Impasse II Anti-Scale High Security Steel Fence

Prevent intruders from climbing over your perimeter

Impasse II anti-climb perimeter security fence

Deter & Delay

Ameristar's Impasse II anti-scale fencing will deter intruders with its intimidating profile and steel cross sections. Decreased anti-climb pale spacing further dissuades intruders from climbing, and also increases the delay time when attempting to cut or pry through the fence. To increase delay time from a security breach, expanded metal fillers can be positioned between the pales and rails, allowing the facility's security personnel more time to react.

Peripheral Integration

As an added benefit, the Impasse II anti-scale fence system features a rail framework that can integrate multiple perimeter security peripherals, such as intrusion detection systems (IDS) and CCTV communications cable. This helps avoid the budget-breaking cost of patchwork installations.

Proven Performance

The Impasse II anti-scale fence system is an 'Approved Product for Homeland Security' under the Support Anti-terrorism by Fostering Effective Technologies Act (the SAFETY Act).

On your next project, switch to the Impasse II heavy steel palisade anti-scale fence and experience the improvement in perimeter security yourself.


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  • Styles

    Impasse II Styles

    Gauntlet Style Gauntlet Style: The Gauntlet style has high-tensile steel corrugated pales that rise above the upper rail with an outward curve and deny with a triple-pointed splayed spear tip. The outward curved pale discourages attempts to gain access by climbers.

    Trident Style Trident Style: The Trident style is constructed of high-tensile steel corrugated fence pales that rise above the upper rail and restrict with a fierce triple-pointed splayed spear tip. One thing is for sure: the Impasse II palisade fence style serves as an effective visual deterrent.

    Stronghold Style Stronghold Style: At first glance, the Stronghold style may not appear as dangerous with its blunt, slightly rounded tips. However, the Stronghold high-security fence features the same structural configurations and framework of its high-security counterparts.

  • Colors


    This product is available in blackbronze, white or desert sand. Please note that colors vary by computer monitor.

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  • Gates

    Impasse II Gate Options

    TransPort IS Cantilever Sliding Gates TransPort IS: The TransPort IS cantilever sliding gates offer quick, reliable and efficient method for safe and secure vehicle access control at the perimeter's entry point. Click here for the full specifications on TransPort IS gates.


    PassPort IS Gates PassPort IS: The PassPort IS sliding roll gates are fully-welded for enhanced durability and strength. Plus, it features the PermaCoat double coating process for increased weather resistance and reduced corrosion resisting. Click here for the full specifications on PassPort IS gates.


    Swing Gates Swing Gates: Impasse II swing gates are made of 2" x 11 ga. pre-galvanized steel gate ends and rails. The picket measures 2-3/4" x 3/4" x 14 ga. Each swing gate system has 1/4" steel gussets welded at each upright to rail connection, and are balanced with a heavy duty cable and turnbuckle which span across each gate bay. These single and double swing gates help provide a simplistic solution for gaining access to any project.



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  • Integrated Design

    Integrated Design

    The specially formed high-strength architectural shape of the Impasse rail is contoured to carry anti-ram steel cable and/or detection equipment. This helps you consolidate your physical security protection into a single perimeter solution.

    Impasse rail as raceway for wiring Intrusion Detection Systems (IDS): Use the Impasse rail to covertly secure IDS to the security fence.

    The Impasse rail can also easily integrate any intrusion detection sensor. The distinctively shaped Impasse rail conceals IDS cables to delay, deny, deter and detect intruders. Also, the rail features a secure IDS attachment to help keep the sensor cables in place and minimize the number of false alarms. So you can rest assured the Impasse rail will increase the probability of detection.


    Impasse rail as raceway for wiring Conduits: Use the Stalwart's Impasse rail as a conduit tray for electrical conduits. The high cost associated with securing an asset are often overlooked until the last minute. Some of the items used in modern perimeter security systems include lighting, access control wiring, intrusion detection sensor wiring, CCTV cables, communication fiber and electrical wiring.

    As an added benefit, the Impasse rail can house all the components needed to install a perimeter security system. This allows for quicker installation and minimized construction cost from not having to incur the cost of trenching or boring.


    Impasse rail as raceway for wiring. Video and Communications Wiring Use the Impasse rail to carry communication cables along the perimeter.

    The Impasse rail delivers added value with its ability to also incorporate wiring for video, CCTV and other communications. When video and communication systems are installed the probability of detection is higher.


    Impasse Rail with Access Control Access Control Wiring Use the Impasse rail to carry communication cables along the perimeter.

    Access control is a key factor in perimeter security systems. Take advantage of the Impasse rail to carry access control wiring from one entry control point to the next and avoid the burdensome cost of a patchwork design using trenching and boring.


    Impasse with Anti-Ram Barrier Anti-Ram Cable Conceal crash barrier components easily with the Impasse rail.

    The Impasse rail is specially designed to incorporate the cable of the Stalwart anti-ram barrier system. The standard 4 and 5 rail configurations are made to meet the specifications of the Stalwart anti-ram barrier. If need be, the Stalwart anti-ram barrier can be installed into the 4 or 5 rail fence at a later date.

  • Maintenance-Free Coating

    Ameristar's PermaCoat process has a proven track record for high performance. The galvanized base material with dual-layer epoxy and polyester coating delivers a long-lasting, maintenance-free finish.

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  • 15 Year Warranty

    All members of the Impasse family of steel fencing products are manufactured from the highest quality materials by skilled craftsmen to meet the highest standards of workmanship in the industry. This is why we offer a limited 15 year warranty on all members of the Impasse family.

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  • SAFETY Act Certified

    U.S. Department of Homeland SecurityAmeristar manufactures the only fence and barrier products certified under the SAFETY Act by the U.S. Department of Homeland Security. Read more about the SAFETY Act now.

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