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Which holds up better over time: felt or synthetic underlayment?

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skier18
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I’ve noticed the same thing with felt—if it’s humid or there’s a storm, it just falls apart way too fast. Synthetics are definitely more durable, but I’ve had crews complain about how slippery some brands get, especially in the early morning. I’m curious if anyone’s tried those newer “walkable” synthetics and actually found a difference? For now, I just budget extra time to get shingles on quick, but weather doesn’t always cooperate...


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karens96
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Synthetics are definitely more durable, but I’ve had crews complain about how slippery some brands get, especially in the early morning.

Yeah, those slick synthetics can turn a roof into a skating rink before the sun’s up. I’ve seen more than a few guys do the “morning slide.” Honestly, though, I still lean synthetic for longevity—felt just gives up at the first sign of humidity around here. The walkable stuff helps, but it’s not magic. At least you’re budgeting extra time... Mother Nature’s got her own schedule, as usual.


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beekeeper97
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I’ve had both on my house over the years—old-school felt back in the day, and then synthetic when we re-roofed a few years ago. I’ll admit, the synthetic’s holding up better so far, especially with all the humidity and storms we get here in the Southeast. But that slipperiness is no joke; I watched my neighbor’s roofer nearly end up in his azaleas one chilly morning.

Has anyone noticed if certain brands are less slick than others? I’m wondering if it’s more about which product you pick than just “felt vs synthetic.” Also, for folks in colder or wetter areas, does felt ever hold up long-term? Around here it just curls up and tears after a couple seasons, but maybe it’s different out West or up North. Curious if climate makes a bigger difference than material sometimes...


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- Definitely hear you on the slipperiness—synthetic can be like ice, especially early mornings.
-

“I watched my neighbor’s roofer nearly end up in his azaleas one chilly morning.”
Seen that happen more than once... some brands do have a grittier texture, but it’s hit or miss.
- In humid climates, felt just doesn’t last. Up north, where it’s drier and colder, I’ve seen 30# felt hold up decently under metal roofs, but it still can’t touch synthetic for longevity.
- Climate really does play a big role. Material matters, but if you’re in the Southeast with all that moisture, synthetic’s usually the safer bet—even with the slip risk.
- Appreciate your point about brands—worth checking samples in person if you can. Some are definitely less slick than others.


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