I hear you on the Midwest winters—bio-felt just doesn’t cut it once that deep freeze sets in. Synthetics have held up better for me, too. Anyone seen how these eco-options handle hail or big spring storms? That’s where I see most failures around here.
Anyone seen how these eco-options handle hail or big spring storms? That’s where I see most failures around here.
I’ve inspected a few roofs after those classic Midwest hailstorms, and honestly, the eco-felt options just don’t inspire much confidence. Synthetics tend to resist tearing and water intrusion better, at least in my experience. I’ve seen bio-felt start to break down or even wick moisture after a couple of big storms—especially if there’s any delay in shingle replacement. Not saying synthetics are perfect, but they seem to limp across the finish line a bit less battered.
I get where you’re coming from, but I’ve actually had a different experience with some of the newer eco-felt products. On a couple of my properties, they held up surprisingly well after last year’s hail—no more curling or water spots than the synthetics we used elsewhere. Maybe it’s a brand thing, or just luck with installation? I do agree, though, if you leave them exposed too long, they’re not as forgiving. But I wouldn’t write them off completely, especially if you’re trying to meet local green building codes.
That’s interesting—maybe I just got unlucky with my batch of eco-felt, or maybe the installer was having an off day. I will say, the stuff did fine until we had a week of sideways rain, then it started looking sad. But you’re right, for green codes it’s hard to beat. Has anyone tried mixing underlayments on one roof? Like, felt in the valleys and synthetic elsewhere? Wondering if that’s a recipe for disaster or just overthinking it...
- Mixing underlayments isn’t unheard of, but it’s not usually recommended unless there’s a specific reason (like code or a tricky valley).
- Valleys do take a beating, so extra protection there makes sense. Just gotta watch for compatibility—some synthetics and felts don’t play nice together, especially if moisture gets trapped.
- I’ve seen a few roofs with mixed materials hold up fine, but it really comes down to install quality and local weather.
- Honestly, you’re not overthinking it—sideways rain will test any system. If you’re worried, maybe ask your roofer about ice & water shield in the valleys instead.
- Don’t feel bad about the eco-felt—sometimes it’s just a rough batch or weird weather. Happens more than folks admit.
