that's not why. but you are right about wrapping it onto your facia.
wrap the ice guard on to your facia and nail the gutter to the ice
shield. try to keep the gutter down below the shingle's edges (don't
allow the shingles to lap onto the gutter straps (hangers, spikes or
what ever, including screens, if possible) . wal-la, the best that can
be done. you don't need to fuss with adhering it to plywood. you don't
even have to fuss with adhering to your facia. been there done that
the bottom line. the water SHOULD never reach that point (plywood
sheathing) regardless, sticking it down or not sticking it down. but
that's not how it always goes, even in a perfect world.
Yabbut, his first layer will be a dimensional roof, very convoluted compared to
your typical 3-tab. They don't usually take well to a roof-over. Also, the
problem with the I&W shield sticking to the decking(then trying to tear it off
20 years from now) is the OP's main beef. Tom
Work at your leisure!
So tell me why nailing down felt is somehow not a problem, but try to
suggest nailing down the Ice/Water membrane and all of a sudden it's a
different story. ???
And why does I/W needs to be adhered to the edges, when felt doesn't
(because it can't)? If felt doesn't have a peel-and-stick backing,
and if you'd suggest it in place of I/W, then why can't I get away
with nailing I/W and NOT using it's sticky part?
In other words, just because the I/W membrane has a sticky backing why
does that mean I have to USE the sticky backing? The I/W membrane is
a membrane NOT BECAUSE OF THE STICKY BACKING. It's special because of
what it's made of - not because it has a sticky backing. The sticky
backing does not make it work better. I think the membrane part is
great! I think the sticky backing is for SHIT because of what it
means for re-roofing later.
I'll bet it takes less time to take an I/W membrane, LEAVE THE RELEASE
SHEET ON, unroll it and position it, and then nail it. Vs taking the
release sheet off and wrestling with it while it's all sticky and
trying to get it into position. Come on - nailing it down should be
no more difficult than if it was felt.
Yes- these are single-tab shingles, and I'm looking at a weight of 300
lbs per square (vs 215 lbs for your average 3-tab).
Yes. I guess it wouldn't be so bad if in 20 years when I take the
shingles off that they release easily from the I/W shield so that
basically the shield could stay put on the roof and I just throw new
shingles over them. But if the shield needs to come off, then I
SHOULDN'T HAVE TO TEAR UP THE PLYWOOD when I'm at it.
I have yet to hear a clear technical reason why these I/W membranes
have a sticky underside that essentially glues them to the wood deck.
They don't need that in order to act as an I/W membrane to keep water
from getting to the deck by backing up under the shingles.
All I can imagine (and hear some people observing) that the sticky
part of these I/W membranes are bad news when it comes time to
re-roof. Lots of down-side to the sticky back-side, and no up-side.
I'm thinking the sticky backside is all for product liability reasons
and not for technical / performance reasons.
I beleive the sticky backing does need to be there. on the front edge of the
roof it seals itself to the edge of the plywood to prevent any water or ice
from getting to the wood. with out it being sticky. water or ice could easily
get under it at the edge
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