1) Use an electrician metal fish tape. The fish tape will more than likely break apart and puncture a hole in the vapor barrier and some of the wall insulation will also come off. Unfortunately, there is no other choice when fishing a vapor barrier insulated wall. This occurs all of the time and is not a big deal if puncturing the vapor barrier or even pulling some of the insulation apart.
2) If concerned about puncturing the vapor barrier and/or removing a small portion of the wall insulation when fishing, then the only other choice is to remove a portion of the wall covering and that is seldom done in the industry.
3) If the wall covering remains in place, it is impossible to re-seal vapor barrier that is inside a drywall and it is not a big deal.
4) Fishing an insulated wall takes much time and patience. Not the easiest task to perform by no means:)
5) Having an un-sealed portion of the wall stud cavity area is not a deal breaker. The cavity area where you will fish the wall is still protected by the left and right side wall studs and the wall covering. There will still be plenty of barrier plastic and insulation inside the wall cavity area. Puncturing the vapor barrier and/or any portion of the insulation will not even be noticeable.
If you have any additional questions, just let me know and I’ll be glad to answer them for you.
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