R-VALUE: 44.0, SUITABLE FOR: new construction.THERMAL PERFORMANCE: Insulated with cellulose: R-36.0. Insulated with high-performance fiberglass (R-4.5 per in.): R-44.0.PROS:• Optional 2x3 insulated wall and high-efficency fiberglass give potential for even higher R-values.• Large capacity for moisture storage allows the wall cavity to dry gradually.CONS:• Panels are often manufactured off site, trucked to site, and craned into place, which all add to cost.• Design may be subject to joist ...
R-VALUE: 40.0, SUITABLE FOR: new construction, retrofitTHERMAL PERFORMANCE: At R-3.5 per in., the cellulose in this system yields an overall value of R-40.PROS:• Familiar building process means lower labor costs with readily available materials.• If cellulose is used, the project has a lower environmental impact.• Large moisture-storage capacity allows wall cavities to dry gradually.CONS:• Fairly involved insulation process can add to labor costs.• Reduces interior space by 3%.
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%.
The technique involves laying two beads of mortar, followed by filing the insulation cavity in the middle (here it is filled with sawdust mixed with lime). Then the cordwood is set in the mortar beads. This provides an insulation R-value of 1.5 per inch of wall. A 16" cordwood wall has an R-value of 24.