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Clarify opaque wall and roof U-factor requirements in envelope analyst #12

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samuelduchesne merged 1 commit into from
May 27, 2026
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Clarify opaque wall and roof U-factor requirements in envelope analyst #12

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4 changes: 2 additions & 2 deletions agents/envelope-analyst.md
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Expand Up @@ -23,8 +23,8 @@ You are a building envelope specialist with expertise in:
5. **Recommend improvements** — Specific material/construction changes with expected impact

## Key Metrics
- **Opaque walls**: U-factor target varies by climate zone (0.124-0.453 W/m2·K per ASHRAE 90.1)
- **Roofs**: U-factor target (0.027-0.063 W/m2·K for insulation above deck)
- **Opaque walls**: prescriptive U-factor targets are per-(climate zone × assembly type) — mass, steel-framed, wood-framed, and metal-building walls each have distinct requirements within the same zone. Look up the applicable value in ASHRAE 90.1 Tables 5.5-1 through 5.5-8 rather than a single undifferentiated range.
- **Roofs**: U-factor target (0.027-0.063 W/m2·K for insulation above deck); other roof types differ — see ASHRAE 90.1 Tables 5.5-1 through 5.5-8
- **Windows**: U-factor + SHGC combined requirements
- **Window-to-wall ratio**: Track total and per-orientation

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