|Interior Finish (vapor permeable)||-||-|
|Interior Gypsum Board (Type X)||-||-|
|Metal Stud (18 GA. Min. @16” O.C.)||-||-|
|Stud Cavity Insulation (Optional)||Dow||2" Styrofoam CM-2045 SPF|
|Exterior Gypsum Sheathing*||-||-|
|Self Adhered Air/Water/Vapor Barrier**||Carlisle||705 FR-A|
|Continuous Insulation**||Dow||2 1/2" Styrofoam Ultra XPS|
* For a 1 hour fire rating change Exterior Gypsum Sheathing to Fire Rated Exterior Gypsum Sheathing.
** Product recommendations are based on Type I-IV construction requiring NFPA 285 assembly acceptance criteria compliance per IBC 2015 Sections 1403.5 & 2603.5.5.
*** Note that specific conditions are required at the head detail of fenestration openings to maintain NFPA 285 compliance.
(proposed clear wall U-Factors are approximately 8% | 30% better than code and have 93% | 82% thermal effectiveness)
|Design R-Value: a||R-13 + R-7.5ci||R-14ci | R-12.8 + R-14ci|
|Total R-Value:||N/A||R-18.78 | R-31.58|
|Effective R-Value:c||N/A||R-17.43 | R-25.75|
|Design U-Factor: a, b||U-0.064||U-0.059 | U-0.045|
|Effective U-Factor: c||N/A||U-0.057 | U-0.039|
|Assembly Air Permeability||0.04 cfm/ft2 @75Pa||0.0014 cfm/ft2 @75Pa|
a Clear wall meets energy code thermal requirements without stud cavity insulation.
b Clear wall U-Factor is based on the stud size & spacing noted above and is calculated per IECC 2015 & ASHRAE 90.1-2013 Appendix A.
c Clear wall effective thermal performance is based on the stud size & spacing noted above, manufacturer literature and industry studies on the thermal performance of facades.