Fiber Cement Cladding with XPS Ultra Continuous Insulation & Metal Stud Backup






 Interior Finish (vapor permeable)--
 Interior Gypsum Board (Type X) -
 Metal Stud (18 GA. Min. @16” O.C.)- -
 Stud Cavity Insulation (Optional)Dow2" Styrofoam CM-2030 SPF
 Exterior Gypsum Sheathing* - -
 Self Adhered Air/Water/Vapor Barrier**Carlisle705 FR-A
 Continuous Insulation**Dow3" Styrofoam Ultra XPS
 Cladding Attachment System**Knight WallHCI System
 Fiber Cement Cladding**SVKColormat

* For a 1 hour fire rating change Exterior Gypsum Sheathing to Fire Rated Exterior Gypsum Sheathing.

** Product recommendations are based on Type I-V construction not requiring NFPA 285 assembly acceptance criteria compliance.

Assembly Performance:

(proposed clear wall U-Factors are approximately 19% | 38% better than code and have 95% | 74% thermal effectiveness)

  Clear Wall

Code Minimum
(IECC 2015 - Metal Framed)


Design R-Value: aR-13 + R-7.5ciR-16.8ci  |  R-12.8 + R-16.8ci
Total R-Value:N/AR-21.23  |  R-34.03
Effective R-Value:cN/AR-20.07  |  R-25.19
Design U-Factor: a, bU-0.064U-0.052  |  U-0.040
Effective U-Factor: cN/AU-0.050  |  U-0.040
Assembly Air Permeability0.04 cfm/ft2 @75Pa0.0014 cfm/ft2 @75Pa

Clear wall meets energy code thermal requirements without stud cavity insulation.

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.

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.


Click here to download a complete copy of this opaque wall Basis of Design package