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Old 04-28-2008, 08:44 AM   #1
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Vapour Barrier Patching?


I have added in electrical boxes/wiring and some blocking in the walls for mounting my central vac.

I have cut the vapour barrier in the center of the walls studs and across the stud spacing to allow the vapour barrier to fall down to remove install and add blocking ect.

What is the best/proper way to re-seal these joints?

a. Acoustical cauliking the existing poly on the wall then overlap a new sheet with min. 12" on either sides then use tulk tape to seal the edges? Is 1 bead of caulking good or should I use 2 or more?

b. Just use tulk tape to seal the edges of the new sheet overlapped by min. 12"?

c. Just tape the seems with tulk tape and not add a new overlapped sheet?



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Old 04-28-2008, 10:04 AM   #2
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Vapour Barrier Patching?

You're overthinking this waaaaaay too much.

Caulk certainly isn't necessary. Depending on what type of vapor barrier it is, just use the appropriate tape to re-seal the cut locations. Overlap if you want to. Tyvek tape is nice and sticky, and works well for this application on poly or Tyvek vapor barriers.

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Old 04-28-2008, 02:34 PM   #3
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Vapour Barrier Patching?

I'm using a 6mil poly vapor barrier (tyvek is used on the exterior of the sheathing in our geographic location for moisture barrier)

From what I have read and from builders/contractors saying about using acoustical caulking around electrical boxs and wiring ect. I thought because these holes are huge compared to a small pinhole in a electrical box that I would have to use tape/caulking and large overlaps?

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Old 04-29-2008, 12:00 PM   #4
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Vapour Barrier Patching?

[quote=thekctermite;119603]You're overthinking this waaaaaay too much.

That's a True statement. Just duct tape the seam and move on.
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