Actually, they do. That is very prominent in all of the literature I've read on Z-Wave. It isn't considered a weak point but a feature.
Not at all. In promoting the mesh RF network concept, Z-Wave manufacturers make a point of explaining this. When you think about it this is actually to their advantage. It encourages people to buy more devices.
That's OK as long as there are no wires running across the highway. The problem is wires are invisible until you get real close.
I heard a story (don't know if it's true or not) about Frankfurt, Germany's ATC being really rude. As the story has it, sometime in the late 40's a US pilot landed his 4-prop airliner, crossed the hold short line and stopped to check the airport chart (the taxiways were something of a maze at the time).
An angry ground controller barked, "American Boeing ######! Vat are you do-ink"?
Pilot: "Ah, sir, I've stopped my airplane."
ATC: "Vhy haff you shtopped your airplane zair"?
Pilot: "Ah, sir, I'm checking the chart to see how to get top the ramp."
ATC: "Haff you neffer been to Frankfurt before???"
Pilot: "Ah, yes sir. We came by several times in '42 but we didn;t stop."
The price is the same here no matter which material you choose. The major cost is the tile. The new surface is less flammable (I think it's fiberglass and something else) than tar and felt. AFAIK, the latter is pretty noxious stuff when it burns but that didn't enter into the choice of material for me. The new stuff supposedly lasts longer. At $40,000 for a replacement job, I want this stuff to outlast me. :^)
I'd be a little skeptical of that information if I were you. The biggest problem is moisture from precipitation coming through -- not moisture accumulating underneath. In fact, if the attic moisture barrier above the ceiling is properly installed there really shouldn't be a condensation issue for the wood beneath the roof.
Heck, by then they will have destroyed the place anyway.
The problem with westerns is that victims always get right up again. It teaches children that there are no real consequences of violence. One amazing thing in this country is that the FCC gets its panties in a knot over a 2-second flash of an aging rock star's bosom but no one even bats an eye over all movies like Matrix and Jurassic Park is considered children's fare. Go figure.