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insulation between drywall and studs

2003 Views 0 Replies 1 Participant Last post by  CNM Design
Hi all
Adding 2x2s to 2x4s on outside walls for six inch no kraft paper insulation.
Can I use fan board insulation between drywall and studs for vapor barrier and a sound and heat transmission break?
If so, will this add a little R value? Coast not a factor.
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