Curious, did you ever try any of those “peel-and-stick” underlayments as a backup? I’ve heard mixed things, especially with all the ice dams we get around here.
I’ve used peel-and-stick underlayment on a couple of projects, mostly in valleys and along eaves where ice dams are a real problem. It definitely helps as a secondary barrier, but I’ve noticed that if the deck isn’t perfectly clean and dry, adhesion can be hit or miss. Have you noticed any issues with deck-mounted seals shifting over time, especially after a few freeze-thaw cycles? That’s the one thing that’s kept me leaning toward traditional flashing.
- Definitely get where you’re coming from—freeze-thaw cycles mess with everything up here.
- I’ve seen deck-mounted seals shift a bit, especially on older roofs or if installers rush the prep.
- Traditional flashing feels more forgiving, but those newer seals are getting better each year.
- You’re not being overly cautious sticking with what’s worked for you—no shame in that.
I’ve had my fair share of “surprise” leaks thanks to those wild freeze-thaw swings—nothing like waking up to a drip in the attic to start your Monday. I manage a couple of older duplexes with roofs that are, let’s just say, seasoned. We tried those deck-mounted seals on one property last year because the installer swore up and down they’d hold up better than traditional flashing. Fast forward through one winter and... well, let’s just say I spent more time up on a ladder than I did in my own bed. The seals shifted just enough to let water sneak in, and once things thawed, we had a nice little waterfall in the mudroom.
Honestly, I’m not totally against the new stuff—when it works, it’s slick and the install is way faster. But with these old roofs and our rollercoaster weather, I’d rather stick with tried-and-true flashing, even if it means a little more upfront hassle. The guys who do my maintenance are more comfortable with it, and I sleep better knowing we’re not gambling on something that might not survive another polar vortex.
That said, I’ve seen some newer builds where the deck-mounted seals seem to be holding up fine. Maybe it’s just the combo of old shingles and a roof pitch that’s more “gentle hill” than “mountain slope” that makes mine tricky. Or maybe I’m just cursed with roofs that like to keep me humble.
If you’ve got a newer roof or you’re working with installers who really know their stuff, maybe the seals are worth a shot. For me, though, I’ll take the extra peace of mind—even if it means spending a bit more and listening to the crew grumble about “doing things the old way.” At least I’m not mopping up puddles every spring... well, not as many, anyway.
- Totally get where you’re coming from—old roofs and wild weather are a tough combo.
- I’ve had better luck with traditional flashing too, especially on anything built before the 90s. The newer seals just don’t seem to flex enough when the roof shifts or settles.
- One thing I noticed: if your shingles are already curling or brittle, those deck-mounted seals never really sit right. Ended up with a slow leak in my laundry room last year... not fun.
- For newer roofs, I’ve seen the seals work fine, but I’m with you—peace of mind is worth a little extra hassle and cost.
- Maintenance crews always grumble about “old school” methods, but at least they know how to fix it if something goes sideways.
- Gotta say, I was skeptical about the deck-mounted seals too, but after helping a neighbor install them on his 2015 roof, I changed my mind a bit. No leaks after two years, even through some nasty windstorms.
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That’s fair—old shingles are a pain no matter what you use. But for folks with newer roofs (less than 10 years), those seals can actually save a ton of install time and mess.“if your shingles are already curling or brittle, those deck-mounted seals never really sit right. Ended up with a slow leak in my laundry room last year... not fun.”
- Traditional flashing is tried and true, but it’s also more invasive. Had to patch up a couple of spots where the installer over-cut the shingles—ended up with more potential leak points than I wanted.
- If you’re worried about shifting, maybe check if your roof decking is solid and not spongy. That seems to make a bigger difference than the seal type in my experience.
- Not saying one’s always better than the other, just that the new stuff isn’t all hype—sometimes it really does work out, especially if you’re not dealing with an ancient roof.
