At a guess 10 to 15 years. Last year we had both drop wires ripped off - both were wall fixed, one using ordinary screws and plus and the other with an expansion bolt. The force ripped the expansion bolt out of the hole! Had they been fascia fixed I can imagine the damage that would have occurred.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ M H C
Cable ties or tape are not needed. The steel wire has the cable wrapped around and forms a secure fixing - there are millions in service and they work.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ M H C
Interesting that one.
Our line was originally aluminium - fixed to facia board.
Replaced by copper - fixed to facia board.
The they decided that the length was too long and replaced from their pole to electricity pole then to - yep, facia board.
All over the past 35 years!
If the old fixing is ok, engineers often reuse it, but an expansion bolt is better.
For a start, you don't get the problem in this thread, as when wood is replaced with PVC fascia, the overhead cable is not effected.
An expansion bolt can pull out, if the force of the cable is more or less inline with the bolt, better at 45 degrees.
Fixing in PVC is not a good idea, as it's not as well fixed to the roof as wooden ones.