Fishing Electrical Wire Through Walls

The best advice for fishing wires through insulation is “Avoid it if you can.” The potential is always there to damage the vapor barrier or bunch up insulation, leaving cold spots in the wall. If you must fish wires through exterior walls, the best tip is to avoid spinning the flex bit until you make solid contact with the wood you plan to drill through. If you drill too early, you'll end up creating a large insulation cotton candy cone, which will make retrieving your bit difficult, if not impossible.  

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