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Opaque Envelope Wall Basis of Design (BOD)
Dry Reveal ACM/MCM with Rigid Insulation and Metal Stud Back-up
IBC 2021 & IECC 2021 + MA Stretch Energy Code
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Overview
Performance
| Rigid Continuous Insulation – IECC 2021 + MA Stretch Energy Code (Climate Zone 5, All Other Use) | ||||||
| Code (IECC 2021 + MA Stretch*) | Proposed Base | Proposed Optimized | ||||
| R-Value | U-Factor | R-Value | U-Factor | R-Value | U-Factor | |
| Roofs | ||||||
| Insulation Entirely Above Roof Deck | R-30ci | U-0.032 | R-30ci | U-0.032 | R-45ci | U-0.022 |
| Walls Above Grade | ||||||
| Metal Framed | R-13+ R-10ci | U-0.055 | R-19.ci | U-0.050** | R-19+ R-19ci | U-0.036** |
| Slab-On-Grade Floors | ||||||
| Unheated Slabs | R-15ci | F-0.52 | R-15ci | F-0.52 | R-15ci | F-0.52 |
| Vertical Fenestration | ||||||
| Fixed | NA | U-0.36 | U-0.30* | NA | U-0.29 | NA | U-0.24 |
| Operable | NA | U-0.45 | U-0.32* | NA | U-0.30 | NA | U-0.30 |
| * MA specific requirement. ** U-Factor includes clear field thermal derating as required by IECC 2021 Section C402.1.3. and MA Stretch Energy Code Section C402.7. | ||||||
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