Should I ground my metal roof?
The myth and the reality
Lightning strikes the tallest, most connected path to ground in an area, not the shiniest material. A metal roof is noncombustible, so if it is struck it will not ignite the way wood shakes can, and the charge spreads across the panels. That is why the metal roofing industry points out that metal roofs do not raise strike risk.
When grounding does come into play
- Full lightning protection. If you want protection, it is a complete system: air terminals along the ridge, heavy conductors, multiple ground rods, and bonding to the home's electrical grounding, designed to NFPA 780 and installed by a certified lightning protection installer. A single wire clipped to a panel and run to one rod is not a lightning protection system and can give false confidence.
- Solar and rooftop equipment. Racking and modules must be bonded and grounded under the National Electrical Code. Your solar installer and electrician handle that.
- Wiring near the roof. A frayed service drop or an attic wire touching the metal deck or panels could energize them. That is an electrician's job to check.
Practical steps
Ask your electrician to confirm your service grounding and surge protection, which protect electronics far more often than anything on the roof. If you live on an exposed ridge in North Georgia's mountains or have tall trees cut back near the house, consider a professional lightning protection evaluation. Keep any existing lightning conductors reconnected after roof work.
For the bigger picture on metal, read metal roofing in Georgia, and if solar is in your plans, see replacing your roof before solar.