Why are "Ice and Water" roof membranes always "peel-and-stick" ???

[sal]

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Nope, common sense over rules here.

where the heck do you think the nails for the shingles go though? so nailing down would not compromise I/W membrane.

the reason you have ice shield is so that the melted water penetrating the roof surface (top layer of shingles) does not reach the decking.

the ice would build up and when the snow/ice continues to melt, the resulting water would never reach the top edge of the I/W, because of the roofs' pitch. The ice dam that is there would also melt as the melting snow. so the water would be carried away over the top of the ice.

my guess again why its has an adhesive backing is. for the ultimate protection. the manufactures doesn't give a rats ass about the guy doing the reroof 20 to 40 years down the road.

you do not need to stick the shit down. the bond is not that good and certainly not strong enough to stop the expansion of ice. which btw is never the problem. the problem is ice on the surface not below the ice shield.

[Matt Whiting]

What common sense?

The membrane is quite flexible and will seal around nails very nicely. Just like having an o-ring.

Yep, you are with the program so far.

The adhesive gives one more layer of protection by keeping any water than happens to get under the shield from migrating between the membrane and the roof sheathing.

If the bond isn't that good, then why are you complaining about the tear-off of this stuff?

Matt

[no]

re read my post. I'm not complaining. also re read, your reply doesn't make sense on certain, if not all points.

but then why bother, you just doing your thing, trolling

[3D Peruna]

Yes...it does. Come and look at my gutters in Minnesota about January and tell me that I don't need my I/W glued to the plywood. Common sense tells me that I should wrap the I&W over the fascia, too, before installing any drip edge, flashing or fascia. Water, in the form of ice, will make its way uphill and can cause all sorts of problems. That's why we want it glued down tight.

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[no]

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.

[John Smith]

???

Walla Walla, Washington? or voilá?

[3D Peruna]

Let me ask you this... if sticking it down doesn't matter, why isn't the stuff sold without the adhesive as an alternative? Some marketing ploy? Lawyers?

I'm still sticking it down on my new house...

[Tom]

3DPeruna wrote:>Let me ask you this... if sticking it down doesn't matter, why isn't the

Bituthane _is_ sticky. Tar _is _sticky. It's the sticky stuff that seals up around nails. Yeesh. Tom Work at your leisure!