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Old 12-19-2009, 10:52 AM   #1
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ripped vapor barrier?


I have a few areas in my attic where insulation was cut and pieced around cables running laterally through wall framing. Can I just tape the kraft paper facing with some sort of tape, or do I need to rip out the insulation and install a single piece with the insulation side cut to accommodate the wiring? I would prefer to not waste so much insulation if I can help it. If I can tape it, what kind of tape to use? packing tape maybe?

Thanks.

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Old 12-19-2009, 01:53 PM   #2
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ripped vapor barrier?


The vapor barrier must be on the warm side during the winter. This is the part you cannot see in an attic. If this insulation has paper facing towards the roof, it is wrong anyway. Either remove the paper of slice many cuts in all of it.

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Old 12-19-2009, 02:22 PM   #3
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ripped vapor barrier?


Sorry. Sometimes I don't give enough information. I am finishing this attic out, to have finished storage space, and hopefully one day, more living space. The insulation is on the kneel walls supporting the long side of the gabled roof (which will be a cathedral ceiling in the future, and is insulated as well). So the kraft paper will be right behind the finished layer of drywall on the walls, and from what I understand, will need to act as the warm side vapor barrier, since I live in New England. So that being said, can I just tape the kraft paper "joint", where the insulation was cut for the wires? I assume I can, because the condition is no different from batts butting up lengthwise in cathedral ceiling rafter insulation, right?

Thanks in advance for your reply
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Old 12-19-2009, 02:33 PM   #4
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ripped vapor barrier?


yes then in this case just tape the joints and any tears. Duct tape is good to use
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Old 12-19-2009, 03:04 PM   #5
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ripped vapor barrier?


"Should the joints be taped?
Johns Manville does not recommend nor require that the joints be taped. Vapor retarders
are area weighted. The small gaps would not allow a significant amount of water vapor
through the wall, ceiling or floor. From: http://www.insulating-products.com/p...lation_FAQ.pdf

Very important that the facing is right against the drywall: http://oikos.com/library/insulating_...lls/index.html

Remember under the knee wall for draft stops: http://www.homeenergy.org/archive/he...95/950309.html

Do a good job: http://www.homeenergy.org/archive/he...99/991110.html

Be safe, Gary
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