What Is A Lightning Rod?
The rod itself is just the first stop — here's what it actually does, and why the rest of the system matters just as much.
The Basic Job of a Lightning Rod
A lightning rod — more precisely called an air terminal — is the component of a lightning protection system that intercepts a strike before it hits the building itself. Mounted at the highest points of a roof, it gives lightning a preferred point of contact, then works with the rest of the system to carry that energy safely away from the structure. On its own, a rod does nothing — it only works because it's connected to a conductor and grounding electrode that give the strike somewhere to go.
How It Redirects the Strike
The rod is made from a highly conductive metal, typically copper or aluminum, chosen because it offers far less resistance to electrical current than the building materials around it. Once it intercepts a strike, the energy travels down a connected conductor rather than through the building's structure, wiring, or occupants, and is released into the ground through a grounding electrode. That path is what actually prevents the fire and structural damage lightning can cause — the rod is the entry point, not the whole solution.
How Systems Are Configured
Depending on the building's size and roof design, a system may use a single rod with a conductor run to ground, multiple rods connected by a network of conductors across the roofline, or — on larger or more complex structures — an interconnected mesh of conductors covering the roof to spread coverage across a wider area. The right configuration depends on the building's height, shape, and how exposed it is to strikes.
Placement and Material
Air terminals are placed on every high point of a structure — ridgelines, chimneys, dormers, even rooftop equipment — since lightning tends to strike the tallest available point. Getting placement right takes an assessment of the whole roof, not just the peak.
Installation in Your Area
RS Lightning Protection installs and services lightning rod systems across Ohio, Pennsylvania, Delaware, Maryland, and West Virginia. Call 1-866-415-2231 to have your property evaluated.
Need components? See our components service.