Join Date: Jan 2007
Location: Home of the Hawkeyes
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If a straight run with rigid PVC is possible up to the attic, that would be a preferred method. 3/4" flex in short sections coupled together is the last resort. You want to search for Carlon Resi Gard flex conduit, in a diameter of at least 1.25". Usually comes in 50' sections or longer. Splices are nothing but potential trouble, not only for separation, but for creating another ridge for your wire pulling to hang up on. A 3/4" ID pathway won't hold much, 4 cat 5's or a couple of RG6 coax, much more and you risk damaging things during installation.
The most important thing to remember when routing your conduit run is to avoid having more than 3 bends before a breakout point. 4 bends or more and you create so much friction, it will very difficult to pull cabling in without exceeding its pulling tension limits and compromising its performance. Wire pulling lubricant will help, but avoiding bends is the safest way to ensure your future pathway is truly usable.
If you seal up the open ends of your conduits with a small ball of insulation and some electrical tape, it will greatly reduce the cold air infiltration.
If your flex conduit doesn't come with a pre-installed pull string, a vacuum cleaner and "mouse" made of some plastic sheeting with a pull string tied on can make the job far easier.