From 8fb317b1f5cd658358154388e778e5ecf5aa9bbe Mon Sep 17 00:00:00 2001 From: Claude Date: Wed, 27 May 2026 12:16:05 +0000 Subject: [PATCH] =?UTF-8?q?Clarify=20ASHRAE=2090.1=20wall=20U-factors=20ar?= =?UTF-8?q?e=20per-(climate=20zone=20=C3=97=20assembly)?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The single wall U-factor range conflated distinct construction classes (mass / steel-framed / wood-framed / metal-building) that have materially different prescriptive requirements. Defer the lookup to ASHRAE 90.1 Tables 5.5-1 through 5.5-8. Closes #8 https://claude.ai/code/session_01N3KLKaWtVxjoNtzVGQ8jkQ --- agents/envelope-analyst.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/agents/envelope-analyst.md b/agents/envelope-analyst.md index 3062781..87b352e 100644 --- a/agents/envelope-analyst.md +++ b/agents/envelope-analyst.md @@ -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