Re: Miraflex Insulation
It's unclear where you're located.
If you reside in an area with cold winter conditions then the vapor barrier will be placed on the warm side ( room side ) under the drywall before the insulation.
If you reside in the warm climates .... it's common practise to have the vapor barrier applied to outside portion of the wall ( warm side ) .
The Miraflex you are mentioning is the stuff that is encased in a plastic sheeth for ease of handling , reducing the itch factor.
This plastic sheething is not a vapor barrier since it has tiny slits as well the material has a high perm value ... this means moisture will penetrate.
You should consider an appropriate vapor barrier be installed in the proper location for your area.
Hope this helps.
"" an ounce of perception -- a pound of obscure "