Mounting solar panels: go with traditional flashing or try those newer deck-mounted seals?

- Seen both in action on steep asphalt roofs around Worcester.
- Deck-mounted seals are better than they used to be, but... I still see more callbacks for leaks vs. traditional flashing.
- If your roof gets serious ice dams or wind-driven rain, flashing’s just more forgiving.
- Some newer seals claim to self-heal, but once they’re compromised, you’re tearing up shingles to fix it.
- If you’re handy and don’t mind the extra work, I’d stick with tried-and-true flashing. Peace of mind is worth the hassle, especially up here.

If your roof gets serious ice dams or wind-driven rain, flashing’s just more forgiving.

That’s the thing up here in Worcester - ice dams are basically a winter sport. I’ve watched my neighbor’s deck-mounted seals get tested every February, and let’s just say, the results aren’t always pretty. Had to help him tarp the whole thing last year after a nor’easter decided to make his attic a swimming pool.

I get the appeal of the newer seals - less mess, quicker install, and they look slick. But I’m with you on the “peace of mind” bit. Flashing might be old-school, but it’s like that one friend who always shows up when you need help moving a couch.

Curious if anyone’s tried those “self-healing” seals long term? Do they actually patch themselves up after a rough winter, or is it just marketing magic? I keep seeing ads for them but haven’t met anyone who swears by them yet.

Curious if anyone’s tried those “self-healing” seals long term? Do they actually patch themselves up after a rough winter, or is it just marketing magic?

Seen a few installs with those “self-healing” seals around here (central Mass), but honestly, after two winters, most looked about as healed as my old hockey skates. Maybe they work better in milder climates, but ice dams just chew them up. Flashing’s still the only thing I trust when the snow piles up and starts melting weird.

Had a neighbor down the street go with those self-healing seals last year - looked great at first, but after one nasty freeze-thaw cycle, he was up there patching leaks by spring. I stuck with old-school flashing on my place and haven’t had a drip yet. Maybe we just get too much ice around here for the new stuff to keep up.

Traditional flashing is still my go-to, especially in climates where freeze-thaw is a regular headache. Those self-healing seals sound slick on paper, but I’ve seen way too many fail once the temps swing and the roof starts moving. Metal or rubberized flashing, properly integrated with the shingles, just holds up better over time. Maybe the seals work fine in milder spots, but in areas with heavy ice? I’d play it safe and stick with what’s proven.