I went with a single synthetic layer when I replaced my roof last year (asphalt shingles, Houston area). Honestly, the roofer tried to upsell me on double felt, but it just sounded like paying more for future headaches. Haven’t had a single issue yet... and my attic doesn’t feel like a sauna anymore. If you ask me, less is more unless you’re in Alaska or something.
Funny thing, I’ve seen double felt actually trap moisture in Gulf Coast storms—like a soggy sandwich nobody wants. Single synthetic’s been holding up better in my experience, especially with Houston’s humidity. Less is more, unless you like peeling back layers after a storm...
like a soggy sandwich nobody wants
That’s the perfect way to put it. I’ve pulled up double felt after a storm and it’s like unwrapping a wet burrito—never a good sign. Houston humidity just loves to sneak in. Single synthetic’s been my go-to lately too, less mess, less drama.
- Pulled up felt after a rain here in Florida and it was just mush. Not sure how anyone trusts it long-term in humid spots.
- Switched to synthetic last time—way lighter, easier to roll out solo, and didn’t stick to everything.
- Only thing I miss is the price. Felt’s still cheaper, but I’d rather not deal with the mess.
- Curious if anyone’s tried peel-and-stick underlayment? Wondering if it’s overkill for a standard shingle roof or actually worth the extra bucks.
Peel-and-stick’s kind of a love/hate thing for me. I put it on a low-slope section over my porch last year, thinking the extra waterproofing would be worth the extra cash. It was hot as blazes that day, which honestly made it stick almost too well—once it touched plywood, it wasn’t moving. No wrinkles, though, and I haven’t seen a leak yet.
For a full shingle roof, I’m not convinced it’s always necessary unless you’re in a spot that gets hammered by hurricanes or you’ve got a low pitch. It’s pricey and heavy, and if you ever need to tear off shingles for a repair, you’ll probably cuss a bit since that stuff clings like crazy. On the other hand, I get why folks like it for valleys or edges—makes sense as a sort of “belt and suspenders” move.
I’d still take synthetic over felt any day, especially down here where humidity eats felt alive. Peel-and-stick is solid, just maybe not worth it everywhere unless you’re dealing with wild weather or tricky roof angles.
