Khalim Conn-Kowlessar 015144361a Slice 25a: 000487 §3 full closure — RR detailed surfaces + gable_wall_external + roof-area-as-max + half-up rounding ... §3 cascade pins now close at abs=1e-4 for all 6 fixtures (was 5 of 6 with 000487 the holdout). Five spec-grounded changes: 1. SapRoomInRoofSurface gains optional `u_value` override + new kind `gable_wall_external` per RdSAP10 Table 4 (p.22) row 1 (exposed gable, U "as common wall" with assessor-lodged override). Routes to (29a) walls + LINE_31 external area. 2. SapAlternativeWall gains optional `u_value` override — assessor-lodged measured U bypasses the Table 6 cascade. 000487 Ext1 has a 9-mm TimberWallOneLayer at U=1.90 outside the Table 6 buckets. 3. _part_geometry uses MAX of floor areas (not top) for roof area, per RdSAP10 §3.8 (p.20): "Roof area is the greatest of the floor areas on each level". Fixes 000487 Ext1 where ground=7.13 m² > first=5.63. 4. Replace Python `round()` (banker's) with `_round_half_up` for §15 element-area rounding. Banker's rounds 17.125 → 17.12; SAP convention rounds half-up → 17.13. Boundary case appears in 000487 Ext1 party wall area (party_length 6.25 × height 2.74 = 17.125). 5. 000487 fixture lodges 5 detailed RR surfaces (party gable, external gable @ U=0.86, flat ceiling, stud wall, slope), roof_insulation_ thickness=300 (both parts → U=0.14), is_exposed_floor=True on Ext1 floor 0, and u_value=1.90 on the Ext1 alt wall. §3 cascade per-fixture: field | 474 | 477 | 480 | 487 | 490 | 516 LINE_31 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ LINE_33 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ LINE_36 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ LINE_37 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ Scoreboard: section_cascade_pins: 274 → 279 PASS (+5: §3 +4 for 000487, §7 +1 cascade) e2e SapResult: 32 → 32 PASS (unchanged — downstream §8-§12 pins not yet asserted) §4 (000487) deferred to slice 25b — needs has_electric_shower routing through the §4 cascade so Nbath uses the "0.13N+0.19" branch when only electric showers are present. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-05-23 22:32:41 +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 25a: 000487 §3 full closure — RR detailed surfaces + gable_wall_external + roof-area-as-max + half-up rounding	2026-05-23 22:32:41 +00:00