We had something similar done on our house about two years ago—metal panels meeting asphalt shingles. Honestly, I was worried about the same thing you're mentioning. Our installer used some kind of flexible flashing or sealant where the two materials meet to handle expansion and contraction. So far, no issues even after some pretty intense temperature swings. Definitely worth asking your installer about their approach though... peace of mind goes a long way.
"Our installer used some kind of flexible flashing or sealant where the two materials meet to handle expansion and contraction."
That's exactly the right approach. Usually, a high-quality flexible flashing like EPDM or butyl tape works best—sealants alone can degrade over time. Proper overlap and secure fastening are also key to long-term durability. Sounds like your installer knew their stuff.
I've had mixed luck with flexible flashings alone, to be honest. Even EPDM flashing can get brittle after years of harsh sun exposure or extreme cold cycles. Last year, I ended up redoing a section where the original installer relied only on tape—water found its way in eventually. Now I pair flexible flashing with a metal drip edge or counter-flashing for extra protection, and it's held up really well so far... Just something to consider if your weather gets intense.
Yeah, flexible flashing alone can definitely be hit or miss. When I moved into my first house, the previous owner had relied solely on EPDM flashing around the chimney. Looked fine at first glance, but after a particularly nasty winter—tons of ice dams and freeze-thaw cycles—I noticed water stains forming inside. Ended up adding metal counter-flashing over the EPDM, and it's been solid since. Seems like combining materials is key if you're dealing with harsh weather... at least from what I've experienced.
Yeah, EPDM alone can be tricky—seen it fail more times than I'd like. Did you check if the original flashing was properly adhered or just slapped on? Metal counter-flashing usually does the trick, but curious if anyone's tried copper... heard good things, but pricey.
