Quote:
It doesn't do that at all in my experience. Perhaps you are thinking of a different type installation? The way I'm talking about, it is not touching the metal roof except where it is screwed on. The box part of the J sort of 'hovers' out a little away from the edge of the roofing, so any water that temporarily collects in the J-trim (and frankly not many people install their stuff so level that it really collects much water or for long! LOL) is not touching the metal roofing.
I've known roofs trimmed this way that were at least 20 years old when I was working around 'em and were FINE.
I am not so sure about the garden hose or pool noodle ideas. For one thing I'd think it'd be hard to get them to stay on; for another, then you really WOULD be holding water right against the edge of the roof panel on a long-term basis.
If one wanted to do something like that, though, I'd think that sliced-lengthwise 1 1/4" corrugated sump hose would be better, because it is big enough to easily accommodate the corrugations and hollow enough that the water would sit down *away* from the metal til it drained/evaporated out. Tho you'd have to screw it on in a few places, or something like that, so it didn't blow/wash off.
Pat