across ceiling joists and then down 12 feet to a generator. I live in a town of 50,000 and it may or may not be union labor
PVC is not allowed by code for a gas line. It is too easy to break, from an earthquake or other physical abuse. You need to use black iron pipe or the newer flexible pipe systems that have become available. The cost depends upon local labor conditions and how difficult the attic access may be, but a ballpark price might be $1000.
