Rainscreen Cladding with DOW THERMAX Wall System & Metal Stud Backup
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Assembly:
Component | Manufacturer | Product |
|
| Interior Finish (vapor permeable) | - | - | |
| Interior Gypsum Board (Type X) | - | - | |
| Metal Stud (18 GA. Min. @16” O.C.) | - | - | |
| Stud Cavity Insulation (Optional)* | Dow | 2" Styrofoam SPF CM-2045 | |
| Continuous Insulation* | Dow | 2" Thermax XArmor | |
| Flashing | Dow | LiquidArmor CM | |
| Cladding Attachment System | Knight Wall | CI System | |
| Rainscreen Cladding* | - | NFPA 285 Compliant | |
* Product recommendations are based on Type I-IV construction requiring NFPA 285 assembly acceptance criteria compliance per IBC 2015 Sections 1403.5 & 2603.5. | |||
Assembly Performance:
(proposed clear wall U-Factors are approximately 2% | 25% better than code and have 91% | 80% thermal effectiveness)
Code Minimum | Proposed | |
| Design R-Value: a | R-13 + R-7.5ci | R-13ci | R-12.8 + R-13ci |
| Total R-Value: | N/A | R-17.09 | R-29.86 |
| Effective R-Value:c | N/A | R-15.56 | R-23.88 |
| Design U-Factor: a, b | U-0.064 | U-0.063 | U-0.048 |
| Effective U-Factor: c | N/A | U-0.064 | U-0.042 |
| Assembly Air Permeability | 0.04 cfm/ft2 @75Pa | 0.01 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. | ||