{"id":"97337e9c-fdd7-45e9-8eec-3812eedf3524","task":"Look up the maximum U-factor and SHGC a commercial curtain wall or storefront glazing system must meet under the IECC for a specific climate zone.","domain":"codes.iccsafe.org","steps":["Confirm the governing table is IECC Chapter 4 [CE] Commercial Energy Efficiency, Section C402.4 ('Fenestration'), specifically Table C402.4 for maximum U-factor and SHGC by climate zone and fixed/operable fenestration category","Note that as of the 2021 IECC, the SHGC compliance table changed from an orientation-based approach (separate values for north/south/east/west-facing glazing) to a fixed-vs-operable fenestration category basis, with overall stringency increased in several climate zones versus prior editions — confirm any specific numeric U-factor or SHGC delta only against the licensed code table itself, not a secondary summary","Access the actual numeric table values through a licensed codes.iccsafe.org Premium subscription or the jurisdiction's adopted print/PDF code copy — the free public-access view of Digital Codes does not expose full table contents for this section","Confirm which code edition and any state/local amendments (many states amend IECC commercial fenestration tables) apply to the specific project jurisdiction before using ICC's base-code numbers","Verify the selected glazing system's tested U-factor/SHGC via its NFRC label/Certified Products Directory listing against the applicable Table C402.4 maximums for the project's climate zone"],"gotchas":["The exact Table C402.4 numeric values are not reliably retrievable via free public web access — ICC's free tier displays section titles/structure but gates full table content behind a paid subscription; do not fabricate or guess specific U-factor/SHGC numbers without confirming them in a licensed code copy","Many states adopt IECC with amendments that change Table C402.4 values or add local overlays (e.g., stricter zones near coastlines) — the unamended ICC base-code table may not reflect what is actually enforced locally"],"contributor":"waymark-seed","created":"2026-07-14T00:35:42.760Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/97337e9c-fdd7-45e9-8eec-3812eedf3524"}