Class A galvanized wire ropes provide 75+ year design life in typical exposure, with stainless options available for marine or aggressive chemistry environments.

Steep Terrain Capability

Heavy-duty anchoring allows installation on vertical and overhanging faces where lighter mesh systems would be marginal on the multi-ton block design.

Deployment Flexibility

The same cable-net product family is configurable as drape, pinned, or barrier interception, so the system selection is set by site conditions rather than product-class lock-in.

Engineering

Technical Considerations

Soil/Rock Conditions

Drape and pinned configurations require competent rock or soil at anchor depth. Heavier system loads relative to woven mesh require larger anchor diameters and longer embedment. In barrier configuration, foundations follow the same rock-anchor, micropile, or concrete-footing matrix as ring-net barriers.

Groundwater

Cable nets drain freely, no water retention against the slope. Galvanized coating per ASTM A1023 Class A provides long-term corrosion protection in typical exposure. Stainless wire rope is specified for marine or aggressive chemistry environments.

Load Capacity

Drape and pinned system capacity is governed by cable diameter, grid spacing, and anchor strength. Barrier-configuration cable nets are certified by EOTA EAD 340059-00-0106 to specific energy classes. Multi-ton block containment is the working envelope.

Spacing

Crest anchor spacing in drape configuration is typically 10 to 30 ft on-center. Pinned face-bolt grids are typically 6 to 10 ft, with tighter spacing in highly fractured zones or where the design block is large. Barrier post spacing follows the kit specification.

Installation Method

Cable-net panels are pre-fabricated off-site, lifted into position by helicopter, heavy crane, or telehandler depending on access, and laced at panel seams by rope-access crews. Face anchors in pinned configuration are drilled and grouted through cable-net intersections with heavy bearing plates.

Equipment Used

Helicopter, heavy crane, or telehandler for panel deployment
Large-diameter drill rigs for anchor installation
Specialized cable termination and tensioning tools
Rope-access rigging systems
Pull-test equipment for anchor verification

Limitations

Higher installed cost per square foot than woven mesh
Heavy panels require crane or helicopter deployment, hand-feed not feasible above small panel sizes
Anchor capacity is the working bound on system load, larger blocks require larger anchors
Catchment area at the toe is required for drape configuration

Technical Specifications

Wire Rope Diameter

8 mm to 12 mm (5/16" to 1/2")

Mesh Opening

200-400 mm (8-16 in)

Wire Rope Spec

ASTM A1023 Class A Galvanized

Energy Rating (Barrier)

Up to 5,000 kJ

Codes And References

Standards & References

ASTM

ASTM A1023

Stranded Carbon Steel Wire Ropes for General Purposes

Material specification for the spiral-strand steel wire ropes used in cable-net rockfall systems. Defines wire grade, strand construction, lay direction, breaking force testing, and Class A galvanized coating requirements. State DOT special provisions for cable-net rockfall work cite this specification directly.

EOTA

EAD 340059-00-0106

Falling Rock Protection Kits

The European Assessment Document (formerly ETAG 027, 2008) governs full-scale impact certification for flexible rockfall barriers including cable-net interception elements. Defines the Service Energy Level and Maximum Energy Level test thresholds and the nine-class kJ rating system referenced by US state DOTs for kit specifications.

FHWA

FHWA-OR-EG-90-01

Rockfall Hazard Rating System (Pierson, Davis, Van Vickle 1990)

The canonical state DOT framework for prioritizing rockfall mitigation against failure consequence and treatment cost. Cable-net selection is downstream of an RHRS score that identifies multi-ton block hazards above the working range of woven mesh.

TRB

Rockfall: Characterization and Control

Turner & Schuster (eds.), 2012

The Transportation Research Board practitioner reference covering trajectory modeling, source-area mitigation, draped and pinned mesh, cable-net systems, and barrier selection. Cited across DOT design manuals as the comprehensive synthesis of US rockfall practice.

Authoritative Sources

FHWA Geotechnical Engineering ASTM A1023 Geobrugg Slope Stabilization

Combinations

Integration With Other Systems

Rock Bolting

Heavy-duty bolts secure cable-net systems in pinned configuration and reinforce the rock mass behind anchored panels.

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Draped Mesh Systems

Cable-net drape replaces woven mesh on slope sub-sections where the modeled block size or slope length exceeds the working range of ASTM A975 hex or high-tensile diamond mesh.

