I had hot temperatures in mind. I have a corrugated iron* roof, facing
South, and a standard extension lead that I ran along touching the
underside melted and stuck at each place where it touched. Luckily, it
wasn't connected to a supply at the time.
Cold, IIUC, only affects the flexibility - which possibly won't be a
problem for the OP in this case.
* It had got very rusty and painting it with black "bitumen" didn't help
with the temperatures..
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