Not so simple as just pulling the wires through with the old ones.Many wires might travel horizontally through studs and blocking.I just snaked a coax cable through a fiberglass ins wall and had a real tough time trying to use the existing cable to pull my fishtape.It turns out it was located one bay over and run through a stud.wouldn't go.Took a measurement to find out it was on the other side of the stud from where it started.New hole and presto!It would be very difficult to snake down a wall with rigid closed cell spray foam imo.
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SIKSUKR
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