R-VALUE: 39.5, SUITABLE FOR: new construction, retrofit.THERMAL PERFORMANCE: Used in this system, cellulose (at R-3.5 per in.) yields an overall value of R-39.5.PROS:• Continuously protected air barrier keeps wall cavity dry.• Large moisture-storage capacity allows wall to dry gradually.• During retrofits, interior walls can remain intact.CONS:• Unconventional framing can increase production time and labor costs.• Increases the gross building area by 3%.