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A 440 mm (>420 mm) solid brick AS-BUILT wall computed U = 1.70 (the 220 mm bucket default) instead of the RdSAP-correct 1.10. The §5.7 Table 13 thickness path only fired for *insulated* brick (external/ internal + thickness > 0); the as-built case fell through to the Table 6 cavity/solid age-band default. Spec: RdSAP 10 Specification (9th June 2025), §5.7 "U-values for uninsulated brick walls, age bands A to E", Table 13 (PDF p.40): ≤200 mm → 2.5, 200–280 mm → 1.7, 280–420 mm → 1.4, >420 mm → 1.1. Table 6 footnote (b) on the "Solid brick as built" row (PDF p.40): "Or from 5.7 if wall thickness is other than 200mm to 280mm" — the thickness table supersedes the flat 1.7 default whenever a documentary wall thickness is lodged (200–280 mm gives 1.7 either way). The §5.8 / Table 14 dry-lining R is added on top only when the wall is dry-lined, per the §5.7 closing sentence. Validated against the user-generated Elmhurst worksheet "simulated case 21" (replica of API cert 2818-3053-3203-2655-9204: mid-terrace, age band B, solid brick as-built 440 mm, room-in-roof). New §3 cascade pin `test_section_3_wall_u_by_thickness_case21_match_pdf` routes the Summary through the real extractor + mapper and pins: (31) 155.1000, (33) 175.6208, (36) 23.2650, (37) 198.8858 — all 1e-4. External walls Main U → 1.1000; Sheltered RR gable → 1/(1/1.10+0.5) = 0.71 (was 0.92). Pinned on §3 only (case-6 precedent): its code-908 instantaneous multi-point gas water heater has a separate §4 (219) gap. Cross-check: sim case 20 (220 mm) stays at 1.70 — unchanged. API SAP accuracy (scripts/eval_api_sap_accuracy.py, 896 computed certs): % |err| < 0.5 SAP vs lodged: 42.6% → 43.8%; mean |err| 2.045 → 2.010. Regression: tests/domain/sap10_calculator/ (1861), backend/ documents_parser/tests/ (574), datatypes/epc/ + rdsap golden fixtures all green (pre-existing test_total_floor_area excepted). pyright strict net-zero. No solid-brick fixture pin shifted (200–280 mm unchanged). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| domain | ||
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| utilities | ||
| __init__.py | ||
| conftest.py | ||
| test_lambda_packaging.py | ||