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Posted by Mike Paulsen on May 27, 2007, 11:16 pm
M wrote:
>> M wrote:
>>> I am putting up insulation and I have a knee wall of sorts in my attic.
>>> There will be insulation on the partial cathedral ceiling. My question
>>> is on the backside of the kneewall... on the opposite side of the vapor
>>> barrier... this will be the cold side but will also be an attic. Can I
>>> cover the insulation with something so that it isn't hanging loose?
>>> plywood? firring strips or straps?
>> Tyvek.
>>
>>
>
> tyvek won't act as a double vapor barrier in this case?
>
>
It shouldn't - it's not a vapor barrier. In fact, in an attic space you
may want something with a lower perm rating so less vapor is driven into
the wall from the attic side. Tyvek is ~60. There are other products
down in the 5 - 10 perm range. (Products with a perm rating <1 are
considered vapor barriers. 4mil poly is rated at .8 perm)
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