I get where you’re coming from on the price—synthetic underlayment isn’t cheap, especially if you’re covering a big roof. But honestly, I’d be more concerned about the environmental impact than just longevity or cost. Most synthetics are petroleum-based and don’t break down, so when they eventually get torn off, they’re headed straight for landfill. Felt’s not perfect either, but at least it’s got a bit less plastic in the mix.
As for durability, I’ve seen some synthetics hold up great in wild weather, but like you said, others get brittle or even start to curl after a couple of years in direct sun. It really does seem to depend on the brand and maybe even the batch. I’ve had better luck with higher-end products that have UV inhibitors built in, but then you’re paying even more.
If you’re looking for something that’ll last and is a bit greener, there are recycled-content felts and even some newer underlayments made from plant fibers. They’re not as common yet, but worth keeping an eye on if you care about what happens to your roof after it comes off.
If you’re looking for something that’ll last and is a bit greener, there are recycled-content felts and even some newer underlayments made from plant fibers.
That’s a good point—those plant-based underlayments are starting to show up in my area too, though I haven’t seen many installed yet. One thing I’d add: even with synthetics, installation quality makes a huge difference. I’ve inspected roofs where the underlayment was top-tier but staples were used instead of cap fasteners, and it failed early anyway. In wild weather zones, that detail really matters.
installation quality makes a huge difference. I’ve inspected roofs where the underlayment was top-tier but staples were used instead of cap fasteners, and it failed early anyway.
That’s spot on. I’ve seen the same thing—doesn’t matter how “green” or high-tech the material is if it’s not put down right. Had a neighbor go with recycled felt last year, but their crew rushed it and skipped the caps. First big windstorm, half of it peeled up. Around here (coastal Maine), weather finds every weak spot. I’m curious about those plant-fiber options too, but only if the installer knows their stuff.
I hear you on the install making or breaking it. I tried a plant-fiber underlayment a couple years back—looked great on paper, but the crew didn’t follow the spec and just used whatever fasteners they had. Next nor’easter, I was chasing pieces down the street. Material’s only half the battle, especially with these Maine winds.
That’s exactly what worries me—no matter how good the material is, if the crew cuts corners, you’re sunk. I’ve been looking at synthetic underlayments, but I’m not sure if they’re any better for wind. Has anyone actually seen a difference in performance between felt and synthetic after a bad storm?