[Greenbuilding] removing paper facing from (new) fiberglass batts?

[J Daglish]

Scandanavia vented attic construction with low density batts it is
common to put one layer of batts then a air membrane, another layer of
insulation offset (joints not lined up) to reduce convection currents
and thermal bypass. This should be common good practice !

Regards

John Daglish
Paris, France
John Daglish
Paris, France


2017-02-04 14:10 GMT+01:00 Norbert Senf <norbert.senf at gmail.com>:
> Not sure why you would want to punch holes, assuming that you had a proper
> vapor barrier in place at the right location in the assembly.
> When using multiple layers of ceramic fiber insulation in commercial bake
> ovens, we have learned that it is good practice to sandwich foil in there,
> to break up the convection currents that happen internally at  high
> temperature differentials. I'd guess that something similar happens in
> fiberglass even at lower delta T's..........Norbert
>
> On Sat, Feb 4, 2017 at 2:18 AM, Reuben Deumling <9watts at gmail.com> wrote:
>>
>> My local supplier of fiberglass batts has only faced batts in the sizes
>> I'm looking for (R19 x 23"). I've removed the paper from
>> batts-that-are-being-repurposed but not from new-in-the-box ones. Are there
>> tricks or tools for accomplishing this with a minimum of frustration?
>> The reason I want to do this is so I can run the batts perpendicular to
>> each other, half of them vertical between rafters (unfaced) and the other
>> half horizontal between purlins attached with hurricane ties to the rafters
>> (faced).
>> Or would it be just as good to install the faced batts and then poke a
>> bunch of holes in the paper before adding the second layer?
>>
>> Thanks very much.
>>
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>
>
>
>
> --
> Norbert Senf
> Masonry Stove Builders
> 25 Brouse Road, RR 5
> Shawville Québec J0X 2Y0
> 819.647.5092
> www.heatkit.com
>
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