For critical areas—valleys, eaves, low slopes—I’d say it’s money well spent. For a basic gable in a mild climate, maybe not necessary.
That lines up with what I’ve seen. My neighbor used self-adhered on his low-slope addition and it held up way better than the rest of his roof after a windstorm last spring. I’m curious if anyone’s noticed any issues with long-term adhesion or wrinkling, especially in hot climates? I’ve heard mixed things about how they age compared to synthetics.
- Seen self-adhered wrinkle up in direct sun—especially on south-facing slopes.
- In my (humid) area, it sticks well but can get kinda gooey after a few summers.
- Synthetics seem to age slower, but I’ve pulled up 10-year-old self-adhered that still had bite.
- If you’re eco-minded, those synthetics aren’t exactly landfill-friendly... just sayin’.
- For hot climates, I’d probably stick with the lighter colors if you can find ‘em.
Synthetics seem to age slower, but I’ve pulled up 10-year-old self-adhered that still had bite.
That lines up with what I’ve seen—sometimes the self-adhered stuff surprises you. I’ve come across roofs where it’s still hanging on after a decade, even if it looked rough around the edges. But yeah, direct sun is brutal. South slopes especially... I’ve seen more than a few jobs where the underlayment looked like a raisin under those shingles. Still, I get the eco concerns with synthetics. It’s a trade-off, no perfect answer. Good call on lighter colors for heat—makes a difference, even if it’s just a few degrees.
I’ve pulled up old synthetics that were still decent, but I’m not convinced they always outlast the self-adhered stuff. In my area (lots of sun, hot summers), the self-adhered seems to hold up better under shingles—less curling and cracking. But yeah, the environmental side nags at me too. I guess it’s just picking your poison... nothing’s perfect, especially if you’re on a south-facing slope.
I hear you on the south-facing slopes—those get brutal. In my experience, self-adhered underlayments do seem to handle the heat and UV better, especially when you’re dealing with a lot of direct sun. Synthetics can last, but I’ve seen them get brittle or start to curl if they’re exposed too long before shingles go on. The environmental impact is a tough one, though... not much out there that’s both tough and green. If you’re worried about longevity under harsh sun, I’d lean self-adhered, but yeah, it’s always a trade-off.