That worry never really goes away, honestly. I’ve inspected a lot of older roofs after bad storms, and even with the newer seals, the weak link is almost always some odd dip or uneven spot. On a relatively smooth roof like yours, deck-mounted seals usually hold up just fine—provided they’re installed right and checked after big weather swings. If you ever start seeing granule loss or soft spots around those mounts, that’s when I’d get extra cautious. And yeah, on anything with “character,” traditional flashing is usually safer in the long run. Those little quirks can surprise you when water finds a path.
- Deck-mounted seals are tempting for the price and speed. I get it—less labor, less mess, and they look cleaner on a new-ish roof.
- But I keep coming back to this point from above:
That’s what worries me, especially since my roof isn’t perfectly flat (thanks, 90s builder shortcuts).“the weak link is almost always some odd dip or uneven spot.”
- Traditional flashing costs a bit more upfront, but it’s a known quantity. I’ve patched enough leaks around “innovative” products to be a little skeptical of anything that skips metal.
- For me, the deciding factors:
- Roof age: If you’re under 10 years and the deck’s solid, deck-mounts might be fine.
- Budget: Deck-mounts are cheaper, but water damage is expensive.
- DIY vs. pro: Flashing is trickier to install right, but worth it if you’re paying for labor anyway.
- I went with flashing on my last install. No regrets, even though it added a few hundred bucks. Peace of mind is worth something, especially when you’re watching every dollar.
- If you do go deck-mount, just keep an eye out after big storms—granule loss or soft spots can sneak up on you.
I get the hesitation with skipping metal, but honestly, I’ve seen deck-mounts hold up just fine on a few jobs—especially on newer roofs with decent sheathing. My uncle’s place had them for five years now, no leaks, and he’s in a pretty rainy area. I think a lot comes down to how careful you are sealing everything, not just the product itself. Flashing is solid, but sometimes it’s overkill if your roof’s still in good shape.
I get where you’re coming from, but I’m still a little nervous about skipping metal flashing. My neighbor did deck-mounts on his asphalt roof and it was fine for a couple years, then he had a slow leak that took forever to track down. Maybe it’s just bad luck, but I’d rather overdo it than end up patching drywall later... especially with all the rain we get here.
Totally get that hesitation—water finds the weirdest ways in, especially when you think you’ve sealed everything up. I’ve seen a few deck-mount installs go sideways after a couple years too, and tracking down those leaks is a pain (and usually not cheap). With all the rain we get, I’d probably lean toward traditional flashing too, just for peace of mind. Sometimes “overdoing it” is just being smart, especially if you’re managing multiple properties or don’t want to deal with callbacks later.