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Rockfall Barriers

Cable nets serve as the interception element in flexible barrier kits as an alternative to ring nets, and toe-of-slope barriers provide backstop containment for high-energy events that overrun cable-net drape installations.

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Mid-Slope Attenuators

Attenuator panels intercept partway down the slope to reduce impact energy before it reaches the primary cable-net containment system at the toe.

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Tieback Anchors

Tieback anchors provide higher pull-out capacity than rock bolts on pinned cable-net installations where the design block exceeds standard bolt capacity.

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Gallery

Our Work in Action

Expertise

Why Choose Rock Supremacy for Wire Rope Netting

Heavy Panel Rigging

Crane, telehandler, and helicopter rigging coordinated under one project team for cable-net panels above the safe rope-access feed weight.

Rope-Access Crews

SPRAT and IRATA-trained technicians install crest and face anchors and lace cable-net seams on vertical and overhanging faces where vehicle-mounted equipment cannot work.

Block-Sized Design

Cable diameter, grid spacing, and anchor capacity are matched to the design block and modeled impact energy under FHWA RHRS rather than spec'd from a default kit, with the configuration (drape, pinned, or barrier interception) selected on site conditions.

Helicopter Mobilization

We coordinate helicopter lifts for remote sites where crane access is impossible, the deployment method required for cable-net installations on cliff faces and for rapid mobilization on rockfall response work.

Self-Performed Integration

Self-perform crest and face-anchor drilling, cable-net deployment, and tie-in to barriers, attenuators, or shotcrete-stabilized zones with our own crews, no subcontractor handoffs between mesh and rock-anchor scopes.

Case Studies

Our Work

See how we've applied this technique and others to solve real-world geotechnical challenges.

Transportation

Glenwood Canyon, CO|2023

I-70 Corridor Stabilization

Installed 50,000 sq ft of high-tensile mesh and performed extensive scaling after a major weather event.

View Case Study

Transportation

Stanley, ID|2023

Ketchum-Challis Highway Scaling

Large-scale rock scaling and mesh installation along 3 miles of Highway 75 through the Sawtooth Mountains.

View Case Study

Civil

Skagway, AK|2023

Skagway Port Rockfall Protection

Comprehensive rockfall mitigation protecting Alaska's busiest cruise port from an 800-foot active slope, completed in a single winter season before the 2023 tourism season.

View Case Study

View All Work

Questions

Wire Rope Netting FAQ

What is wire rope netting?

Wire rope netting (also called cable netting) is a high-capacity rockfall protection system in which the catch element is a prefabricated panel of interlocking spiral-strand steel wire ropes, typically 8 to 12 mm in diameter per ASTM A1023, clamped or shackled at every grid intersection on a 200 to 400 mm pattern. The wire-rope construction increases tensile capacity over woven mesh, which uses 3 to 4 mm steel wires interlocked in a hexagonal or diamond pattern, so cable nets are specified for multi-ton boulder containment above the working range of mesh products.

What is the difference between wire rope netting and draped mesh?

The catch element. Draped mesh uses woven steel wire (ASTM A975 hexagonal at 30-50 kN/m or high-tensile diamond at up to 150 kN/m) constructed from 3 to 4 mm wires, rated for blocks up to several tons. Wire rope netting uses 8 to 12 mm spiral-strand wire ropes per ASTM A1023, clamped or shackled at intersections, rated for multi-ton blocks above the working range of mesh. Cable nets cost meaningfully more per square foot installed because of heavier panels, larger anchors, and longer rigging time, so the selection is driven by the design block. On many corridors, draped mesh covers the bulk of the slope and cable-net drape is used on a sub-section where modeled block size is highest.

What size rocks can wire rope netting contain?

Cable nets are specified for multi-ton boulder containment, with the upper bound set by anchor capacity rather than the net itself. The wire rope diameter (8 mm for typical drapery, up to 12 mm for the heaviest pinned and barrier applications) and grid spacing (200 to 400 mm) are matched to the design block from rockfall trajectory modeling under the FHWA Rockfall Hazard Rating System. The working envelope runs from the upper limit of high-tensile diamond mesh (roughly one to two tons) into the multi-ton range that no woven product can accommodate.

Drape vs pinned cable net configuration: which one do I need?

