Khalim Conn-Kowlessar 1821f3fef3 Slice 27: round BS EN ISO 13370 floor U to 2 d.p. per RdSAP10 §5.12 ... Spec text (RdSAP 10 §5.12, p.46): "Unless provided by the assessor the floor U-value is calculated according to BS EN ISO 13370 using its area (A) and exposed perimeter (P) and rounded to two decimal places." Our u_floor returned the raw formula output — that's a 0.0040 W/m²K precision gap vs the PDF that was costing 0.03–0.13 W/K on §3 LINE_33 for 4 fixtures. §3 LINE_33 residuals collapsed: 000474: 0.0296 → 0.0032 000477: 0.1246 → 0.0013 000480: 0.0168 → 0.0075 000490: 0.0282 → 0.0013 000516: 0.0038 → 0.0038 (exposed floor, Table 20 — unaffected) 000487: 37.88 (RR defect, slice 25) +3 SapResult pin closures (000474/477/490 ECF now pass at abs=1e-4). Pin counts: section_cascade 151/35 unchanged (residuals shrunk but still > 1e-4); e2e SapResult 24→27 PASS. Remaining LINE_33 0.001–0.0075 W/K is wall + party-wall area precision — PDF stores 2-d.p.-rounded element areas (slice 27b). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-05-23 08:50:33 +00:00
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adr	docs: handover for Table 3c two-profile combi loss → close 4 Elmhurst fixtures	2026-05-22 12:14:00 +00:00
sap-spec	Slice 27: round BS EN ISO 13370 floor U to 2 d.p. per RdSAP10 §5.12	2026-05-23 08:50:33 +00:00