Steel Stud Parapet “New Pups.”— Large backer rod supporting a bunch of extra membrane that lets things move when they have to move. The “Zen” approach to membrane movement. Use a more dimensionally stable membrane and then let things move when they have to. Again, notice the continuity of the control layers.
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%.