That’s spot on about the metal shavings—seen that mistake way too often. I’ve also noticed some crews rush the underlayment step, thinking the panels will cover any sins. Ever run into issues where a bad underlayment job caused leaks even with “premium” panels?
Ever run into issues where a bad underlayment job caused leaks even with “premium” panels?
- Seen it more than once. Doesn’t matter how fancy the panels are if the underlayment’s wrinkled, torn, or just plain missing in spots.
- Had a place last winter—brand new standing seam, but water was tracking right through the valleys. Turns out the crew skipped ice & water shield at the eaves. Panels looked perfect, but the ceiling was trashed.
- I’m always skeptical when someone says “the panels will hide it.” They might hide it, but they sure won’t fix it.
Curious—anyone ever see synthetic underlayment fail, or is it mostly the old felt that causes grief?
- Had a synthetic underlayment peel up at the ridge once after a windstorm—wasn’t installed tight enough, I guess. Water got in, but not as bad as with felt.
- Honestly, I’ve seen both types fail, but usually it’s the install, not the material.
- One thing I wonder: do folks here ever double up on underlayment in hail-prone spots, or is that overkill?
Doubling up underlayment isn’t as wild an idea as it sounds, especially if you’re in a spot that gets hammered by hail every year. I’ve seen some crews overlap two layers of synthetic or do a synthetic over felt combo on tricky valleys or low slopes—just for peace of mind. It’s not code everywhere, but where the weather’s rough, I get why people do it.
But yeah, like you said, most of the failures I’ve seen were from loose install, not the material itself. Had a neighbor’s roof where the underlayment bunched up at the ridge after a thunderstorm—installer rushed it and didn’t fasten enough. Water got in, but their insurance still blamed “improper installation.” Kind of a wake-up call for me to pay extra attention to those details.
If you’re already spending for better metal panels, I don’t think an extra layer is overkill. Just makes the whole system more forgiving if something shifts or gets dinged.
If you’re already spending for better metal panels, I don’t think an extra layer is overkill. Just makes the whole system more forgiving if something shifts or gets dinged.
I doubled up on synthetic underlayment after a hailstorm shredded my neighbor’s roof last spring. Noticed it really helped with noise too—less drumming during storms. It’s not cheap, but after seeing water stains in my attic from a single missed fastener, I’m convinced it’s worth it. Proper install matters way more than the brand, honestly.
