Would you worry about lightning if your house had a metal roof?

I’ll admit, I’m kind of in the “just re-tighten and keep an eye on it” camp, at least for the first go-around. Maybe I’m just cheap, but those screws aren’t exactly free, and crawling around up there swapping every single one is no picnic. If the washers are shot or you see daylight, yeah, swap ’em out. But if it’s just a little loose? Sometimes a quarter turn does the trick… for a while anyway. Guess it depends how much you like climbing ladders!

I get where you’re coming from - nobody wants to swap out every screw unless it’s really needed. But I’ve seen a few jobs where folks just kept tightening and eventually the holes got stripped or the washers started leaking anyway. Sometimes it’s a judgment call, but I’d rather do a little extra now than deal with a leak mid-storm. Speaking of storms, does anyone actually ground their metal roof for lightning, or is that overkill? I’ve heard mixed things, especially in areas with a lot of summer storms.

- Metal roofs and lightning - always a hot topic.
- Technically, the roof isn’t more likely to get struck than anything else, but if it does, the metal actually helps disperse the charge safely.
- Grounding? Most codes don’t require it unless you’re running a full lightning protection system (which is another can of worms).
- Seen a few houses with grounded roofs after some wild storms, but honestly, most folks around here skip it and just make sure everything’s up to code.
- If you’re in “lightning alley,” I might look into it... but for most areas, feels like overkill, kinda like wearing a helmet to check the mail.

I’ve always wondered about this, especially since I’m in the Midwest where we get some pretty wild storms. My place has a standing seam metal roof - put it on about five years ago after hail trashed the old asphalt shingles. I did a lot of reading at the time and kept running into that same point: metal doesn’t actually attract lightning, but if it does get hit, it’s less likely to catch fire than wood or asphalt. That made me feel better, but I still had questions about grounding.

The installer said local code didn’t require grounding unless I was adding a full lightning rod system, which seemed kind of odd to me. I mean, if you’ve got a big sheet of metal up there, wouldn’t you want some way for the electricity to go straight to ground? But then again, maybe that’s just overthinking it. The electrician who checked my panel after install said as long as everything inside is up to code and bonded properly, there’s not much more you can do unless you’re in one of those high-strike areas.

I did hear from a neighbor who had their metal roof grounded after a nearby house took a direct hit and fried half their electronics. But then again, that was right after a freak storm with tornado warnings and all kinds of crazy stuff flying around. Most folks around here just seem to trust the code and hope for the best.

One thing I’m still not clear on: if you do decide to ground the roof (without going full lightning protection system), does that actually reduce risk for your home’s wiring and electronics? Or is it more about protecting the structure itself? Seems like surge protectors inside would be more effective for appliances, but maybe I’m missing something.

Curious if anyone’s run into insurance issues with this too. My policy didn’t mention anything specific about metal roofs or grounding requirements, but I’ve heard some companies ask about it in Florida or Texas. Wondering if that’s just regional or if there’s something else going on with how they assess risk.

Anyway - just trying to figure out if I’m being overly cautious or not cautious enough...

I’ve wondered about this too, especially after a lightning storm last summer that knocked out power on our block. We put a metal roof on our old farmhouse about three years ago - mainly for the hail resistance, like you. I remember asking the installer about grounding and he basically said unless we were adding a full lightning protection system, it wasn’t necessary. He explained that the metal itself isn’t more likely to be struck, and if it is, it spreads the charge out so it’s less likely to start a fire.

I did some digging after that storm, though, because a neighbor’s TV and fridge both got fried. Turns out, grounding the roof alone doesn’t really protect your electronics - it’s more about giving lightning a path to ground if you have rods or air terminals. The surge comes in through wiring or even plumbing, not just the roof. We ended up putting whole-house surge protectors on our panel and using plug-in ones for anything expensive.

Insurance-wise, ours didn’t care about grounding either, but I’ve heard in coastal areas they get pickier. Around here, as long as you’re up to code, they seem fine. I still get a little nervous during big storms, but honestly, I feel better with metal than I did with old shingles.