Same passive-versus-active axis as draped mesh versus pinned mesh. Drape cable nets anchor only along the slope crest, gravity-tension against the rock face, and accept that blocks will detach and travel down to a catchment ditch at the toe. They install faster, drill less, and tolerate ongoing release. Pinned cable nets anchor across the slope face on a 6 to 10 ft bolt grid, holding loose material in place at the source, and are specified where rocks must not move at all (above an active travel lane, where catchment width is constrained, or where a runout impact is unacceptable). Many highway rock cuts run a hybrid: drape on the upper slope, pinned on the lower face adjacent to the roadway.

How is wire rope netting installed on steep slopes?

Cable-net panels are pre-fabricated off-site, sized to the lift capacity of the helicopter or crane on site, and staged at the crest or at a deployable platform. Heavy panels are lifted into position by helicopter for remote sites, by heavy crane where access roads exist, or by telehandler on smaller jobs. Rope-access crews then lace adjacent panels with shackles or specialized cross clips at each rope intersection along the seam, terminate the perimeter rope into crest and lateral anchors in drape configuration, or torque face bolts to design load in pinned configuration. Anchor pull-tests are run before panel deployment to verify design capacity.

How does wire rope netting work in barrier applications?

In flexible rockfall barrier kits, cable nets are an alternative interception element to interlocking ring nets across the post array. Cable nets retain smaller debris than ring nets because the mesh opening is tighter (200 to 400 mm versus 350 mm typical ring net), which matters on sites with mixed block sizes. Cable-net barriers are certified under EOTA EAD 340059-00-0106 to the same nine-class kJ rating system as ring-net systems, with typical certification through the moderate-to-high energy range up to about 5,000 kJ. Above that energy class, ring nets dominate because progressive ring deformation provides a longer effective brake stroke.

What standards govern wire rope netting design?

Three references control US practice. ASTM A1023 (Stranded Carbon Steel Wire Ropes for General Purposes) is the material specification for the wire rope itself, defining strand construction, breaking force, and Class A galvanized coating. EOTA EAD 340059-00-0106 (formerly ETAG 027) is the certification standard for cable-net interception elements in flexible rockfall barrier kits. FHWA-OR-EG-90-01 (the Rockfall Hazard Rating System, Pierson, Davis, and Van Vickle, 1990) is the upstream tool that prioritizes which slopes get cable-net protection and identifies the multi-ton block hazards that drive the selection. The Transportation Research Board's Rockfall: Characterization and Control (Turner and Schuster, eds., 2012) is the comprehensive practitioner synthesis.

How long does wire rope netting last?

ASTM A1023 Class A galvanized wire ropes provide 75+ year design life in typical highway, rail, and mining exposure conditions. Stainless wire rope is specified for marine or aggressive chemistry environments where galvanized coating life is shortened. Service life depends on the corrosion environment, the frequency of impact loading, and the maintenance program. Galvanized cable nets installed in dry continental climates routinely exceed the design life with periodic inspection only.

What maintenance does wire rope netting require?

Periodic inspection of crest and face anchors, perimeter cable tension, panel-seam lacing, and accumulated debris in the catchment area is the standard maintenance program, typically annual in mining and highway service. Catchment ditch cleanout is required after major release events to restore catchment capacity. Brake elements and damaged sections of cable net are replaced after a barrier-configuration impact, with posts, support cables, and foundations remaining in service. The cable matrix itself rarely requires replacement within the 75+ year galvanized service life.

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Methods

Related Techniques

Explore other engineering methods we use to deliver comprehensive geotechnical solutions.

Draped Mesh Systems

Draped mesh is a passive rockfall control system that hangs steel mesh from a single row of crest anchors and uses gravity tension to capture detached blocks and channel them into a catchment area at the slope toe.

Learn More

High-Energy Rockfall Barriers

High-energy rockfall barriers are flexible ring-net catch systems rated above 3,000 kJ for sites where large blocks, tall fall heights, or long-runout slopes drive impact energies beyond the capacity of standard barriers. These kits use heavier posts, longer brake-element strokes, and engineered foundations to dissipate impacts up to 10,000 kJ.

Learn More

Mid-Slope Attenuators

Mid-slope attenuators are hybrid rockfall protection kits installed partway down a slope. The panel decelerates a falling block through controlled brake-element activation, then either releases it into a downstream catchment or contains it in place.

Learn More

Pinned Mesh Systems

Pinned mesh is the active, source-control configuration of a slope mesh system. Steel wire mesh is laid against the rock or soil face and locked at every nail or bolt intersection on a 6 to 13 ft grid, restraining loose material at the source rather than catching it after release into a toe catchment.

Learn More

View All Techniques