Seismic Anchoring: Expert Tips from ICCONS & KUSCH for Safe Structural Design

05 March 2025
Seismic Anchoring: Expert Tips from ICCONS & KUSCH for Safe Structural Design
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Successful construction projects depend on the correct selection of anchors and adherence to proper installation practices, particularly in the context of seismic anchoring. ICCONS and KUSCH, a leading seismic engineering consultancy, have partnered to share insights and promote best practices for installing concrete screw anchors, including ICCONS’ Thunderbolt® PRO, in seismic-rated applications.

About KUSCH

KUSCH, founded in 2013 by Chartered Structural Engineer Martin Kusz, specialises in designing resilient and compliant engineering solutions. Their approach emphasises balancing robustness, efficiency, and sustainability, while prioritising safety and practicality. This collaboration combines ICCONS’ focus on product quality and innovation with KUSCH’s technical expertise to provide practical solutions for even the most complex projects.

Thunderbolt® PRO: A Versatile Solution for Seismic Applications

ICCONS’ Thunderbolt® PRO anchors are an ideal solution for securing threaded rod hangers used in mechanical, electrical, and plumbing (MEP) services. Designed for cracked concrete and rated for seismic loads, these anchors offer several advantages over traditional methods like expansion anchors, including:

  • Outstanding performance
  • Anchor Versatility: Head styles, sizes and finishes
  • Comprehensive approvals
  • Faster installation
  • Reduced dust, thanks to smaller-diameter holes


Although these anchors represent significant improvements in efficiency and performance, proper installation remains critical to ensure they perform as specified.

Avoiding Common Installation Errors

In the accompanying video, Gianni from KUSCH outlines key issues that can arise during the installation of concrete screw anchors and offers tips for avoiding them:


  1. Overdriving the Anchor:  Using an impact driver requires caution. For example, the 6mm  Thunderbolt® PRO Screw-Bolt has a maximum torque rating of 250Nm. Exceeding this can lead to overdriving, which risks damaging the concrete or compromising the anchor.
    • Use a driver with torque control or a lower setting.
    • Stop driving immediately when the anchor head contacts the concrete surface.

  2. Incorrect Hole Depth:
    • Shallow holes weaken the anchor’s hold in the concrete.
    • Drill holes 1 to 2 anchor diameters deeper than the specified anchor length.

  3. Worn or Incorrect Drill Bits: Worn drill bits can create undersized holes, increasing installation torque and potentially damaging the anchor. To maintain accuracy, adhere to the following best practices.
    • Regularly inspect and replace worn bits.
    • Use ICCONS’ Raptor drill bits , which feature wear markers to identify when a drill bit has reached the end of its service life.

  4. Improper Angle of Installation: 
    • Anchors installed at an angle other than 90 degrees to the concrete surface may experience bending stresses during tightening, reducing their performance.
    • Always ensure the drill is perpendicular to the surface.

Importance of Proper Installation

Correct installation of seismic-rated anchors ensures they perform as intended under load. When installed properly, ICCONS’ Thunderbolt® PRO anchors provide a reliable, efficient solution for securing threaded rod hangers in seismic environments, delivering both robust performance and impressive load capacities.

Learn More

For more information about ICCONS’ range of construction fastening systems or expert advice on seismic anchoring, watch the video or contact ICCONS® and KUSCH directly.

Note: ICCONS® has taken extreme care in compiling the above information. ICCONS® may change our products at any time as may our competitors. ICCONS® believe the information is true and correct as of the date of this article.